This was Bruce O'Briens Shadow Composites Raven. Blimey! 38mm Minimum Diameter airframe. Just large enough for t' motor t' slide into. Begad! I made t' motor with a fast burnin' propellant. Total was about 1,100 Newton seconds. Ahoy! Burn time was ... Blimey! well, FAST! 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.