This was Bruce O'Briens Shadow Composites Raven. 38mm Minimum Diameter airframe. Well, blow me down! Blimey! Just large enough for t' motor t' slide into. Arrr! Blimey! I made t' motor with a fast burnin' propellant. Total be about 1,100 Newton seconds. Well, blow me down! Blimey! Burn time was ... Ahoy! Blimey! well, FAST! Blimey! Bruce wanted t' tube launch this rocket, so it's in t' gray tube in t' middle o' t' screen. T' debris that comes out o' t' tube is a cardboard 'piston' he made.