The Kamov Design Bureau (design office prefix Ka) has more recently specialized in compact helicopters with coaxial rotors
, suitable for naval service and high-speed operations.
AVX and the Boeing-Sikorsky team are offering compound helicopters with coaxial rotors
AVX has developed and patented a unique compound helicopter configuration with coaxial rotors
and dual ducted fans that combine proven technologies to achieve greater speed, range, payload and utility than conventional helicopters.
Coaxial rotors are also used on China's Haiou (Seagull) drone developed by the Beijing University of Aeronautics and Astronautics.
Gyrodyne subsequently licensed its coaxial rotor technology to Germany's Dornier and Israel's IAI Malat.
The X2--a compound helicopter with coaxial rotors
and a pusher-propeller at the rear--has flown at speeds of up to 250 knots in level flight.
Interestingly, the runner-up for the Mavdem was a conventional helicopter configuration with a low-drag fuselage and a sensor pod mounted between two coaxial rotors
University of Maryland, College Park Proposal Title: Detailed Performance, Wakes, Pressures and Loads for High Speed Single and Coaxial Rotors
Approximate Amount: $310,001 Proposal Title: Fundamental Acoustic Design Tool Development and Validation for Rotorcraft External Noise Approximate Amount: $250,390 Proposal Title: A Helicopter Tip-Path-Plane Measurement System Using an Optics-Based Method Approximate Amount: $178,527 -- Universities Space Research Association, Columbia, Md.
Its S-97 Raider, developed from the X-2 technology demonstrator, is a new design that incorporates coaxial rotors
and a push propeller.
The S-97 will have coaxial rotors
and a pusher propeller, as tested with the two-seat 3600-kg X2 demonstrator.
Sikorsky's S-97 Raider scout and attack helicopter will be based on a prototype that has flown with coaxial rotors
The aircraft will feature a General Electric turbo shaft engine, coaxial rotors
and a six-bladed push propeller at the tail.