Date   
moderated Re: Kevlar shock cord

Tom Augustyn
 

I have a good idea of what your talking about, thanks again!


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 12:26 pm
Subject: Re: [MTMA] Kevlar shock cord

I’ve tried a method of making the Kevlar shock cord replaceable on model rockets. The method works well but is a little difficult to explain in an email. Basically, You poke a through-hole in each of the centering rings large enough to pass a carpet needle through. Then take your Kevlar and tie a small loop in one end, put the loop around the motor hook and using the needle, pass the free end from the rear up through the holes and into the body tube. 

You have to make the Kevlar long enough to reach from the very aftmost portion of the rocket all the way to its final desired length, but if it gets toasted and weak, you can easily pull it out and replace it. 

Jeff

On Sep 9, 2019, at 12:16 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Great info, thanks!


-----Original Message-----
From: Bob Ferrante <robert.1.ferrante@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 11:43 am
Subject: Re: [MTMA] Kevlar shock cord

One thing that must be considered with Kevlar is degradation.  100 pound line may work the first three flights but if the shock cord is close to the ejection charge then each time it is being exposed to the ejection charge it does degrade.  After a few flights your 100 pound line is now 75 pound line, and a few more 50 pound line or less. Also Kevlar will breakdown in UV light (sunlight). The strength is significantly reduced over time exposure to sunlight.  I passed on a bunch of Kevlar at NARAM this year because it had changed color on the reel from the UV breaking down the Kevlar. Several layers in had changed color because the vendor kept the reels on the back of his trailer and where constantly exposed to sunlight.

Funny thing is I purchased 150 pound and 500 pound from Emmakites right after NARAM.  I have had the web address in my favorites since NARAM-53.   www.emmakites.com

Experience has told many of us that it is better to overbuild the shock cord.

100 pound is good for small competition models and sport models up to B or C.  
250 pound is good for models up to E or F or egglofters.

Because Kevlar is so strong you may find it breaks parts on the model.  So a short section of elastic line run in parallel with the Kevlar to absorb some shock before the Kevlar line pulls tight with reduce the shock to the parts of the rocket.  This is great for egglofters and TARC teams to know.

Bob Ferrante


On Mon, Sep 9, 2019 at 11:14 AM Jeff Kodysz <jeffk813@...> wrote:
Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Jeff Kodysz
 

I’ve tried a method of making the Kevlar shock cord replaceable on model rockets. The method works well but is a little difficult to explain in an email. Basically, You poke a through-hole in each of the centering rings large enough to pass a carpet needle through. Then take your Kevlar and tie a small loop in one end, put the loop around the motor hook and using the needle, pass the free end from the rear up through the holes and into the body tube. 

You have to make the Kevlar long enough to reach from the very aftmost portion of the rocket all the way to its final desired length, but if it gets toasted and weak, you can easily pull it out and replace it. 

Jeff

On Sep 9, 2019, at 12:16 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Great info, thanks!


-----Original Message-----
From: Bob Ferrante <robert.1.ferrante@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 11:43 am
Subject: Re: [MTMA] Kevlar shock cord

One thing that must be considered with Kevlar is degradation.  100 pound line may work the first three flights but if the shock cord is close to the ejection charge then each time it is being exposed to the ejection charge it does degrade.  After a few flights your 100 pound line is now 75 pound line, and a few more 50 pound line or less. Also Kevlar will breakdown in UV light (sunlight). The strength is significantly reduced over time exposure to sunlight.  I passed on a bunch of Kevlar at NARAM this year because it had changed color on the reel from the UV breaking down the Kevlar. Several layers in had changed color because the vendor kept the reels on the back of his trailer and where constantly exposed to sunlight.

Funny thing is I purchased 150 pound and 500 pound from Emmakites right after NARAM.  I have had the web address in my favorites since NARAM-53.   www.emmakites.com

Experience has told many of us that it is better to overbuild the shock cord.

100 pound is good for small competition models and sport models up to B or C.  
250 pound is good for models up to E or F or egglofters.

Because Kevlar is so strong you may find it breaks parts on the model.  So a short section of elastic line run in parallel with the Kevlar to absorb some shock before the Kevlar line pulls tight with reduce the shock to the parts of the rocket.  This is great for egglofters and TARC teams to know.

Bob Ferrante


On Mon, Sep 9, 2019 at 11:14 AM Jeff Kodysz <jeffk813@...> wrote:
Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Tom Augustyn
 

Great info, thanks!


