Calculation of Helicopter Flight Performace in Autorotation

Autorotacija je režim spuštanja helikoptera koji se primjenjuje po otkazu motora i izvedena na pravilan način omogućava sigurno slijetanje helikoptera. Reakcija pilota nakon otkaza motora treba biti pravovremena i točna, a vrijeme reakcije pilota ne bi smjelo biti veće od dopuštenog. U ovom radu opisana je tehnika upravljanja u autorotaciji i te su nabrojani i opisani čimbenici koji utječu na dinamiku nosivog rotora. Analiziran je H-V dijagram i karakteristične točke na dijagramu te su prikazane opasne kombinacije brzine i visine. Opisana su operativna ograničenja i zahtijevane performanse helikoptera pri otkazu motora kod slijetanja i uzlijetanja ovisno o klasi performansi.Autorotation is flight regime that pilot initiates after a helicopter engine fails. Performed in the right way autorotation enables safe landing of helicopter. Pilot response after the engine failure must be timely and accurate and the delay time should not exceed the permitted delay time. This paper descibes the control tehnique in autorotation that pilot should use. It is also described which factors and how affect the dynamics of the main rotor. The H-V diagram and characteristic points on the diagram showing dangerous combinations of speed and height were analyzed. The operational limitations and required performance of the helicopter in the event of engine failure during landing and takeoff depending on the performance class are described