The Adams-Wilson "Choppy"
single-seat helicopter is undoubtedly the best known and most popular
homebuilt helicopter ever developed. Also known as the Flying Triumph
or Hobbycopter, this design was the inspiration for a number of other
successful homebuilts, including the A/W-95 and the Scorpion-I. The
40-page, 11" X 17" Construction Manual provides all necessary
details for building this affordable aircraft.
More about the
CONFIGURATION: Single seat. Two-bladed single main rotor.
Anti-torque tail rotor. Bolted aluminum-tube airframe. CONTROL: Main
rotor: full cyclic and collective pitch, incorporating a swash plate system.
Maximum registered control forces: cyclic 1½ lb., collective 5 lbs., rudder 5
lbs. Tail rotor pitch: bellcrank operated. Autorotation accomplished by
manual-disengagement lever at cyclic stick. POWER PLANT (Prototype):
Triumph motorcycle engine rated at 52 hp., 650 cc., vertical twin cylinder
O.H.V., magneto ignition, dry sump lubrication, kick lever starting, fuel 100
octane, fuel consumption approximately 4.2 gals. (U.S.) per hour at sea
level. Virtually any aircraft, motorcycle, marine, etc. engine of 450 c.c. to
1100 c.c., or 45 hp. or more may be substituted.
Choppy DVD Video (indicate above)