what is the rpm of engine of helicopter?
what is the rpm of its wings?
depending on the model helicopter..the engine speed can vary. However, on a UH-60 blackhawk type helicopter the engine RPM is about 20,900 rpm producing about 1950 shp per engine. There are 2 engines installed on most military or commercial for hire aircraftin the event 1 should fail the aircraft is designed to fly on one engine...
The speed is reduced to 258 RPM at the main rotor hub...about a 81 to 1 reduction in speed BUT, no loss of torque or power.
The blade tip speed is roughly 350 or so miles per hour or.... the rotor head will spin about 4 times a second. The longer the blade is the faster the tips will spin, the blade is manufactured to not produce lift at the tip. Most of the lift is produced in the middle part of the blade . The blade incorporates a negative twist to reduce the tips from trying to produce lift.