| General Data | |||
| First Flown: | 1945 | Length: | |
| Lift Capability: | Height: | ||
| Range: | Rotor Span: | ||
| Top Speed: | Empty Weight: | ||
| Service Ceiling: | Max Gross Weight: | ||
| Engines: | 1 Lycoming engine rated at 235 shp | ||
| Armament: | |||
| Accommodations: | 2 passengers | Cargo: | |
| Operators: | |||
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| Similar Aircraft: | none | ||
| Other Features: | Coaxial, super rigid rotors | ||
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| Notes | |||
| This was the next version of the X-44 that Hiller built. | |||
| This model used super rigid rotors. The picture above shows two men on the rotors with very little deflection. The purpose of this rotor design was to prevent the rotors from touching during manuvers. | |||



