Same with Blackhorn 209. It's soooooooooo much cleaner than Pyrodex or any other BP substitute. I've been meaning to test it for rocket deployment, may be able to get to it this winter or early spring.
I agree, i have used 1, many times.
I think if you look at your rocket and compare it with rockets from other people, the exact conditions right at the shear pin can vary a bit. If you take 2 long strips of metal, lap them a few inches and put a bolt through there that would be called single shear and the conditions are fairly repeatable so the construction industry has good data for the strength of this condition. Consider the same condition on a rocket and you are talking about cardboard/phenolic/fiberglass instead of sharp edged metal, and there might be a variable gap between the layers. So as the system is trying to shear the bolt the tube materials can deform. I've read that some people incorporate some thin layers of metal to do a more controlled shearing. And the airframe volume and amount of ejection charge are also variables. So ultimately you have to do the ground tests on your combination.
