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


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