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I am making a rocket that carry a round shell. For my safety concern, my initial goal is to fly the rocket without the shell.
I make a rocket from a paper tube made by rolling a straw paper of 115 grams in 7 turns. with the length 100 mm, a nozzel 7mm ( 10 mm clay) ID 20 mm and a bore of 70 mm above the clay. Filled with meal BP (59% Pot. 32% of pine charcoal and 10% sulfur). There is no end plug, cause intended to attach the shell with a delay fuse.
Sometime the rocket took off very well to about 200 meter high, but some other rocket just bust off from the other end.
From the nozzel onward I fill it with the above BP (70 mm), and the rest of it I used different composition ( slower BP). I had it dry over night.
Could it be that the slower BP should add dextrin? Cause BP with dextrin would be very hard, when dry. It will hold the pressure and slow down the burning of the shell's fuse. I had try to ram this area very hard, but still the rocket burn through before the rocket reach to the height.
Thank you very much for any suggestion.
