Wright R-1820

The Wright R-1820 Cyclone 9 was an American Radial Engine developed by Curtiss-Wright and widely used on 1930s through 1950s aircraft.

HISTORY

The R-1820 Cyclone 9 represented a further development of the Wright P-2 engine dating back to 1925 . Featuring a greater displacement and a host of improvements, the R-1820 entered production in 1931 . The engine remained in production well into the 1950s.

The R-1820 was built under license by Lycoming and Pratt & Whitney Canada . The M-25,_and_the_[[Shvetsov" class="copylinks">Soviet Union Had Purchased A License For The Design, Designated M-25, And The [[Shvetsov OKB was formed to further develop the engine.

The R-1820 was at the heart of many famous aircraft including B-17 Flying Fortress and SBD Dauntless bombers, the early versions of the Polikarpov I-16 fighter (as M-25), and the CH-21 Shawnee helicopter.

VARIANTS

R-1820-97 - 1,200 hp (895 kW), turbosupercharged (gear-driven Supercharger plus a Turbocharger )

SPECIFICATIONS (R-1820-C9HC)

	type	9-cylinder supercharged air-cooled Radial Engine
	bore	6125 in (1556 mm)
	stroke	6875 in (174 mm)
	displacement	1,823 in³ (2988 L)
	length	4729 in (1,200 mm)
	diameter	5512 in (1,400 mm)
	weight	1,333 lb (605 kg)
	valvetrain	Two Pushrod -actuated valves per cylinder with Sodium -cooled exhaust valve
	supercharger	Single-stage two-speed Centrifugal Type Supercharger , compression ratio 7134:1 at low speed and 1004:1 at high speed
	fuelsystem	Stromberg PD12K10 downdraft Carburetor with automatic mixture control
	oilsystem	Dry Sump with one pressure and one scavenging pump
	coolingsystem	Air-cooled
	power	<br>
	specpower	071 hp/in³ (325 kW/L)
	compression	655:1
	power/weight	098 hp/lb (160 kW/kg)

REFERENCES

Bridgman, L, (ed.) (1998) ''Jane's fighting aircraft of World War II.'' Crescent. ISBN 0517679647

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