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Topic: Alvis Leonides

In the News (Fri 17 Feb 12)

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	French and British Helicopters
		Manufactured in England under license from Sikorsky, this British version of the S-51 was powered by a 500-horsepower Alvis Leonides engine, and carried three passengers and a pilot.
		It had a cruising speed of 120 miles per hour, a maximum range of 310 miles, and could carry a useful load of 1,5250 pounds.
		The 48-foot diameter three-blade rotor was powered by a 550-horsepower Alvis Leonides engine.
	www.centennialofflight.gov /essay/Rotary/Brit_French/HE20.htm (1474 words)

	[2.0] Igor Sikorsky & The Beginnings Of The Helicopter Industry (Site not responding. Last check: 2007-10-14)
		Westland also sold commercial versions, including the "WS-51 Mark 1A", with an Alvis Leonides 521/1 engine with 390 kW (520 HP), and the WS-51 Mark 1B", which was similar to the Mark 1A but had a Pratt and Whitney R-985-B4 Wasp Junior radial engine with 335 kW (450 HP).
		The company also produced a derivative of the R-5 in the mid-1950s known as the "Widgeon", which featured a new automobile-style fuselage with seating for four passengers plus the pilot, an Alvis Leonides 521/1 engine, and the improved rotor of the bigger Sikorsky "S-55" helicopter, to be discussed elsewhere.
		A total of 14 Widgeons were built, some of them (including the prototype) being conversions of Dragonflies.
	www.vectorsite.net /avheli2.html (4624 words)

	Helicopter Aviation (Site not responding. Last check: 2007-10-14)
		(1) The prototype British construction flew in October that year, powered by a British piston engine, the Alvis Leonides 50, which developed 520hp.
		A prime example of this was the slightly thicker gauge metal required as a minimum for UK aircraft production compared to a thinner, lighter type allowed in US designs.
		Originally fitted with an under-powered Alvis Leonides piston engine, the Mk.10 was the first British helicopter to have a gas turbine installed.
	www.copters.com /hist/history_5.html (909 words)

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