Abstract: The scheme of High-Speed Helicopter RD15 is presented basded on the research of the existing schemes and their key technology . Besides calculation of the diskwing/rotor system and transfer process between the helicopter mode and the airplane mode, experiments are carried out to verify the calculation method and the feasibility of the scheme. The test model of diskwing/rotor and a test-rig are specially designed and built on this purpose. The lift and power are measured for different wind speeds, rotating speeds, and the angles of attack of the diskwing/rotor. It is confident that the mode transfer process is available since the changes of the foundamental parameters, such as the pitch angle of diskwing, the diameter, the collective pitch and the rotating speed of the rotor, go on smoothly and continuously.

Key words: high-speed helicopter, transfer process between the helicopter mode and the airplane mode, disk-wing/roter system, scheme of RD15