__notoc__ {| |} the adams-wilson hobbycopter (later named the adams-wilson choppy) is a small, single-seat, open-framework helicopter designed for homebuilding, to be powered by a motorcycle engine. ==design and development== the adams-wilson company was formed by t.g. adams and paul wilson to market plans for a simple single-seat helicopter named the hobbycopter, of which they have built a prototype. this prototype flew successfully for the first time in november 1958. plans were first marketed in 1958 and have been revised and revived by various designers over the years. the hobbycopter, (also colloquially known as the flying triumph), was designed to use commonly found materials that were readily available to customers. the hobbycopter was designed to use a motorcycle engine of about  and a variety engines have been used, including a snowmobile motor and more recently, an ultralight 2-cycle rotax engine developing . ==variants== ;hobbycopter xh-1: the prototype of the one-man open framework homebuitl helicopter powered by a  triumph motorcycle engine. ;hobbycopter 101:production version pof the xh-1 offered as a kit for $900, or as plans for $35 to homebuilders. ;hobbycopter 102:strengthened model 101 with  triumph and a fibre-glass cockpit enclosure. ==specifications (hobbycopter 101) == {{aircraft specs |ref= |prime units?=kts |genhide= |crew=1 |capacity= |length m=4.57 |length ft= |length in= |length note= |span m= |span ft= |span in= |span note= |upper span m= |upper span ft= |upper span in= |upper span note= |mid span m= |mid span ft= |mid span in= |mid span note= |lower span m= |lower span ft= |lower span in= |lower span note= |swept m= |swept ft= |swept in= |swept note= |dia m= |dia ft= |dia in= |dia note= |width m= |width ft= |width in= |width note= |height m=1.83 |height ft= |height in= |height note= |wing area sqm= |wing area sqft= |wing area note= |swept area sqm= |swept area sqft= |swept area note= |volume m3= |volume ft3= |volume note= |aspect ratio= |airfoil= |empty weight kg= |empty weight lb=300 |empty weight note= |gross weight kg= |gross weight lb= |gross weight note= |max takeoff weight kg= |max takeoff weight lb=600 |max takeoff weight note= |fuel capacity= |lift kg= |lift lb= |lift note= |more general= |eng1 number=1 |eng1 name=[[triumph motorcycle engi
Homebuilt_aircraft Single-engined_piston_helicopters United_States_helicopters_1950a1959 United_States_sport_aircraft_1950a1959