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 Scorpion-I, the A/W-95, and the Skytwister. Our Choppy Construction Plans details the construction of all parts of this affordable homebuilt helicopter. 

                                                       CHOPPY DESCRIPTION
 

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. Tail rotor pitch: bellcrank operated. Autorotation accomplished by manual-disengagement lever at cyclic stick.  
POWER PLANT (Prototype): 
Triumph motorcycle engine rated at 52 hp., 650cc, 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 450cc to 1100cc, or 45 hp or more may be substituted (such as the 50hp Rotax 503).  

 Price: complete set of Choppy plans, $49 USD (add $11 post. U.S., $29 foreign)
                   Further details online at: www.vortechonline.com/choppy/