0
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')
Wiki User
∙ 9y ago
Wiki User
∙ 12y agoHelicopter blades can "spin" as fast as 500 rpm and as low as 179 rpm (RPM = revolutions per minute).
Anonymous
The main rotor head speed is designated as, "NR". It is important to know, because if you overspeed the rotorhead, it may damage the bearings. If your NR is too low, you don't fly! ;-)
Typically, in almost all helicopters, the NR is about 180 rpm. That seems to be the magic number.
Add your answer:
Earn +20 pts
How do helecopter blades spin so fast?
Helicopter blades operate from a transmission or gearbox immediately under the blades. They have to spin fast to give the helicopter lift. Once they are in the air the blades twist slightly to give forward motion.
How fast do the tips of helicopter rotor blades go?
Some helicopter main rotor blades spin at roughly 185 rpm and extend out up to 20 ft so your question is subjective to the helicopter you are speaking of.
What makes a helicopter tailspin?
What do you mean by tail spin? How the blades turn? How the back of the helicopter turns?
How do the blades on a helicopter spin?
They're hooked to a transmission which is hooked to an engine.
What cause the helicopter to lift up?
The rotating blades are angled in the same direction (at about 35 degrees) and spin fast enough for the air pressure beneath the helicopter to be higher than above so much so that the helicopter lifts off.
What is the top part of a helicopter called?
The top part of a helicopter would most commonly be considered the rotor blades (which spin to provide lift).
What is helicopter rotor and propeller?
The rotor is like the engine to the propeller. A propeller is the fan like blades on the top that spin to make the helicopter fly.
How does a helicopter take flight?
The rotor blades continuously spin until at a certain speed causing thrust to happen and the air pressure under the blades lower as said in daniel bernoullies principal when air or water moves at a certain speed the air under the blades lower allowing lift hope this helps a little, im not positive its correct. The above is not correct as the bernoullie effect has little to do with causing the helicopter to fly. The blades(rotors) spin at a fast enough rpm and are tilted as they spin thereby forcing air downward very fast so that this downward airstream compresses and pushes against the ambient air beneth the chopper thereby causing it to rise into the air.
What trees have helicopters?
The Acer Maple tree has seed pods designed to spin like little helicopter blades.
How helicopter work?
My understanding of how helicopters work is that they (suck) the air from above the blades and (blow) it down wards to create lift. the rear blades counter the spin of the top blades of it wasn't for them the helicopter would just spin round in circles (fun but not recommended) :-)
Why does the rotors spin on an helicopter?
The rotor blades on a helicopter work the same way as wings on a fixed wing aircraft. The air passing faster over the top of the airfoil generates lift. Helicopter rotors spin so that the lift is generated without having to have forward airspeed like a fixed wing aircraft.
If you spin a sword over your head really fast can you fly away like a helicopter?
Sadly Not, it's physically impossible.
