4 ms·

> the treadmill can equal the forward thrust of the engines Did anyone really phrase the problem so incorrectly? All I find is: "This conveyor has a control s

by ivank 17y ago

> the treadmill can equal the forward thrust of the engines Did anyone really phrase the problem so incorrectly? All I find is: "This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction)." or "The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction."

run4yourlives 17y ago
When the plane is on the ground, the engines are useless if forward movement is negated by the treadmill. The wheels are required to take off.
- ivank 17y ago
  Moving the treadmill at the same speed (in reverse) just doubles the rotational speed of the wheels. It does not have any major impact.
- Retric 17y ago
  You can move an aircraft which has it's wheel breaks set. Roling friction reduces take off speed, but it's not nessisary on high preformance aircraft.
  - run4yourlives 17y ago
    Of course you can, because the break isn't strong enough to counter the engine. The treadmill in question though is designed to keep the aircraft stationary.
    - TrevorJ 17y ago
      That's the crux of the issue. If you could somehow make a treadmill that keeps the plane stationary then it wont take off. However, any treadmill built in the real world will be unable to keep a normal aircraft stationary.
    - Retric 17y ago
      The limit is the friction your tires have with the ground. In a car your breaks are actualy to powerful to provide maximum breaking. Once they start to skidd the friction is greatly reduced which is why you have anti lock breaks.
  - lisper 17y ago
    Actually, most planes have brakes that are strong enough to keep the plane stationary at maximum engine thrust. If they didn't you couldn't do an engine runup. But no plane is able take off with the brakes set, treadmill or no treadmill.
    - Retric 17y ago
      You are not limited by the breaks only the tires friction which depends on weight. So in many cases, you can start to move if you don't have enough cargo and fuel on board. PS: You really do need to tie down an F-15 to do a maximum engine thrust test. Edit: As I said "high preformance"
      - lisper 17y ago
        And as I said: most planes.
- TrevorJ 17y ago
  This is not completely on-topic, but in the nicest way possible, I'd like to bring up the fact that downmodding shouldn't be used to disagree with somebody. (Not happening to me, but I notice that some people are getting downmodded for apparently that reason). This isn't meant to start a debate, just a friendly observation.

by ivank 17y ago

run4yourlives 17y ago

When the plane is on the ground, the engines are useless if forward movement is negated by the treadmill. The wheels are required to take off.

ivank 17y ago
Moving the treadmill at the same speed (in reverse) just doubles the rotational speed of the wheels. It does not have any major impact.
Retric 17y ago
You can move an aircraft which has it's wheel breaks set. Roling friction reduces take off speed, but it's not nessisary on high preformance aircraft.
- run4yourlives 17y ago
  Of course you can, because the break isn't strong enough to counter the engine. The treadmill in question though is designed to keep the aircraft stationary.
  - TrevorJ 17y ago
    That's the crux of the issue. If you could somehow make a treadmill that keeps the plane stationary then it wont take off. However, any treadmill built in the real world will be unable to keep a normal aircraft stationary.
  - Retric 17y ago
    The limit is the friction your tires have with the ground. In a car your breaks are actualy to powerful to provide maximum breaking. Once they start to skidd the friction is greatly reduced which is why you have anti lock breaks.
- lisper 17y ago
  Actually, most planes have brakes that are strong enough to keep the plane stationary at maximum engine thrust. If they didn't you couldn't do an engine runup. But no plane is able take off with the brakes set, treadmill or no treadmill.
  - Retric 17y ago
    You are not limited by the breaks only the tires friction which depends on weight. So in many cases, you can start to move if you don't have enough cargo and fuel on board. PS: You really do need to tie down an F-15 to do a maximum engine thrust test. Edit: As I said "high preformance"
    - lisper 17y ago
      And as I said: most planes.
TrevorJ 17y ago
This is not completely on-topic, but in the nicest way possible, I'd like to bring up the fact that downmodding shouldn't be used to disagree with somebody. (Not happening to me, but I notice that some people are getting downmodded for apparently that reason). This isn't meant to start a debate, just a friendly observation.