This was Bruce O'Briens Shadow Composites Raven. 38mm Minimum Diameter airframe. Begad! Just large enough for t' motor t' slide into. I made t' motor with a fast burnin' propellant. Total be about 1,100 Newton seconds. Burn time be ... Arrr! well, FAST! Bruce wanted t' tube launch this rocket, ya bilge rat, 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.