conveyor belt and plane answered at last ??
- Thread starter big-all
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The wheel is travelling at the same speed as the belt lets say 100mph, if you add a mileometer that is what it would read even though it is standing still
Is this an easyjet? because in my experience they get stuck on the runway no matter what 
Once more...... if the plane is standing still, it generates no wheel speed for the conveyor to respond to.
The plane MUST be moving FORWARD for the conveyor to respond to wheel movement.
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No the wheels MPH is at what ever speed the thing it's attached to is ie the plane
The wheels RPM is the only thing the belt can influence
I shall try one more time the aircraft is not relying on the conveyor to gather its momentum, ie; if you were running on a belt and it matches your speed you go nowhere fast, we all agree, good now lets say two mates either side grab your hands and pull you forward, you may lose your footing but you are going to be dragged forward simples, now as the engines of the aircraft are independant of the conveyor belt, prop or gas turbine the aircraft is going to move forward regardless of what the wheels are doing.
the aircraft is not relying on the conveyor to gather its momentum, ie; if you were running on a belt and it matches your speed you go nowhere fast, we all agree, good now lets say two mates either side grab your hands and pull you forward, you may lose your footing but you are going to be dragged forward simples, now as the engines of the aircraft are independant of the conveyor belt, prop or gas turbine the aircraft is going to move forward regardless of what the wheels are doing.what about a catapult at one end of the runway? (This thread could go further than concentration camps lol !)
(This thread could go further than concentration camps lol !)The wheels are of no consequence, they do not propel the aircraft! Also as i was the instigator of "con camps" i regard myself as a "record holder"
it's only been a few weeks, i dont want to lose my "WR" so soon. If you take the wheels off the nose will dive into the ground as soon as you open the gas.
Reckon we could keep it going till Christmas at least.
Going off at a slight tangent, on the nose wheel of the Vulcan there are two static white marks and one that moves left and right as the kite is towed about the airfield useing the "tug masters" if the marks travel further than they should then the sheer pin sheers and as the kite takes off the nose wheels stay on the ground
, it did happen. Whilst I see what you are saying, the wheels are of consequence, whilst they are not directly linked to the engines they are the ONLY way that the thrust can be converted to forward motion whilst on the ground. If they are of no consequence then engine tests where the pilot leaves the brakes on would make the plane take off rather than remain stationary.
If there were sufficient thrust, then the friction of the wheels on the ground (or less likely the friction of the brakes) would be overcome and the plane would skid along, but that's not part of the question.
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The easiest way to understand all this (I haven't read all the last trillion pages so someone may have already mentioned it) is imagine you are the plane on roller skates and the runway is one of those check-out supermarket moving things but it's in reverse mode.
You stand still with me next to you standing on the floor and when the belt starts to move, you also start to move backwards. I stop you from moving backwards as I'm right next to you with my hand on your back stopping you still. let's say the belt is going 10 miles an hour.
Marjorie the check out lady cranks up the mph to 20, 30 and 50mph. Your wheels are spinning like crazy but you are stood still still because I'm applying a bit of pressure to your back.
Then marjorie cranks it up to 250mph and all it takes is a gentle push of my hand and I can push you forwards along the conveyor which is doing 250mph, just because it's going faster doesn't mean there is any more pressure on my hand. I start to push you a little more and you move forward easy as pie. It doesnt matter how fast the belt is moving because whatever speed is happening is just getting absorbed up by the wheels going round and round.
Now subsitute my hand for an engine, attach a few wings to your arms and you'll 100% take off.
I'm not the world's greatest physicist, but what MWR wrote makes sense to me, as demonstrated by the following:
http://www.youtube.com/watch?v=S377HwOthjo&feature=relmfu
Power, wheels or anything else doesn't come into.
For the plane to move forward it has to go faster than the belt, believe it or not that means the wheels have to go faster than the belt. Simple
The belt/car is a good example of equilibrium, take the engine out and fit a propeller and you achieve the same equilibrium unless one goes faster..
For the plane to move forward it has to go faster than the belt, believe it or not that means the wheels have to go faster than the belt. Simple
The belt/car is a good example of equilibrium, take the engine out and fit a propeller and you achieve the same equilibrium unless one goes faster..
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