Doblhoff WNF 342
|Doblhoff WNF 342 V4 model in the Hubschraubermuseum Bückeburg (Bückeburg Helicopter Museum)|
|Role||Tip jet research helicopter|
|Designer||Friedrich von Doblhoff|
The Doblhoff/WNF 342 was the first helicopter to take off and land using tip jets to drive the rotor.
The WNF 342 was designed for a German Navy requirement for an observation platform for use from small ships and submarines.
The conventional piston engine drove both a small propeller (to provide airflow across a rudder) and an air compressor to provide air (subsequently mixed with fuel) through the rotor head and hollow rotor blades to combustion chambers at the rotor tips.
V1/V2: The first helicopter was initially powered by a 60 horsepower (45 kW) engine (V1) and then a 90 horsepower (67 kW) engine (V2)—both by Walter Mikron. It first flew in 1943, and was captured with V4 at Zell am See.
V3: The second WNF 342 had a larger rotor and was destroyed during testing.
V4: The last unit produced was a two-seat variant with new collective and cyclic controls.[clarification needed] After 25 flight hours it was captured by United States forces and on July 19, 1945, shipped to the US under Operation Lusty on HMS Reaper (D82).
Data from Illustrated Encyclopedia of Aircraft
- Crew: 2
- Main rotor diameter: 10.00 m (32 ft 9¾ in)
- Main rotor area: 78.54 m2 (845.42 ft2)
- Empty weight: 430 kg (948 lb)
- Gross weight: 640 kg (1,411 lb)
- Powerplant: 1 × BMW-Bramo Sh.14A radial piston engine, 104 kW (140 hp)
- Maximum speed: 48 km/h (30 mph)
- "Doblhoff". Hubschrauber Museum. Retrieved 2016-04-14.
- Ford, Roger (2013). Germany's Secret Weapons of World War II. London, United Kingdom: Amber Books. p. 224. ISBN 9781909160569.
- Orbis 1985, pp. 1454–1455
- Apostolo, Giorgio. The Illustrated Encyclopedia of Helicopters, pp. 18, 126. Bonanza Books, New York, 1984. ISBN 0-517-43935-2.