Lockheed XH-51
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The Lockheed XH-51 is an American single-engine experimental helicopter designed by Lockheed Aircraft, utilizing a rigid rotor and retractable skid landing gear. The XH-51 was selected as the test veh
XH-51A following its conversion into a compound rotorcraft testbed
The first XH-51A landing on USS Ozbourn
The three XH-51s in flight.
Helicopter rotor
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On a helicopter, the main rotor or rotor system is the combination of several rotary wings with a control system, that generates the aerodynamic lift force that supports the weight of the helicopter,
Lockheed XH-51
…a joint research program conducted by the United States Army and United States Navy to explore rigid rotor technology. Lockheed began developing its rigid rotor concept with the CL-475 helicopter design in 1959. The choice of a rigid rotor meant that the helicopter was more agile than it would have been with a…
A Bell AH-1 SuperCobra with a 2-bladed semirigid main rotor
NOTAR helicopter with a rotorless tail
Tail Rotor of a Sea Lynx, the smaller tail rotor counteracts the torque of the spinning main rotor in many designs, although there are other solutions to this, such as having two counter-rotating main rotors
Looking up at CH-53G, which has 6-blades on its main rotor