A ``large'' Speed 400 model might be a hand-launched glider like the Graupner Cumulus. It has a wingspan of 74''. A recommended power system might be a 3.5:1 geared Speed 480 (the 480 is a beefier 400) on 8 cells and an 11x8 electric folding prop. This combination swings the prop at 5500 RPM, pulling 12 amps and yielding a brisk climb to thermalling altitude in about 30 seconds. Total weight, with microservos is 30 ounces. Motor is $20, transferable gearbox is $25.