title: The Choppy
HOBBY HELICOPTER
Construction Plans
 
Choppy Hobbycopter flying

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 and the Skytwister.

YES! we sell quality parts
for building a Choppy
Also see our chart of Choppy kits
CHOPPY SPECIFICATIONS

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.


Choppy: "Flying Triumph"
NOW AVAILABLE: Quality parts & kits for building a Choppy
Choppy on ground
CHOPPY SPECIFICATIONS—continued

Height............................................................... 6 ft
Length............................................................ 15 ft
Empty Weight...................................... 300+ lbs*
Gross Weight ...................................... 600 lbs**
Payload Weight ...................................... 300 lbs
Main Rotor Diameter .............................. 21½ ft
Tail Rotor Diameter ................................... 3½ ft
Power Loading (lbs/h.p.) ............................. 11.5
Disc Loading (lbs/sq ft) ................................. 1.8
Maximum Speed ..................................... 85 mph
Cruise Speed ........................................... 65 mph
Rate Of Climb ....................................... 950 fpm
Maximum Altitude ................................. 8500 ft

*Please note: when powered by a lightweight two-cycle engine, the Choppy may have an empty weight of under 254 pounds and qualify as a license-free ultralight aircraft. **The Gross Weight may be increased when more powerful engines are used.
 

Complete CHOPPY Construction Plans

The 40-page, 11” X 17” Construction Manual provides
all necessary details for building this affordable aircraft.

Only $48 (add $6 post U.S., $11 foreign)
ALSO SEE:  The latest update for the Choppy: The A/W 95
 
A Choppy/AW 95 Video is available. See the Order Form
 

HOW TO ORDER

With a credit card (Visa, Mastercard, American Express), you can order 24 hours a day:
  • ComputerONLINE, via secure order form

    • telephoneby PHONE: 410-663-8022

    • Fax machineby FAX: 410-668-8518

    OR: simply MAIL a check, money order, or credit card number & expiration information to:
    VORTECH, Inc., Box 511-W, Fallston, MD 21047

    See Vortech's quality parts for building the Choppy

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