[NRVR-Members] Shear Pins in Cardboard

Bob Schoner bob.schoner at gmail.com
Sat Apr 20 08:07:25 CDT 2019

Assuming that you are deploying the drogue from the booster section there
is no need for sheer pins to keep the coupler / av bay in place

With aggressive motors and very loose couplers it is possible to drag
separate the booster and payload section. In 25 years of high power I have
only seen that happen once.

Another good thing to do with payload airframe  is to put thin super glue
on the cardboard to stiffen it.

Hope that helps


On Sat, Apr 20, 2019 at 8:44 AM Adrien Drouault <adrien.drouault at gmail.com>

> So, I'm planning on flying my Binder Excel ("Take Too!") with full-up DD
> next weekend, and am to the point of shear pins for the upper bay (main
> chute).
> I've read about embedding (a) piece(s) of brass shim stock to reinforce
> the cardboard.
> What I'm not clear on is if I should just put one in the airframe tube, or
> if I should also reinforce the coupler/avbay tube.  It seems like both
> would be best, but everything I've been able to find online only mentions
> putting it in the body tube.
> Thoughts?
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