|First flight||No first flight|
The Lerche was an early coleopter design. It would take off and land sitting on its tail, flying horizontally like a conventional aircraft. The pilot would lie prone in the nose. Most remarkably, it would be powered by two contra-rotating propellers which were contained in a donut-shaped annular wing.
The remarkably futuristic design was developed starting 1944 and concluding in March 1945. The aerodynamic principles of an annular wing were basically sound, but the proposal was faced with a whole host of unsolved manufacture and control problems which would have made the project highly impractical even were it not for the materials shortages of late-war Germany.
Specifications (Lerche II)
- Figures below are given for the 'Lerche II' plan dated 25 Feb 1945.
Data from 
- Crew: 1
- Length: 9.4 m (30 ft 10 in)
- Wingspan: 4 m (13 ft 1 in)
- Wing area: 12 m2 (130 sq ft)
- Empty weight: 4,500 kg (9,921 lb)
- Gross weight: 5,600 kg (12,346 lb)
- Powerplant: 2 × Daimler-Benz DB 605D V-12 liquid-cooled direct fuel-injected piston engines 2,000 PS (1,500 kW)
- Maximum speed: 800 km/h (497 mph; 432 kn)
- Cruising speed: 553 km/h (344 mph; 299 kn)
- Never exceed speed: 1,282 km/h (797 mph; 692 kn)
- Service ceiling: 14,300 m (46,916 ft)
- Rate of climb: 50 m/s (9,800 ft/min)
- Aircraft of comparable role, configuration and era
- Related lists
|Wikimedia Commons has media related to Heinkel aircraft.|
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (July 2011)|
- Luftwaffe Secret Projects - Ground Attack & Special Purpose Aircraft, D. Herwig & H. Rode, ISBN 1-85780-150-4
- Heinkel Lerche at Luft46.com