-----Original Message-----
From: Bob Ferrante <robert.1.ferrante@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 11:43 am
Subject: Re: [MTMA] Kevlar shock cord

One thing that must be considered with Kevlar is degradation.  100 pound line may work the first three flights but if the shock cord is close to the ejection charge then each time it is being exposed to the ejection charge it does degrade.  After a few flights your 100 pound line is now 75 pound line, and a few more 50 pound line or less. Also Kevlar will breakdown in UV light (sunlight). The strength is significantly reduced over time exposure to sunlight.  I passed on a bunch of Kevlar at NARAM this year because it had changed color on the reel from the UV breaking down the Kevlar. Several layers in had changed color because the vendor kept the reels on the back of his trailer and where constantly exposed to sunlight.

Funny thing is I purchased 150 pound and 500 pound from Emmakites right after NARAM.  I have had the web address in my favorites since NARAM-53.   www.emmakites.com

Experience has told many of us that it is better to overbuild the shock cord.

100 pound is good for small competition models and sport models up to B or C.  
250 pound is good for models up to E or F or egglofters.

Because Kevlar is so strong you may find it breaks parts on the model.  So a short section of elastic line run in parallel with the Kevlar to absorb some shock before the Kevlar line pulls tight with reduce the shock to the parts of the rocket.  This is great for egglofters and TARC teams to know.

Bob Ferrante


On Mon, Sep 9, 2019 at 11:14 AM Jeff Kodysz <jeffk813@...> wrote:
Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Tom Augustyn
 

Thanks!


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 11:14 am
Subject: Re: [MTMA] Kevlar shock cord

Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Bob Ferrante
 

One thing that must be considered with Kevlar is degradation.  100 pound line may work the first three flights but if the shock cord is close to the ejection charge then each time it is being exposed to the ejection charge it does degrade.  After a few flights your 100 pound line is now 75 pound line, and a few more 50 pound line or less. Also Kevlar will breakdown in UV light (sunlight). The strength is significantly reduced over time exposure to sunlight.  I passed on a bunch of Kevlar at NARAM this year because it had changed color on the reel from the UV breaking down the Kevlar. Several layers in had changed color because the vendor kept the reels on the back of his trailer and where constantly exposed to sunlight.

Funny thing is I purchased 150 pound and 500 pound from Emmakites right after NARAM.  I have had the web address in my favorites since NARAM-53.   www.emmakites.com

Experience has told many of us that it is better to overbuild the shock cord.

100 pound is good for small competition models and sport models up to B or C.  
250 pound is good for models up to E or F or egglofters.

Because Kevlar is so strong you may find it breaks parts on the model.  So a short section of elastic line run in parallel with the Kevlar to absorb some shock before the Kevlar line pulls tight with reduce the shock to the parts of the rocket.  This is great for egglofters and TARC teams to know.

Bob Ferrante


On Mon, Sep 9, 2019 at 11:14 AM Jeff Kodysz <jeffk813@...> wrote:
Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Jeff Kodysz
 

Yes, but Kevlar is excessively strong for its diameter. 100 pound test Kevlar is like carpet thread. 

On Sep 9, 2019, at 11:10 AM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Tom Augustyn
 

Okay but what about the actual size of the kevlar cord? Wouldn't heavier pound ratings have more braids and be thicker?


-----Original Message-----
From: Jeff Kodysz <jeffk813@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 9:06 am
Subject: Re: [MTMA] Kevlar shock cord

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER


--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Jeff Kodysz
 

Think about it this way... if it's rated to #100, you could attach a 99 pound weight to the body tube and pick the rocket up by the nosecone with the weight attached. The rocket itself would fail long before the kevlar would break.

The only thing to worry about is zippering, but if you make the cord long enough that's not a problem. You could also secure as small piece of silicone model aircraft fuel tubing to the cord where it touches the open end of the body tube. 

Jeff

On Mon, Sep 9, 2019 at 9:02 AM Tom Augustyn via Groups.Io <taugy=aol.com@groups.io> wrote:
For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER



--
Jeff Kodysz
President
Mantua Township Missile Agency
NAR Section #606


moderated Re: Kevlar shock cord

Tom Augustyn
 

For all body tube sizes?


-----Original Message-----
From: John Ulizzi <jaulizzi@...>
To: main <main@mtma.groups.io>
Sent: Mon, Sep 9, 2019 8:49 am
Subject: Re: [MTMA] Kevlar shock cord

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER

moderated Re: Kevlar shock cord

John Ulizzi
 

Just my two cents but I have used the 100# on model rockets and never had a failure of the kevlar. I have had the swivels pulled apart, which to me is an even greater testament to the strength of the 100#...

They are both very good...

