Intermeshing rotor
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(Redirected from Synchropter)
Intermeshing rotor or synchropter helicopters have two sets of contra-rotating propellers mounted on axles mounted at slightly oblique angles so that the blades intermesh without colliding. The arrangement allows the helicopter to forgo a tail rotor.
The arrangement was developed in Nazi Germany for a small anti-submarine warfare helicopter, the Flettner Fl 282 Kolibri. During the Cold War the American Kaman company started to produce similar helicopters for USAF firefighting purposes. Kamans have high stability and powerful lifting capability. The latest Kaman K-Max model is a dedicated sky crane design, used for construction works.
