Developed in 1958, the helicopter is powered by three turbo-compressors; the tip-jet aircraft can operate on two of its three engines, which can function independently. The XV-1 Convertiplane rotor was used for the Model 120. To steer, the engine exhaust was used [Ref Hirschberg. The American Helicopter. Page 62].
Design authority: McDonnell Aircraft Corporation
Primary manufacturer: McDonnell Aircraft Corporation
Parent type: No type defined
Aircraft status: No longer flying
VTOL type: Helicopter
Lift configuration: Single main rotor
Crew required: 1
Crew seating: Single seater
Landing gear: Skids
Overall Dimensions | ||
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Overall Height: | 2.74 m | 9.0 ft |
Overall Length: | 9.45 m | 31.0 ft |
Overall Width: | 9.45 m | 31.0 ft |
Airframe Dimensions | ||
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Airframe Length: | 6.10 m | 20.0 ft |
Airframe Width: | ||
Airframe Height: | 2.74 m | 9.0 ft |
Landing Gear Dimensions | ||
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Landing Gear Base: | ||
Landing Gear Track: | 2.79 m | 9.2 ft |
Cabin Dimensions | ||
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Cabin Internal Height: | ||
Cabin Internal Length: | ||
Cabin Internal Width: |
Cruise Speed: 109 mph (175 km/h)
Weights | ||
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Max Gross Weight (ground): | 2,858 kg | 6,300 lb |
Max Gross Weight (airborne): | ||
Max Take-off Weight: | 2,858 kg | 6,300 lb |
Empty Weight: | 1,111 kg | 2,450 lb |
Useful Load: | 1,746 kg | 3,850 lb |
Empty Weight Fraction: | 0.389 |
Climb Performance | ||
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Max Rate of Climb: | 12 m/s | 2,400 fpm |
Hover Performance | ||
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Hover Ceiling IGE: | 3,658 m | 12,001 ft |
Hover Ceiling OGE: | 3,048 m | 10,000 ft |
Limitations | ||
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Max Level Flight Speed: | 222 km/h | 120 kts |
Never Exceed Speed: | ||
Service Ceiling: |
Range and Endurance | ||
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Max Range: | 158 km | 85 nm |
Max Endurance: | 1 hrs | 1 hrs |
Provided powerplant data is for uninstalled, sea level, static operations.
Powerplant | ||
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Number of engines: | 3 | |
Designation: | AiResearch GTC-85-35 turbine | |
Manufacturer: | AiResearch |
Normal Ratings | ||
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Max continuous: | ||
Take-off / rated: | 63 kW | 85 hp |
Intermediate: | ||
Maximum: |
OEI Ratings | ||
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OEI contingency: | ||
OEI continuous: | ||
OEI 30-second: | ||
OEI intermediate: |
Main Rotor Characteristics | ||
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Diameter: | 9.45 m | 31.00 ft |
RPM: | 410.0 rpm | 410.0 rpm |
Direction of Rotation: | Clockwise | |
Hub Type: | Stiff inplane, bearingless, damperless |
Main Rotor Blade Characteristics | ||
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Blade Construction: | ||
Blade Chord: | ||
Blade Tip Geometry: | Swept Tip-jet | |
Blade Twist: | ||
Number of Blades: | 3 |
Main Rotor Derived Characteristics | ||
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Disc Area: | 70.14 m² | 755.0 ft² |
Disc Loading: | 40.74 kg/m² | 8.345 lb/ft² |
Solidity: |
Main Rotor Blade Derived Characteristics | ||
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Blade area per blade: | ||
Tip Speed: | 202.87 m/s | 665.6 fps |
Tail Rotor Characteristics | ||
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Diameter: | ||
Configuration: | Unknown | |
Direction of Rotation: | Unknown | |
RPM: |
Tail Rotor Blade Characteristics | ||
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Number of Blades: | ||
Blade Construction: | N/A | |
Blade Chord: | ||
Blade Twist: |
Tail Rotor Derived Characteristics | ||
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Disc Area: | ||
Solidity: |
Tail Rotor Blade Derived Characteristics | ||
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Tip Speed: | ||
Blade Area (per blade): |