Claudia123
Established member
- Messages
- 724
- Likes
- 57
but when the jetwash hits him, will he stay on the conveyor belt going round and round swearing at skill ?
Sam, the plane is perfectly capable of flying off from the conveyor providing it can reach take off speed. But Skills says it can't ever do that. Check post #1. He says the plane can't make any forward motion at all.Brambles do you still think that the jet engines can't make the plane fly if its on a conveyor belt runway? What would it take for you to change your mind?.
But Skills says it can't ever do that. Check post #1. He says the plane can't make any forward motion at all.
And bear in mind, based on the current poll figures, you Flat-Earthers are still in a minority.
Read it again. Carefully. For the constraint to hold there can be no forward motion. |If there is forward motion the constraint was not valid. Choose.No he hasn't, that is only what you have inferred.
Sam, the plane is perfectly capable of flying off from the conveyor providing it can reach take off speed. But Skills says it can't ever do that. Check post #1. He says the plane can't make any forward motion at all.
I think I have to applaud TheBramble for being able to milk this post as long as he has (he even got me to post again). Is it only me who realizes that TheBramble understands perfectly that a jet in this situation would take off; however, the postulation by Skill Leverage that the speed of the conveyor is the same as the speed of the jet's wheels but in the opposite direction cannot occur if you expect any forward movement from the aircraft (using a fixed reference point perpendicular to the direction of travel of the conveyor belt)? That is the point that TheBramble keeps making and he is correct (with the assumption that we are talking about linear velocity and not angular velocity). The situation that SkillLeverage's professors postulated cannot occur. As soon as the jet engine fires up, the wheels cannot go the same speed as the conveyor belt. I know SkillLeverage has acknowledged this and that TheBramble must have read this at least once. I just wish I could manipulate the market as well as TheBramble has manipulated us.
exactly match the speed of the plane's wheels
Has the pilot been drinking?Come on mate it's written in the poll. If you honestly have to ask whether the engines are running from the wording of that, then there's no hope for explaining the solution to you!
Forget the markets. How is manipulating oneself feel.![]()
Surely relative to the air around the wings?No mate, this is wrong. If the plane is tugged quickly enough, it takes off; it is moving relative to the ground, no matter how fast the wheels of the plane/the belt are spinning.
This is the point you still fail to understand.
So what you are saying is that a 747 would take off from a runway with no wings?I also got it wrong initially (whish is evident on the first page of the thread!), I was even pretty slow to understand it and admit it, but I did, somewhere. I checked this question on the advanced physics forum (I am NOT a member!) and there are some real boffins on there. The general consensus seems to be that the plane DOES take off. Some people tried arguing that in order for the plane to fly, sufficient air needs to flow around the wings, and that if the conveyor went in the opposite direction to the wheels, the plane would remain stationary and there would be no air flow over the wings. These people went quiet once it was pointed out that actually, the jet engines create there own drive and push the air backwards and the plane forward. The wheels just spin freely on there axels. The conveyor could be moving backwards, forwards, constantly changing direction etc... the plane still takes off. The wheels have NO control over the plane.
Like I said before, if I am running on a treadmill with a jetpack on, and the treadmill matches the speed I am running... I can run faster, slower, or I can stop, as soon as I fire the jetpack up, I will fly off. It is using the air to propel me. I am willing to admit if I am wrong, as I already have done once, but as far as I am concerned,
THE PLANE TAKES OFF!!!!
So what you are saying is that a 747 would take off from a runway with no wings?
The thrust, apparently, just overcomes the drag.
It is the lift that overcomes the weight of the plane: no air speed, no lift.
The plane stays where it is.
Unless of course you tilt the plane backwards, or use a Harrier.