[roc-chat] Re: Super Strypi

  • From: Kurt Gugisberg <kurtgug@xxxxxxxxx>
  • To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
  • Date: Fri, 6 Nov 2015 16:15:59 -0800

So what was James' conclusion about nylon vs kevlar? This may end the
debate at last!


That's probably a good price for the 2000 lb kev. I bought 1/4" and 1/2"
for the larger rockets.

Kurt

On Fri, Nov 6, 2015 at 7:39 AM, Chris J Kobel <chris.j.kobel@xxxxxxxx>
wrote:

Kurt,



Check out http://emmakites.com/



Manufactured in China (not my first choice), but the prices are reasonable
and the customer service on two orders has been good.



James and I especially like the thinner braided Kevlar (380# tested) to
replace all of the elastic in our model and mid-power rockets. Lighter and
stronger than elastic (James got 3rd place in his 7th grade science
project - The “Shocking Truth”, Model Rocket Shock Cord Comparison), this
Kevlar is much easier to pack in a body tube and doesn’t get tangled like
the really thin stuff.



Chris



*From:* roc-chat-bounce@xxxxxxxxxxxxx [mailto:
roc-chat-bounce@xxxxxxxxxxxxx] *On Behalf Of *Kurt Gugisberg
*Sent:* Wednesday, November 04, 2015 8:33 PM
*To:* roc-chat@xxxxxxxxxxxxx
*Subject:* [roc-chat] Re: Super Strypi



Chris,

I didn't buy great quantities. It's just not cheap. I bought it from
Wildman in 1/4" and 1/2" widths.

Kurt



On Wed, Nov 4, 2015 at 3:20 PM, Chris J Kobel <chris.j.kobel@xxxxxxxx>
wrote:

Yeah, Payton and Kurt, curious to your source when you buy large quantity
Kevlar…



Chris



*From:* roc-chat-bounce@xxxxxxxxxxxxx [mailto:
roc-chat-bounce@xxxxxxxxxxxxx] *On Behalf Of *Payton Kramer
*Sent:* Wednesday, November 04, 2015 2:55 PM
*To:* roc-chat@xxxxxxxxxxxxx
*Subject:* [roc-chat] Re: Super Strypi



We've got 2 of these 1000yd spools..




---- On Wed, 04 Nov 2015 14:40:00 -0800 *kurtgug@xxxxxxxxx
<kurtgug@xxxxxxxxx> *wrote ----

I just bought $75 worth of braided kevlar.....just sayin'...

Kurt



On Wed, Nov 4, 2015 at 2:37 PM, David Smith <davew6dps@xxxxxxxxx> wrote:

Wait.

I thought the Kevlar was heresy, and nylon was orthodox.

;)

David P Smith
Tripoli 15803
NAR 78668
Amateur Extra: W6DPS
ROC Board Member

On Nov 4, 2015 2:30 PM, "Jim - TFJ" <jim@xxxxxxxxxxxxxxx> wrote:

≫ And prefer tubular nylon shock cords...

Heretic.



Jim G.



*From:* roc-chat-bounce@xxxxxxxxxxxxx [mailto:
roc-chat-bounce@xxxxxxxxxxxxx] *On Behalf Of *David Smith
*Sent:* Wednesday, November 04, 2015 2:02 PM
*To:* roc-chat@xxxxxxxxxxxxx
*Subject:* [roc-chat] Re: Super Strypi



I always like to have my launch lugs free to spin.

And prefer tubular nylon shock cords...

David P Smith
Tripoli 15803
NAR 78668
Amateur Extra: W6DPS
ROC Board Member

On Nov 4, 2015 1:59 PM, <kramer@xxxxxxxxxxxx> wrote:

The first launch of the SuperStrypi rocket
http://spaceflightnow.com/2015/11/04/air-force-declares-failure-on-super-strypi-test-launch/
failed
early in the first stage burn. Not to speculate, but the rocket did use a
rail to launch. I'm thinking that they let the launch lugs spin instead of
having the fixed, this caused a gyroscopic progression combined with the
Corilolis effect caused flow separation at the lugs resulting in unbalanced
mach cone development resulting in asymmetrical buffeting on the fins
causing flight instability resulting in failure....



If they ONLY would have kept the launch lugs from spinning the failure
could have been prevented...





Mike (nylon or Kevlar) Kramer

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