Airplane on a Conveyer Belt returns in...

[AAJagerX]

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

Trim it out!

AAJagerX

[Vulcan]

If I'm off here, let me know.

AAJagerX

You are off.

[Strip]

Most of you are neglecting the RPM and blade length component in your though process....

A blade could go supersonic at 100 mph of forward flight or 400 mph, or any number for that matter depending on the two.

Strip

[AAJagerX]

You are off.

I can accept that.  I just want to know the how's and why's of it.  If you've got info, please share.

AAJagerX

EDIT:  Nevermind, I found an explanation that shed some light on the subject for me. 

[flight17]

helicopters cant go over 200kts becase at that speed, the back rotors will loose lift. The only way to get past that is to us a counter-rotating coaxial pusher design like that of the sikorsky X2. Because the 2 rotors are rotating in oposite directions, the lift will never be lost. the X2 is suppose to be able to fly over 250kts, though its flight testing has just started and has only reached 106kts so far.

as for the sound barrier, helicopter rotors can easily go over mach 1.

a CH-47 chinook has rotor diameter of 60ft so its circumfrence is 188.4ft. if at 1000rpm, the blades' tips are turning at 188,400ft/min=11,304,000ft/hr
11,304,000/5280=2140mph. as you can see, its clearly above the speed of sound.

[Karnak]

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 blades on the Tu-95 'Bear' go supersonic. That is why it is so noisy.  I have heard it is the noisiest aircraft in the world.

[Vulcan]

helicopters cant go over 200kts becase

Helicopter speed record:
August 11, 1986   John Egginton   249.1mph (216 knots)   Westland Lynx 800 G-LYNX   Fastest helicopter

Sorry you were saying?

[WWhiskey]

depends on the record your playing while the heli is on the turntable, maybe a little ACDC to kick it up a bit!

[mike8318]

You don't actually fly a helicopter. You take off and make a series of corrections..

[WWhiskey]

You don't actually fly a helicopter. You take off and make a series of corrections..

hopefully an endless series!

[allaire]

The blades on the Tu-95 'Bear' go supersonic. That is why it is so noisy.  I have heard it is the noisiest aircraft in the world.

Off-topic:  Sub crews have said that the bears prop noise was so loud that they could be heard while submerged.

[flight17]

Helicopter speed record:
August 11, 1986   John Egginton   249.1mph (216 knots)   Westland Lynx 800 G-LYNX   Fastest helicopter

Sorry you were saying?

in general helicopters cant go over 200kts. out of hundreds of helicopters that have been designed and made you have found one... and that was a one time deal. its designed max speed is only 201 mph. also, G-LYNX was also specially modified for that flight. so once again, no production helicopter is designed to fly over 200Kts

thats like saying the Convair 880 is a supersonic airliner because it broke mach 1 in a controled dive.

[Vulcan]

in general helicopters cant go over 200kts. out of hundreds of helicopters that have been designed and made you have found one...

you said:

helicopters cant go over 200kts becase at that speed

I found one. Therefore your statement was invalid, whether it was 1 or 100.

[flight17]

you said:

I found one. Therefore your statement was invalid, whether it was 1 or 100.

but its not a normal helicopter. it was a specially modified one. it also only happened once. so my statement is still valid. your just being obtuse and taking what i said out of context by using one example that has only happened once and under special circumstances. if that helicopter is able to fly at those speeds, then why doesnt it typically do it? also why is its max structural speed only 201mph?

thats like saying cars can go 350mph and then use a "car" that has a jet engine on it to proove the point.

so since you want to be so complicated, ill expand more on what i said for the second time... so... 99.998% give or take .1% of all helicopters cant hit 200kts or no production models can.

[Vulcan]

but its not a normal helicopter. it was a specially modified one.

So is it a helicopter or not?