My 7.5" Big Motoreater on a Research N800 boost only. There is no smoke grain. This motor is a D grain for the 98/15360 Aerotech case and burns for 17 seconds. Liftoff weight was 60 lb., of which 27 lb. was the motor. Flown at Florida Winternationals 2008 to 12500 feet (and 2 miles upwind due to weathercocking).