Intermeshing-rotor helicopter

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An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The arrangement allows the helicopter to function without a tail rotor, which saves power. However, neither rotor lifts directly vertically, which reduces efficiency per each rotor.

Most intermeshing designs have two blades per mast, although exceptions such as the Kellett XR-10 with three blades per mast do exist.

The arrangement was developed in

• Flettner Fl 265 (1939)
• Flettner Fl 282 (1941)
• Kellett XR-8 (1944)
• Kaman K-225 (1947)
• Kellett XR-10 (1947)
• Praga E-1 (1947)
• SNCAC NC.2001 Abeille (1949)
• Kaman HH-43 Huskie (1953)
• Kaman K-700 (1969) (abandoned)
• Clybouw CW-105F (1973)
• DeGraw RDX1091 Hummingbird (1984)
• Kaman K-MAX (1991)

See also

• Coaxial-rotor helicopter
• Tandem-rotor helicopter
• Transverse-rotor helicopter

References

External links

• Media related to Intermeshing-rotor helicopters at Wikimedia Commons

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