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HOBBY HELICOPTER —Construction Plans— |
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| 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. |
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| NOW AVAILABLE: Quality Rotor Blades for the Choppy | ||
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CHOPPY SPECIFICATIONS 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. |
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Complete CHOPPY Construction
Plans
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A
FREE BONUS
COMES WITH YOUR
PURCHASE Your Choppy Construction Manual comes with the Homebuilt Helicopter Guidebook |
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The Helicopter Experimenter's handbook covers, with clear, illustrated explanations, every aspect of homebuilt helicopters construction and design, including:
• Rotary gliders, gyroplanes and various
types of helicopters—each is discussed and compared. • Fuselage design, rotor hub and rotor
blade construction, plus various engine types are described. • All necessary materials are detailed,
with strength and weight figures provided. • Numerous suggestions are given for
constructing your helicopter with everyday, easily found
components. •
Several homebuilt rotorcraft are illustrated along with their specs.. • Sources of kits, parts and accessories
are listed. • Licensing requirements are
outlined—including the license-free ultralight ruling. . . . This and much more to guide the helicopter
experimenter! Your copy of this fascinating and highly informative Guidebook, presenting the world of small homebuilt and kit helicopters, is included at no extra cost with your order for the Choppy Construction Manual! |
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