Anybody ever use Edmund Scientific's kevlar?

Anybody ever use Edmund Scientific's kevlar?

Post by Rockmanz » Sun, 26 Apr 1998 04:00:00



Hi all,
Was talking to a friend of mine the other night and he said that he flew with
Bob Alway (Peter's brother) and said that he used kevlar from Edmund. I looked
in my Edmund catalog and sure enough there it was a spool of 600 yrds. for
$19.95 I went to the Edmund site and posted a question to them as to the
diameter and tinsle stength. Well the reply came back in a .bin file and I have
no idea to read it. Has anyone else used this kevlar before. If so, were you
satisfied with it? Was it small thread that needed to be braided into a thicker
cord?


NAR#71556 SR-Insured     Mid South Rocketry Society# 0035-SR.    IAR #123
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Anybody ever use Edmund Scientific's kevlar?

Post by Bob Kapl » Mon, 27 Apr 1998 04:00:00


Quote:

> Was talking to a friend of mine the other night and he said that he flew with
> Bob Alway (Peter's brother) and said that he used kevlar from Edmund. I looked
> in my Edmund catalog and sure enough there it was a spool of 600 yrds. for
> $19.95 I went to the Edmund site and posted a question to them as to the
> diameter and tinsle stength. Well the reply came back in a .bin file and I have
> no idea to read it. Has anyone else used this kevlar before. If so, were you
> satisfied with it? Was it small thread that needed to be braided into a thicker
> cord?

It's shroud line weight material, although it could be used as shock cord
(or aprtJpart of it) in very small rockets like 10-13mm competition models.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html
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Anybody ever use Edmund Scientific's kevlar?

Post by Attican1 » Tue, 28 Apr 1998 04:00:00


Quote:

>Hi all,
>Was talking to a friend of mine the other night and he said that he flew with
>Bob Alway (Peter's brother) and said that he used kevlar from Edmund. I
>looked
>in my Edmund catalog and sure enough there it was a spool of 600 yrds. for
>$19.95 I went to the Edmund site and posted a question to them as to the
>diameter and tinsle stength. Well the reply came back in a .bin file and I
>have
>no idea to read it. Has anyone else used this kevlar before. If so, were you
>satisfied with it? Was it small thread that needed to be braided into a
>thicker
>cord?

I have that catolog, somwhere, and if i remember correctly it is kevlar thread.
 i have no clue how strong kevlar is but i don't think any type of thread could
support the weight or the stress.  

Ben R.

Soon to be NAR # here

"a man who lets another man make up his mind doesn't have one
of his own"

"3....2....1...Liftoff?"           "No!  Don't Crash!"

 
 
 

Anybody ever use Edmund Scientific's kevlar?

Post by Bob Kapl » Fri, 01 May 1998 04:00:00


Quote:

> I tried using it as shock cord with disappointing results.  It broke just
> about every time. It makes great shroud lines, though!

If you use nothing but kevlar for the whole shock cord, it's going to
probably break something. On competition models, I found my streamers
started to rip off. Something has to give somewhere. My solution was to put
a short piece of sewing elastic bungee in the system. It would almost always
break, but in doing so it absorbed the shock that caused the SEP.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html
NIRA:           http://ourworld.compuserve.com/homepages/Mark_Bundick/LAUNCH.HTM

 
 
 

Anybody ever use Edmund Scientific's kevlar?

Post by DGon » Sun, 03 May 1998 04:00:00


Quote:
>. I looked
>in my Edmund catalog and sure enough there it was a spool of 600 yrds. for
>$19.95

The spool I got from them was sewing thread. Very thin, and it will cut your
fingers if you try to break it by hand. I cut it with tin snips. Useful stuff.

My friend Jan had a totally different spool, like they have at dry cleaners. A
real length of tow. But I had though he got it from Edmund. So for a while I
though I'd been ripped off. I don't think that now. I have learned to use the
thread.

The thread has almost no elasticity. You can use it for *** a tube to a
fitting in the lab. But for rocket use, it might be too stiff. It would
concentrate the loads too much. The other posters have given their opinions.

I haven't had any trouble using cyanoacrylate glue with this thread.

Kevlar and Spectra are available as fishing line. Spectra braided cord is
available from Campmor. (1-800-CAMP-MOR)

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I may be tangential or vague to avoid disclosure.
I hope to change the infrastructure by inventing new ways to share.
If you write to me, I can share more.
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