Like an idiot

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Kurt - 17 Jun 2005 22:03 GMT

Hi,

Like an idiot I went out and got some kevlar thread 10,000 dernier
(whatever that is) Looks strong but not nice as looking as the
300lb. test one can get from Apogee. Supposed to be 400lb test.
I haven't used it as shock cord and I should have posted it before
I bought it. The link is here:
http://www.thethreadexchange.com/miva/merchant.mv?page=TTE/PROD/KEVH/KEV1000TUBE

What does anyone think? Look like it might be satisfactory material.
Well I will find out as I used some with a motor mount mounting in a
G size Super Big Bertha. I may make a secondary shock cord mount with
Epoxy and a kevlar loop on the body tube a' la LOC (like in my Aura) and
attach a secondary parachute. If all goes well, I could disconnect the
secondary shock/parachute at the loop and just use the single main shock
unit that is connected to the motor mount.
Everything is modified with plywood rings and an extra body tube for a
payload bay. It is just apogee deploy with ejection charge and I can
use an adapter for 24mm engines.

Kurt Savegnago

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pratthobbies@rocketryonline.com - 18 Jun 2005 02:46 GMT

You're not an idiot. Be of good cheer.

But also consider why my Kevlar costs more than buying spools of it
through The Thread Exchange; I specced it out for model rocket use. So
does Quest.

I don't have any problem with hunting for a bargain; I love to do it
too. And I've often gotten caught with bargains that turned out not to
be useful for what I had in mind (usually from Harbor Freight, it
seems). I guess it's one way to learn.

400 lb isn't a bad number for model rocket use. Test it and see if it
accepts glue; a drop of Elmer's will keep the knots from coming untied
if the Kevlar isn't coated. If it is coated, swage the loops. The
coated Kevlar will come untied no matter how tight the knot is, given
enough time.

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Kurt - 18 Jun 2005 18:19 GMT

> You're not an idiot. Be of good cheer.
>
[quoted text clipped - 12 lines]
> coated Kevlar will come untied no matter how tight the knot is, given
> enough time.

Hi,

It is three thick strand but not shiney like the apogee product.
I think it will be O.K. but Will us a backup on the Super Big B
modified.

Kurt Savegnago

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Greg Heilers - 18 Jun 2005 21:21 GMT

>> You're not an idiot. Be of good cheer.
>>
[quoted text clipped - 20 lines]
>
> Kurt Savegnago

Awhile back, I purchased some "sight unseen". It was thinner than I
expected. I simply use three pieces, hand-braided together, to give
it some "heft".

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Kurt - 20 Jun 2005 09:38 GMT

>>>You're not an idiot. Be of good cheer.
>>>
[quoted text clipped - 24 lines]
> expected. I simply use three pieces, hand-braided together, to give
> it some "heft".

Tried it in a Richter Wrecker and it worked O.K. Used two 36inch
surplus chutes from Aerocon. One tangled but got the ship back fine.
I think the booster tube was crinkled by the thrust of the D engines
as the descent rate was reasonably slow. Will cut the tube and epoxy
a coupler. The tube feels a little thin past the engine mount and
may have suffered from the hibachi effect and burned.

Kurt

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Greg Cisko - 27 Jun 2005 14:10 GMT

> Hi,
>
> Like an idiot I went out and got some kevlar thread 10,000 dernier
> (whatever that is) Looks strong but not nice as looking as the
> 300lb. test one can get from Apogee. Supposed to be 400lb test.

The thread is OK If you loop it around a few times to make a 2-3 inch
loop, and use it to connect a nylon strap tubing shock chord to your
rocket body. I use epoxy and it is bullet proof.

Signature

gcisko@hotmail.com

> I haven't used it as shock cord and I should have posted it before
> I bought it. The link is here:
[quoted text clipped - 12 lines]
>
> Kurt Savegnago

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Model Forum / General / Rockets / June 2005

Like an idiot