The McDonnell XH-20 Little Henry was a 1940s American experimental lightweight helicopter designed and built by McDonnell Aircraft.
The McDonnell Model 38 was a lightweight experimental helicopter sponsored by the United States Army Air Force to test the concept of using small ramjets at the tips of the rotor blades. As a functional helicopter it was of simple open-frame steel-tube construction. Allocated the military designation XH-20 the first of two first flew on the 29 August 1947.
Although the XH-20 flew successfully the ramjets were noisy and burnt a large amount of fuel and plans to build a larger two-seat XH-29 were abandoned.
- McDonnell Model 38 experimental lightweight helicopter, two built.
- McDonnell Model 79 a proposed two-seat development, cancelled.
- United States
Aircraft on display 
Data from 
- Crew: 1
- Length: 12 ft 6 in (3.81 m)
- Height: 6 ft 8 in (2.03 m)
- Empty weight: 290 lb (132 kg)
- Powerplant: 2 × McDonnell Ramjets
- Main rotor diameter: 20 ft (6.1 m)
- Maximum speed: 50 mph (80 km/h; 43 kn)
See also 
- Related lists
- Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN ISBN 0-904597-22-9.
External links 
Media related to McDonnell XH-20 at Wikimedia Commons