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re: Can this 747 take off?
Posted on 4/10/24 at 4:28 pm to BottomlandBrew
Posted on 4/10/24 at 4:28 pm to BottomlandBrew
You still are thinking of terms of forward motion coming from energy sent to the wheels.
I don’t know how else to say it. The wheels don’t even play in the physics of it all really, outside of a very marginal increase of friction.
If you put a toy car on the string of a treadmill going at a moderate speed, you don’t feel a doubling of the pull if you double the speed. You feel almost the exact same force.
Similarly, the conveyor doesn’t impart enough force to negate the thrust of the engines no matter how fast it moves.
The conveyor can be running at 10x times takeoff speed and it won’t stop the aircraft.
I don’t know how else to say it. The wheels don’t even play in the physics of it all really, outside of a very marginal increase of friction.
If you put a toy car on the string of a treadmill going at a moderate speed, you don’t feel a doubling of the pull if you double the speed. You feel almost the exact same force.
Similarly, the conveyor doesn’t impart enough force to negate the thrust of the engines no matter how fast it moves.
The conveyor can be running at 10x times takeoff speed and it won’t stop the aircraft.
This post was edited on 4/10/24 at 4:32 pm
2
Posted on 4/10/24 at 4:38 pm to Volvagia
quote:
Similarly, the conveyor doesn’t impart enough force to negate the thrust of the engines no matter how fast it moves.
The conveyor can be running at 10x times takeoff speed and it won’t stop the aircraft.
This. The wheels would just be spinning in the direction the conveyor belt is moving while the plane takes off. No force from the wheel is transmitted to the plane.
Posted on 4/11/24 at 9:00 am to Volvagia
You can also expound on this and say that if you pull the toy car forward by the string it would not require more effort than if the treadmill were off. This is how the thrust of the planes engines work. The wheels are only there for the plan to sit on.
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