There's only so much you can do to make a helicopter go faster; most helicopter operators are more worried about how much they can lift.
Most guys who need to fly a lot faster than helicopters can don't buy helicopters in the first place. If you need to go 300 mph in an aircraft, and you don't need to land in confined areas or hover, you're better off with a Pilatus PC12 or a King Air.
Ranges from 250 to 450 rpm.. If there is need to increase the speed then the rpm is eventually increased as per the need
The weight of the helicopter affects the terminal speed by influencing the rate at which the helicopter falls. A heavier helicopter will reach a higher terminal velocity compared to a lighter helicopter, as the force of gravity will be greater on the heavier helicopter, causing it to accelerate faster. Additionally, a heavier helicopter may require more lift to counteract its weight, which can also impact its terminal speed.
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If you are adding mass to the outside of the blades, it will make the blades rotate much more slowly. However if you add mass to the inside of the blades it will increase the rotational speed, however more force will be needed to start the rotation.
There are many different helicopter engines, most of them now jets
Cruising speed is about 150 mph.
About 170 mph.
The helicopter begins to fall because gravity is pulling its weight. As the helicopter accelerates, the air passing past the helicopter creates drag, as the helicopter continues to accelerate the drag Increases until the drag becomes equal to the weight, stopping it from accelerating. Even if the helicopter did not auto rotate it would still reach a terminal speed, however the terminal speed for the non auto rotating helicopter would be a lot higher and the helicopter would take longer to reach this speed.
They change the speed and angle of rotor, and speed of tail propeller.
No, a Cobra helicopter cannot break the sound barrier. The maximum speed of a Cobra helicopter is around 185-190 mph, which is significantly lower than the speed of sound (about 767 mph at sea level).
115 mph
That is about 160 mph.