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  #1  
Old 05-02-2013, 10:33 PM
Stephen Toor Stephen Toor is offline
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Default what is the helicopter with the fastest rotor RPM

I am looking through all the helicopters and got to wondering which one has the fastest rotor RPM?

Anyone know the slowest too?
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Old 05-02-2013, 10:42 PM
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Stephen .... probably the slowest was the Hughes flying crane around 75-85 rpm I think.

Generally speaking it comes down to rotor diameter .... long blades rotate slower ..... short blades rotate faster.

Anyway , I dont know the fastest ..... but probably the Hughes 500 would be up there.
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Old 05-02-2013, 11:57 PM
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My guess Sikorski X2 or Lynx, but probably wrong. Just because the choppers are fast blades may not be. Lynx does have special high speed blades while the X2 is co-ax shorter and probably slower.
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Old 05-03-2013, 03:10 AM
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500D\E 487 to 492
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Old 05-03-2013, 03:43 AM
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HeliCycle at 600 - 620 ....
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Old 05-03-2013, 03:45 AM
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I think the Blackhawk is around 1200rpm according to the discovery channel.
Titanium/Stainless rotors.
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Old 05-03-2013, 04:25 AM
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Default Out of the Programmed Text at Ft. Rucker

Quote:
Originally Posted by Jincamty View Post
I think the Blackhawk is around 1200rpm according to the discovery channel.
Titanium/Stainless rotors.
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Old 05-03-2013, 04:42 AM
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Highest will be a small one since it's all tied to rotor diameter. Helicycle is the highest I can think of, the R22 & Mosquito are less.

That Hughes flying crane will be hard to beat for lowest - 88 rpm. The Mil Mi 26 is somewhere around 115 from what I recall.
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Old 05-03-2013, 09:21 AM
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Quote:
Originally Posted by Jincamty View Post
I think the Blackhawk is around 1200rpm according to the discovery channel...
It's the tail rotor rpm.
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Old 05-03-2013, 02:59 PM
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Quote:
Originally Posted by PTKay View Post
It's the tail rotor rpm.
Thanks for that,

It pays not to get facts from TV programs.

Cheers Cam.
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Old 05-03-2013, 03:47 PM
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Default It's all about tip speed

The actual tip speeds really fit into a narrower range than you might guess. When tips get going too fast, you get unwanted aerodynamic effects, and all the designers have that in mind.

Multiply the diameter by the rpm for lots of helicopters, and the results don't vary enormously from model to model.

A 26 foot rotor at 460 rpm and a 37 foot rotor at 325 rpm will give you essentially the same tip speed, near 425 mph (370 knots). If you wanted the same tip speed with a 100 foot diameter rotor, you would spin it only about 120 rpm.
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Old 11-11-2013, 04:10 PM
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Quote:
Originally Posted by Stephen Toor View Post
I am looking through all the helicopters and got to wondering which one has the fastest rotor RPM?
Man carrying;
E-volo VC1 probably the fastest rpm.


Quote:
Anyone know the slowest too?
AeroVelo, for sure the slowest rpm.
Dave
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Old 11-11-2013, 05:41 PM
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Hughes XH-17 had a speed of 88rpm

and the Comanche RAH 66 helicopter has very short and quite thin blades

but what is a helicopter ? does the osprey count ? or even the harrier , it can hover and land and take off vertically
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Old 11-12-2013, 01:26 PM
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I think the Osprey would be considered an fixed wing aircraft being its forward motion and lift depend on a wing not a rotor blade, but Hey I could be wrong, just my opinion! as far as rotor diameter being slower with greater length if you tried to spin up longer blades faster wouldnt that cause rotor blade deflection and twist? just asking!!
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Old 11-12-2013, 01:56 PM
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rrpm is irrelevant, tip speed counts
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