John


On Sep 8, 2019, at 10:20 PM, Tom Augustyn via Groups.Io <taugy@...> wrote:

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER

moderated Re: Kevlar shock cord

Tom Augustyn
 

Thanks Wolf! I was actually looking for a source for this exact product!


-----Original Message-----
From: Wolfram v.Kiparski <astronwolf@...>
To: main <main@MTMA.groups.io>
Sent: Sun, Sep 8, 2019 7:51 pm
Subject: [MTMA] Kevlar shock cord

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER

moderated Kevlar shock cord

Wolfram v.Kiparski
 

Here's an inexpensive source for kevlar shock cord.  I always replace the rubber shock cords that come in Estes kits with this stuff.  The 250 lb. test line is perfect for model rockets, packs well, and is easy to handle.
https://www.amazon.com/emma-kites-Braided-Creative-Projects/dp/B01850OSRW?ref_=Oct_RAsinC_Ajax_3473351_0&pf_rd_r=1VCH1S3KH6J3CC9RMP0Q&pf_rd_p=b86fab73-bcd1-5ac8-9680-864dd2068659&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=3473351&pf_rd_m=ATVPDKIKX0DER

moderated Re: We are GO for launch tomorrow #go

Jeff Kodysz
 

Sorry to hear that Ken. Please send her our best wishes. 

Jeff

On Aug 23, 2019, at 10:02 PM, Ken Hubal <hubalken@...> wrote:

Have fun! We won't be able to make it; Barb is recovering from a very serious infection.

On Fri, Aug 23, 2019, 9:39 PM Wolfram v.Kiparski <astronwolf@...> wrote:
Ben and Nathan will get to fly in the morning.  I know your schedule.  No worries.

On Fri, Aug 23, 2019, 5:36 PM Jeff Kodysz <jeffk813@...> wrote:
I'm certainly sorry that you weren't aware that this was a cub scout launch day. As I mentioned, it ordinarily wouldn't even be a full club launch as it's the fourth Saturday in August, but we added it on so the scouts could launch. We do this twice every year with two different packs and it's usually close to this time in August. 

That said, I don't see a problem with Ben and Nathan intermixing their flights with the other kids' flights. There should be 31 kids coming and generally they include little brothers and sisters too. I'm sure everyone will get to fly plenty tomorrow. :)

One additional note for tomorrow. Due to the pretty constant flow of young people at the launch area, we will need to insist that your prep work be done by the parking area and that you bring up your rockets only when they're prepped for flight. This is to ensure that everyone is safe, and everyone is free to move in any direction should anything go wrong. Too many people at the launch site makes it very difficult for those of us in charge to watch out for everyone's safety. 

Jeff

On Fri, Aug 23, 2019 at 5:10 PM Jennifer Davis <jhercik@...> wrote:
Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Jim Seibyl
 

Hope Barb is ok, thoughts for a speedy recovery.

gheem

“We need more boom.”

On Aug 23, 2019, at 10:02 PM, Ken Hubal <hubalken@...> wrote:

Have fun! We won't be able to make it; Barb is recovering from a very serious infection.

On Fri, Aug 23, 2019, 9:39 PM Wolfram v.Kiparski <astronwolf@...> wrote:
Ben and Nathan will get to fly in the morning.  I know your schedule.  No worries.

On Fri, Aug 23, 2019, 5:36 PM Jeff Kodysz <jeffk813@...> wrote:
I'm certainly sorry that you weren't aware that this was a cub scout launch day. As I mentioned, it ordinarily wouldn't even be a full club launch as it's the fourth Saturday in August, but we added it on so the scouts could launch. We do this twice every year with two different packs and it's usually close to this time in August. 

That said, I don't see a problem with Ben and Nathan intermixing their flights with the other kids' flights. There should be 31 kids coming and generally they include little brothers and sisters too. I'm sure everyone will get to fly plenty tomorrow. :)

One additional note for tomorrow. Due to the pretty constant flow of young people at the launch area, we will need to insist that your prep work be done by the parking area and that you bring up your rockets only when they're prepped for flight. This is to ensure that everyone is safe, and everyone is free to move in any direction should anything go wrong. Too many people at the launch site makes it very difficult for those of us in charge to watch out for everyone's safety. 

Jeff

On Fri, Aug 23, 2019 at 5:10 PM Jennifer Davis <jhercik@...> wrote:
Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Ken Hubal
 

Have fun! We won't be able to make it; Barb is recovering from a very serious infection.


On Fri, Aug 23, 2019, 9:39 PM Wolfram v.Kiparski <astronwolf@...> wrote:
Ben and Nathan will get to fly in the morning.  I know your schedule.  No worries.

