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30 size : Engine 0.3 cubic inch, Main Blades 550-600mm; 50 size : Engine 0.5 cubic inch, Main Blades 600-620mm; 60 size : Engine 0.6 cubic inch; 90 size : Engine 0.9 cubic inch, Main Blades 690-710mm; Modern RC helicopters are generally classed by the length of the main blades (with few exceptions). Common classes are: Micro (under 200mm main ...
Sikorsky S-72 modified as the X-Wing testbed, with experimental 4-blade main rotor. With a single main rotor helicopter, the creation of torque as the engine turns the rotor creates a torque effect that causes the body of the helicopter to turn in the opposite direction of the rotor. To eliminate this effect, some sort of antitorque control ...
In aeronautics, a swashplate is a mechanical device that translates input via the helicopter flight controls into motion of the main rotor blades. Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilot's commands from the non-rotating fuselage to the rotating rotor hub and mainblades.
The main rear landing gear retracts into the sponsons. [2] The Bell 222's rotor systems include: Two-blade, semi-rigid high-kinetic energy main rotor with preconing and underslinging. The rotor head incorporates elastomeric bearings for hub springs, and flapping and pitch change bearings. The system is similar in design to that used by the AH-1 ...
Collective angle of attack for the rotor main blades via the swashplate: Increase/decrease pitch angle of all main rotor blades equally, causing the aircraft to ascend/descend Increase/decrease torque. In some helicopters the throttle control(s) is a part of the collective stick. Rotor speed is kept basically constant throughout the flight.
A rigid rotorhead has no flapping or lag hinges but does have pitch change bearings. The flapping and lagging movement is accommodated by flexible sections (commonly elastomeric bearings) at the blade root or blade attachment. When using composite blades, the blades can also flex to provide a flapping motion. Benefits of rigid rotor system are: