A plane on a conveyor belt
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Man of Honour
You can't be serious! So a plane on a treadmill generates air movement (aka wind)?
The wheels are not fixed, they spin with the movement of the treadmill. The plane is then free to move forwards at whatever speed it likes - the engines provide the thrust to move forwards and it then takes off.
The conveyor belt is the length of a runway remember...
The Plane isn't trying to stay on or match the speed of the conveyor belt
The conveyor belt matches the speed of the wheels NOT the plane
The plane hurtles along the belt and takes off with the wheels spinning twice as fast as normal.
Get it? Got it? Sorted?
A cake that was thrown away I would've eaten that!
"... once filming was completed, we would have liked to have offered the Fabia cake to local charities, schools and hospitals. Unfortunately, as the car had been under studio lights for several days, it may have posed a health and safety risk if eaten and we were therefore unable to do this.
It was decided that as we were unable to donate the cake to charity, the cake was instead recycled. It was taken away and composted, so that it could return to the natural environment. The cake was taken to a place called the East London Community Recycling Project in Clapton. The project has been set up to provide local residents and members with quality compost for use on their gardens or allotments."
Anyway, back on topic...
Soldato
Please please please read the thread - we've covered this and several other "issues" already!
/me un-subscribes!!
Soldato
"... once filming was completed, we would have liked to have offered the Fabia cake to local charities, schools and hospitals. Unfortunately, as the car had been under studio lights for several days, it may have posed a health and safety risk if eaten and we were therefore unable to do this.
It was decided that as we were unable to donate the cake to charity, the cake was instead recycled. It was taken away and composted, so that it could return to the natural environment. The cake was taken to a place called the East London Community Recycling Project in Clapton. The project has been set up to provide local residents and members with quality compost for use on their gardens or allotments."
Who cares about the health risk I'd have still eaten it!!!
And it takes off because...
THERE IS LIFT - what causes lift? THE VERTICAL FORCE COMPONENT ON THE WINGS DUE TO AIRFLOW.
Man of Honour
Best explanation in this thread imo, if you don't understand after reading this then you're hopeless
Permabanned
Soldato
Going waaaay back to the OP regarding Mythbusters, I think the bottom line here sums it all up:
mythbusters said:
Soldato
It's pretty funny on that Mythbusters clip that the pilot didn't even believe it
Soldato
Mohinder's explanation is what made it click with me.
Very good.
Very good.
Soldato
Tell me why there's no airflow.
By your argument, if you rested a toy car (with free-spinning wheels) on a similar conveyor belt and pushed with all your might, it would stay perfectly still while the conveyor belt would spin wildly.
In fact, the conveyor belt could even be vertical, with the car resting against it, and the car would just stay there rather than falling down.
These are both exactly the same principle as the plane problem; do they sound in any way plausible?
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I agree the plane does take off. But you can't be serious. So from you're point of view, if there is no air movement over wings what makes it take off. Let's work backwards...
Plane takes off.
This is because there is lift.
Lift is there because there is a vertical force on wings.
This vertical force is due to the airflow over wings.
Airflow is there because the plane is moving against the atmosphere.
The plane is moving because of thrust.
Thrust is there due to engines.
The engines keep the plane on the belt.
Read my post again. Where did I say there is no airflow. There is. Zefan thinks there isn't.
Man of Honour
There isn't airflow, it's the plane moving through the air that creates the lift... I haven't ever said that there's no lift.
The plane moves forwards, that is where the lift comes from.
You're claiming that there's somehow lift produced when the plane is still, that my friend is completely crazy.
I got through half a page and my head imploded.. but,
Is the conveyor belt acting on the wheels to make the plane appear to be stationary after the thrust is engaged?
Basically, has the pilot pushed the 'yoke thing' foward, making the bigg ass engines do their thing, yet the reverse direction of the moving floor beneath is causing the plane to appear stationary?
If this is what the experiment is trying to achieve, couldnt the 'hand brake' just be left on to give the same effect? And surely this would mean no lift off?..
Probably not, but I like butter
Is the conveyor belt acting on the wheels to make the plane appear to be stationary after the thrust is engaged?
Basically, has the pilot pushed the 'yoke thing' foward, making the bigg ass engines do their thing, yet the reverse direction of the moving floor beneath is causing the plane to appear stationary?
If this is what the experiment is trying to achieve, couldnt the 'hand brake' just be left on to give the same effect? And surely this would mean no lift off?..
Probably not, but I like butter
No, because the wheels would still need to move freely.
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