<div><div dir="auto">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 </div></div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">Another good thing to do with payload airframe is to put thin super glue on the cardboard to stiffen it. </div><div dir="auto"><br></div><div dir="auto">Hope that helps</div><div dir="auto"><br></div><div dir="auto">Bob</div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 20, 2019 at 8:44 AM Adrien Drouault <<a href="mailto:adrien.drouault@gmail.com">adrien.drouault@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">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).<div dir="auto"><br></div><div dir="auto">I've read about embedding (a) piece(s) of brass shim stock to reinforce the cardboard.</div><div dir="auto"><br></div><div dir="auto">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.</div><div dir="auto"><br></div><div dir="auto">Thoughts?</div><div dir="auto"><br></div></div>
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