Dual Deployment and Brass

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2 weeks 6 days ago #419 by mcfrye2014
I've seen Allan and Brian use brass coupons inside their dual deployment rockets to make sure the shear pins shear without damaging the cardboard.  What is the specs on that?  < 1mm thick? Did you buy off Amazon?  THX

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2 weeks 3 days ago #421 by achoward
Replied by achoward on topic Dual Deployment and Brass
I bought a small sheet of 0.005X4X10" at either Hobby Lobby or Ace. I cut a piece about 1/2" square and scratch up the backside with coarse sandpaper and/or file. I also make sure there are no sharp corners or edges to bind via hand filing. I bend it slightly to conform to the inside AF. I clean roughed side with IPA. I have used either 5 min epoxy or CA to adhere. I use a piece of slick paper (wax, etc) on one side so the glue won't stick and then C-clamp it to cure. When done, drill hole for shear pin. I still put a little CA on the cardboard around the hole. But this has worked well for me. You'll want to test fit to ensure no binding.

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