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292 RPMs, the speed of a propeller is limited by the speed of sound, rotor tip speed can't exceed it. The Apache rotors are 14.63m across. To see other specs. see link below.
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∙ 10y ago
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How fast does a military helicopter go?
The fastest are attack helicopters like Apache, they mostly fly about 230 -250 mph.
Why do people use helicopters when its emergency?
cause helicopters are really fast
How fast can the apache hellicopter go?
Most typical helicopters can only go about 150mph or maybe a little faster. Compound helicopters or the V-22 Tilt-Rotor can fly at over 200mph or even 300mph. The maximum airspeed of a helicopter is limited by the speed of the rotor blade. The speed of the tip of the blade can not go faster than the speed of sound or it will go through the sound barrier and start to form 'shock waves' which can lead to vibration.This can be alleviated somewhat by changing the angle of the leading edge on the tip so it sweeps back. This has been introduced on several helicopters such as the Apache, Black Hawk and Lynx. The rotor blade turns about 50-60 revolutions per second although this is largely dependent on the length of the blade. The further out from the centre, the faster the rotational velocity and the faster the air is flowing over the blade. As the helicopter moves forward through the air, the velocity of the air over the advancing blades is the sum of the Forward Velocity Plus the rotational speed of the blade. Retarding blades do not suffer this problem as the airspeed at the tips is reduced, by virtue of the fact that the blades are travelling in the same direction as the airflow caused by flight. For example: Suppose the speed of Rotor Blade tip (helo in a hover) = 350mph. Speed of the Helicopter in flight = 150mph. Speed of Advancing Blade (in flight) = 350 + 150 = 500mph This simple calculation will determine the maximum speed of the helicopter. The two coast guard helos I am familiar with are the old HH3-HF Pelican that had a V-Max forward airspeed of 142knots and the HH60 Jayhawk that is rated about 165
How fast can a helicopters go?
Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.
How fast will the helicopters go in the future?
Not much faster. True helicopters are limited in airspeed. The helicopter blade can not fly faster than the speed of sound or it begins to flutter and even stall. The advancing blade has to go through the air faster than the retreating blade. The speed of the blade is the sum of the speed of the helicopter in forward flight plus(+) the rotational speed of the turning blades. If they can design a blade that will work at slow speeds and at speeds greater than Mach 1, then maybe they can build a faster helicopter.
How fast do helicopter roter blades spin?
The speed of helicopter rotor blades through the air is limited by the speed of sound (approx. 760Mph) at which point the pressure wave disrupts the airflow at the blade tip (which is moving through the air faster than the blade root). So the larger the rotor diameter (the longer the blades), the lower the allowable RPM (the slower they 'spin')
How does a helicopter rise into the air?
Simple answer: By blowing air at the ground. Long answer: Air moving in the right way can have immense force behind it. Hurricanes can flatten trees, tornadoes can pick up cows and jet aircraft can use a directed jet of air to propel itself. The Rotor blades of a helicopters are like a massive, high powered fan that blows air downwards. Each rotor blade has an airfoil profile (similar shape to the cross section of an airplanes wing), so as the rotor blade turns it generates lift, just like an airplanes wing. The when the blades turn fast enough the lift forces will be greater than the forces of gravity. The pilot can control this by altering the angle of the blades. As the pilot increases the angle of the blades, more lift will be generated. In practice all helicopters do not have much variation in rotor speed during flight, and the rotor speeds are a lot slower than most people realise. But there's a problem known as Torque Reaction. If you just have a single main rotor, then as the helicopters blades starts to get to a state where lift from the blades equal the forces of gravity, the helicopter will start to spin on the spot. (A visual thing to see this in action is watch the film Black Hawk Down, when the helicopter gets shot and loses its tail rotor). To balance the forces induced by torque reaction, most helicopters have a tail rotor at the end of the tail boom. The tail rotor blades have a variable angle controlled by the pilot, like the main rotors. Adjusting the angle of blades will balance the forces of torque reaction. Altering this angle in a hover will allow the helicopter to turn on the spot.
How fast do helicopters land?
Ideally, not fast at all. A good pilot will land slowly and smoothly
How fast can an Apache attack helicopter travel?
232mph
How fast is a apache rlx 250 quad?
60-70mph
How fast can a helicopters speed go up to when its flyingg?
Very fast, they can reach top speed in a few minutes
How fast can the Apache helicopter fly?
It depends on which Apache version: AH-64A=265 mph;AH-64D=295 mph
