BP is MUCH more sensitive to pressure than the sugar mix. It is the one
more likely to "run away" on you, but hopefully your rocket is near apogee
and far away from you when the ejection charge goes off.
I like the clever burn modifier for the delay charge...never heard of using
baking soda before.
Those PVC pipes are pretty stout but PVC does make sharp shards when it
lets go. If you're still worried about that you could wrap a couple of
layers of strapping tape (with the glass fibers) around it (hoopwise) and
have a "filament wound" motor case without much weight penalty. I do that
on some similar PVC motors I've built.
On Tue, Apr 18, 2017 at 2:35 PM, BrianK ABQ <cielobenazul@xxxxxxxxx> wrote:
PVC has very limited uses. But it is usable. John Wickam's book shows
making a J motor with AN/Mg composite. He does lots of calculations and
runs a very low CP.
Of the simple propellant choices; I'd say sugar ones give the best balance
of simplicity, performance and safety. And everything; and I do mean
everything, you'll ever need to know about sugar propellants is on Richard
Nakka's incredible website. He's spent decades on the stuff.
nakka-rocketry.net
As for fragments? You shouldn't have a set up where you and they will
interact. In motor testing, you always have some barrier between you and
the motor. If it's heading off in a rocket; you use distance.
