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The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel. This configuration was very commonly used in aircraft engines before being superseded by turboshaft and turbojet engines. How a Radial Engine Works?
The Radial Chopper, with its Rotec 2800cc 110hp aircraft engine, turned heads at the Oshkosh Air Show. 
JRL Cycles' John Levey says he gets e-mails from pilots who likewise thought about the possibility of building a bike with a radial engine but never had the means to see their ideas to fruition. 
The Rotec R2800 is comprehensive and yet conservative by design, and has many desirable features and specifications:
* Total swept volume of 2800cc (172ci). 110HP @ 3700 RPM geared. Total engine diameter is 810mm (31.9").
* Dry Weight without any Acc's (no Starter Motor, Alternator or Carb) = 95 Kg
* Dry Weight with Acc's (Starter Motor + Alternator + Carb) = 102 Kg
* Propeller hub is driven via precision ground and matched taper. Propeller flange specs are standard and are the same as used for a Rotax 912 Series)
* Gearing is via a PSRU (Planetary Speed Reduction Unit) at a ratio of 3:2 Engine rpm:Prop rpm.
* Propeller / RPM Fixed 76" Diameter x 51"Pitch @ 2,400 RPM. Radial Engine Motorcycle VIDEO
VIA - Rotecradialengines & Motorcycle Usa
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Amazing 
