Radial Engine
An engine design where the cylinders are designed symmetrically around a central crankshaft and hence radiate out.
See also: 1/6th Kinner Radial model built by Mick Cherry.
Radial engine - A reciprocating aircraft engine in which all of the cylinders are arranged radially, or spoke-like, around a small crankcase. Also referred to as round engines.
Radial Engine: An aero-engine with its cylinders arranged radially around the crankshaft, the cylinders being stationary and the crankshaft revolving.
RADIAL ENGINE - One in which the cylinders are mounted equidistant and circumferentially around a circular crankcase. Cylinders and crankcase are fixed, and the crankshaft rotates.
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Using a radial engine similar to that designed by Lawrence Hargrave in 1887, he built a power plant that weighed 208 pounds and produced an astonishing 52.4 horsepower.
The original (commercial production) 4-AT had three air cooled Wright radial engines. It carried a crew of three-pilot, co-pilot and stewardess-and eight or nine passengers. The later 5-AT had more powerful Pratt & Whitney engines.
Rounding out the Bearcat look is its radial engine: a 360 hp, fuel-injected, nine-cylinder Vedeneyev M14P. On startup, the aircraft billows out smoke from the exhaust, rumbles down the taxiway and thunders into the sky with a commanding presence.
Fokker DR-1 (1917) reproduction is currently fitted with a modern 220hp Continental radial engine.
Curtiss Jennv JN4H (1918) original a/c, s/n 3919 N3918.
Nieuport XI (1915) reproduction with an original 80hp LeRhone rotary engine and instruments.
Early helicopter designs first utilized custom-built engines or rotary engines designed for airplanes, but these were soon replaced by more powerful automobile engines and radial engines.
You can see in the illustration that this is a five-cylinder engine -- radial engines typically have anywhere from three to nine cylinders. The radial engine has the same sort of pistons, valves and spark plugs that any four-stroke engine has.
Pratt & Whitney R-1830-9 Twin Wasp radial engine,
850 hp (634 kW)
Pratt & Whitney R-1830-45 Twin Wasp radial engine,
1,050 hp (783 kW)
Armament:
One 0.30 in machine gun;
one 0.50 in machine gun;
up to 300 lb (136 kg) of bombs ...
COLLECTOR RING - A circular duct on a radial engine into which exhaust gases from its cylinders are discharged.
 See also: Aircraft, Radial, Flight, Power, Speed
  
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