BBX

So if a prop driven plane is tied to a flag pole (hypothetically...) will it be able to sustain flight? I guess what I'm asking is if the wind from the prop alone will create enough [lift?] to keep the plane in the air even though it will remain motionless.
This will help me understand the old conveyor topic a while back...

Thanks guys.

James-man

Where is it tied? Wing tip, tail???

How long is the rope?

Tony

is the flag pole at the front or the back of the treadmill?

In a nutshell...if the wing isnt moving through the air...OR ...if air IS NOT moving over the wing....no lift will be created = no flight

Rob Edwards

This experiment is done daily at John Wayne in Orange County. Because of the wealth that lives downstream of the runway in Newport Beach, planes throttle up to 100% thrust with the brakes on, so they can take off and attain maximal altitude before they fly over Newport Harbor.

With the brakes on, the plane doesn't fly anywhere. 'Course, it's not on a conveyer belt....

docmirror

OT

James-man

Anyone ever play tetherball?

BBX

from the tail, so it can't move forward...

mark kibort

yes, its called a helecopter
I know what you are asking, and its not really related to the conveyor belt experiement. that was only overcoming wheel bearing frition force.
This question is asking if the wings can impart a negative momentium as to lift the plane. Yes, its possible. it would be analogous to vectored thrust of a Harrier Jump Jet.

Dean_Fuller

No

SeanR

Go to Off Topic

https://rennlist.com/forums/off-topi...belt-pocb.html

pasa

no flight!! the wind must travel over the wing to produce lift. The prop is there to propel the airplane forward ( this in turn will cause air to flow over the wing and produce lift).

Cheers
Dan 1990 928GT

danglerb

I already stepped in this puddle once.

Adrian_

Actually the lift comes from the air flowing under the wing, but otherwise you're 100% correct, no flight. Unless you'd have a small, light plane with some enormous horsepower, tied to the pole under such vertical angle that it would allow the propeller to produce enough lift. But this plane would have to be made, because currently it doesn't exist Maybe the Dornier Do 335 http://en.wikipedia.org/wiki/Dornier_Do_335 would have been able to pull this stunt, but not tied from the tail, for obvious reasons (the tail propeller )


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1979 Euro

RKD in OKC

I got to take a ride in a confederate air force P51 Mustang. In order to be able to take off on the very short airfield we were flying out of and clear some power lines the pilot had to put the tail against a fence at the end of the runway and firewall the throttle holding the brakes hard. The tail lifted and the motor settled a bit then he let off the brakes for maximum acceleration down the short runway and barely clearing the orange ***** on the wires. Wings did not lift while full throttle with brakes on, only the tail.

pasa

Actually if you want to be 100% correct the lift comes form the difference in pressure between the bottom and top of the wing. Bernoulli's principle is the driving force behind the magic of flight. The top of an airfoil is curved whilst the bottom is flat. Air traveling over the top of a wing has to travel a longer distance as compared to the bottom of the wing. Air traveling faster has less pressure than air that is traveling slower So actually the (higher pressure) below the wing pushes the wing up toward the lower pressure (above the wing).

Cheers
Dan 1990 928GT