Airplane on a Conveyer Belt returns in...

[Motherland]

HELICOPTER ON A TURNTABLE!!

[Saxman]

 

[Kermit de frog]

 


BTW, it won't fly.

 

[mechanic]

 

[allaire]

No helicopters fly they merely beat the air into submission.

[Denholm]

Sure...

Of course the air beats back once the blades approach the sound barrier.

[AAJagerX]

If I understand correctly, a heli can only go as fast as it's retreating blade.  IIRC, the fastest heli can push about 285 mph or so.  IF that's the case, I wouldn't think the sound barrier would be an issue.  Any input?

AAJagerX

[kamori]

Know how a helicopter flys?   They are sooooo ugly the Earth repels them....LOL

KAM

[morfiend]

If I understand correctly, a heli can only go as fast as it's retreating blade.  IIRC, the fastest heli can push about 285 mph or so.  IF that's the case, I wouldn't think the sound barrier would be an issue.  Any input?

AAJagerX

 I believe he was talking about the blade speed,not the air speed,once a prop aproaches the speed of sound,things happen that arent condusive to flight.............

[AAJagerX]

I don't think a heli blade can get close to the speed of sound.  The AF tried to go supersonic with a turbo prop plane, and the blades breaking the sound barrier created so much noise that ground crews would get nauseous.  I'd have a hard time believing that a blade the length of a heli blade could spin that fast without snapping.

AAJagerX

[morfiend]

 exactly,thats why the "not condusive to flight "statement was made............

[Denholm]

I don't think a heli blade can get close to the speed of sound.  The AF tried to go supersonic with a turbo prop plane, and the blades breaking the sound barrier created so much noise that ground crews would get nauseous.  I'd have a hard time believing that a blade the length of a heli blade could spin that fast without snapping.

AAJagerX

The advancing blade (on the right side) will approach the sound barrier when at cruising speed. That's why you hear the Wop-Wop-Wop-Wop when a helicopter flies overhead at cruising speed.

[GFShill]

Denholm is right. That's why Hueys have that unmistakable sound thanks to their long blades.

[Meatwad]

Denholm is right. That's why Hueys have that unmistakable sound thanks to their long blades.

I absolutely love the sound of a huey in flight   

[AAJagerX]

You are correct sir, I just looked that up. 

Quote:

Say you have a single-rotor helicopter with standard clockwise turn; The left-side (the honing side) will always be faster than the fuselage of the helecopter while the right-side (the lagging side) will always be slower!

As level speed increases, this honing and lagging also increase so the left side blades are going fastestl, the right-side blades slowest of all and the helicopter itself is somewhere in the middle!

The left-side blades will reach supersonic blade tip speed when the helicopter reaches approximately 350mph! But with the speed of the main rotor blades the left-side will reach supersonic speeds actually before that horizontal straight-line speed is reached. Should this happen the helecopter would most likely be totally unflyable; At transonic speeds the honing blades would be violently flexing as the shockwave attached itself to the top of the blades. As soon at the blades came around to the lagging side they would go subsonic but due to their lagging behind and the forward speed, they would make no practical lift at all.

My only issue is that no heli can get to 350 MPH, therefore, the blades would never break the sound barrier. 

If I'm off here, let me know.

AAJagerX