Two flights at t' 2010 LDRS-29 event. Aye aye! Blimey! T' first one was a sugar powered K-motor (estimated cost $8) and t' second an Aerotech K-540 AP/Composite motor ($110). Begad! Blimey! T' three grain one inch core 75mm sugar motor was comparable t' t' four grain 54mm Aerotech motor in performance.