On Fri, Aug 23, 2019, 5:36 PM Jeff Kodysz <jeffk813@...> wrote:
I'm certainly sorry that you weren't aware that this was a cub scout launch day. As I mentioned, it ordinarily wouldn't even be a full club launch as it's the fourth Saturday in August, but we added it on so the scouts could launch. We do this twice every year with two different packs and it's usually close to this time in August. 

That said, I don't see a problem with Ben and Nathan intermixing their flights with the other kids' flights. There should be 31 kids coming and generally they include little brothers and sisters too. I'm sure everyone will get to fly plenty tomorrow. :)

One additional note for tomorrow. Due to the pretty constant flow of young people at the launch area, we will need to insist that your prep work be done by the parking area and that you bring up your rockets only when they're prepped for flight. This is to ensure that everyone is safe, and everyone is free to move in any direction should anything go wrong. Too many people at the launch site makes it very difficult for those of us in charge to watch out for everyone's safety. 

Jeff

On Fri, Aug 23, 2019 at 5:10 PM Jennifer Davis <jhercik@...> wrote:
Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Wolfram v.Kiparski
 

Ben and Nathan will get to fly in the morning.  I know your schedule.  No worries.


On Fri, Aug 23, 2019, 5:36 PM Jeff Kodysz <jeffk813@...> wrote:
I'm certainly sorry that you weren't aware that this was a cub scout launch day. As I mentioned, it ordinarily wouldn't even be a full club launch as it's the fourth Saturday in August, but we added it on so the scouts could launch. We do this twice every year with two different packs and it's usually close to this time in August. 

That said, I don't see a problem with Ben and Nathan intermixing their flights with the other kids' flights. There should be 31 kids coming and generally they include little brothers and sisters too. I'm sure everyone will get to fly plenty tomorrow. :)

One additional note for tomorrow. Due to the pretty constant flow of young people at the launch area, we will need to insist that your prep work be done by the parking area and that you bring up your rockets only when they're prepped for flight. This is to ensure that everyone is safe, and everyone is free to move in any direction should anything go wrong. Too many people at the launch site makes it very difficult for those of us in charge to watch out for everyone's safety. 

Jeff

On Fri, Aug 23, 2019 at 5:10 PM Jennifer Davis <jhercik@...> wrote:
Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Jeff Kodysz
 

I'm certainly sorry that you weren't aware that this was a cub scout launch day. As I mentioned, it ordinarily wouldn't even be a full club launch as it's the fourth Saturday in August, but we added it on so the scouts could launch. We do this twice every year with two different packs and it's usually close to this time in August. 

That said, I don't see a problem with Ben and Nathan intermixing their flights with the other kids' flights. There should be 31 kids coming and generally they include little brothers and sisters too. I'm sure everyone will get to fly plenty tomorrow. :)

One additional note for tomorrow. Due to the pretty constant flow of young people at the launch area, we will need to insist that your prep work be done by the parking area and that you bring up your rockets only when they're prepped for flight. This is to ensure that everyone is safe, and everyone is free to move in any direction should anything go wrong. Too many people at the launch site makes it very difficult for those of us in charge to watch out for everyone's safety. 

Jeff

On Fri, Aug 23, 2019 at 5:10 PM Jennifer Davis <jhercik@...> wrote:
Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Jennifer Davis
 

Ben and Nathan will be happy to have other kids at the launch. 

I hope my kids will get to launch too since we only have the morning time to be there and we didn’t know until today that the plans for the launch were changed. Maybe we could know with more time in the future?

On Aug 23, 2019, at 4:50 PM, Jeff Kodysz <jeffk813@...> wrote:

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Jeff Kodysz
 

Hi Jennifer,

It's likely to be pretty busy, but there may be openings in the rush of kiddo launches that will allow others to launch. There's no rule that says you can't launch, but the little ones have priority until they're all done for the day.

Jeff

On Fri, Aug 23, 2019 at 4:37 PM Jennifer Davis <jhercik@...> wrote:
Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff

moderated Re: We are GO for launch tomorrow #go

Jennifer Davis
 

Are only cub scouts allowed to launch the first few hours? 


On Aug 23, 2019, at 3:37 PM, Jeff Kodysz <jeffk813@...> wrote:

Tomorrow's scheduled launch is a GO! This would normally be a members only, bring your own gear launch, but we are hosting Cub Scout Pack #67 for their rocket day activities, so the club gear will be there and the first couple of hours we will have youngsters launching their rockets. After that it's open to the public, per standard club rules.

If anyone would like to assist with the Cubs, please come out and bring your own rockets to fly, They are usually done by noon and the rest of the afternoon is ours, and it's supposed to be gorgeous!

See you at the field!

Jeff