Life Pick 5 posters you'd like to have dinner with.

**Buehler445** · 08-25-2009, 05:20 PM

Quote:

Originally Posted by Donger

Yes, we've established what is required to produce lift.

Don't be an ass. That is what will happen regardless of what the wheels are doing. Another good example is that the wheels will move at a slower speed with a tailwind, which illustrates that it doesn't matter what the wheels do. If the engines are creating enough thrust to creade lift, the ****er's flying.

Baby Lee articulated it much more effectively than I did.
Posted via Mobile Device

**Donger** · 08-25-2009, 05:24 PM

Quote:

Originally Posted by Buehler445

Don't be an ass. That is what will happen regardless of what the wheels are doing. Another good example is that the wheels will move at a slower speed with a tailwind, which illustrates that it doesn't matter what the wheels do. If the engines are creating enough thrust to creade lift, the ****er's flying.

Baby Lee articulated it much more effectively than I did.
Posted via Mobile Device

Actually, the wheels in the treadmill scenario are very important. As I said, if the wheels are locked, then the treadmill basically acts as a catapult. The plane would quickly achieve sufficient ground speed (or air speed over the wings, if you prefer) required to achieve lift and flight. If the wheels are free to spin, that makes thing a bit more complicated.

**Buehler445** · 08-25-2009, 05:30 PM

Quote:

Originally Posted by Donger

Actually, the wheels in the treadmill scenario are very important. As I said, if the wheels are locked, then the treadmill basically acts as a catapult. The plane would quickly achieve sufficient ground speed (or air speed over the wings, if you prefer) required to achieve lift and flight. If the wheels are free to spin, that makes thing a bit more complicated.

The wheels don't matter. The thrust does.

You need to read Baby Lee's post.

**Donger** · 08-25-2009, 05:33 PM

Quote:

Originally Posted by Buehler445

The wheels don't matter. The thrust does.

You need to read Baby Lee's post.

If the wheels are locked and the treadmill moves, the wheels most certainly do matter. Because the plane will move in the direction the treadmill is moving, regardless of any other motive force.

**Buehler445** · 08-25-2009, 05:50 PM

Quote:

Originally Posted by Donger

If the wheels are locked and the treadmill moves, the wheels most certainly do matter. Because the plane will move in the direction the treadmill is moving, regardless of any other motive force.

WTF would you try to take off the plane with the brakes on? If you did, you'd likely just cause damage to the plane.

**Donger** · 08-25-2009, 05:51 PM

Quote:

Originally Posted by Buehler445

WTF would you try to take off the plane with the brakes on? If you did, you'd likely just cause damage to the plane.

**Donger** · 08-25-2009, 05:37 PM

Quote:

Originally Posted by Buehler445

The wheels don't matter. The thrust does.

You need to read Baby Lee's post.

Look at it this way:

A plane is sitting on a treadmill

The wheels are free to spin.

The plane's propeller is not moving (so it has no forward thrust).

The treadmill begins to move in the direction opposite the plane's normal direction (forward).

In that scenario (and assuming a lack of friction), what would happen to the plane?

Brock · 08-25-2009, 05:52 PM

Quote:

Originally Posted by Donger

Look at it this way:

A plane is sitting on a treadmill

The wheels are free to spin.

The plane's propeller is not moving (so it has no forward thrust).

The treadmill begins to move in the direction opposite the plane's normal direction (forward).

In that scenario (and assuming a lack of friction), what would happen to the plane?

Nothing.

**Donger** · 08-25-2009, 05:54 PM

Quote:

Originally Posted by Brock

Nothing.

Correct. Now, same scenario, but the treadmill is moving in the other direction (forward).

What happens to the plane?

Brock · 08-25-2009, 05:55 PM

Quote:

Originally Posted by Donger

Correct. Now, same scenario, but the treadmill is moving in the other direction (forward).

What happens to the plane?

If the wheels are freewheeling, nothing.

**Buehler445** · 08-25-2009, 05:53 PM

Quote:

Originally Posted by Donger

Look at it this way:

A plane is sitting on a treadmill

The wheels are free to spin.

The plane's propeller is not moving (so it has no forward thrust).

The treadmill begins to move in the direction opposite the plane's normal direction (forward).

In that scenario (and assuming a lack of friction), what would happen to the plane?

That's not the question. The question was would a plane take off on a treadmill, and the answer is yes.

**Donger** · 08-25-2009, 05:57 PM

Quote:

Originally Posted by Buehler445

That's not the question. The question was would a plane take off on a treadmill, and the answer is yes.

A plane on a treadmill will only achieve flight if there is sufficient airflow over the wings to generate the requisite amount of lift. That can only be achieved by the wings moving through the air, or a sufficient gust of wind blowing over the wings (not normal).

**Buehler445** · 08-25-2009, 05:59 PM

Quote:

Originally Posted by Donger

A plane on a treadmill will only achieve flight if there is sufficient airflow over the wings to generate the requisite amount of lift. That can only be achieved by the wings moving through the air, or a sufficient gust of wind blowing over the wings (not normal).

Dude. The thrust from the engines will create said airflow. REGARDLESS of what the wheels are doing.

Simply Red · 08-26-2009, 09:21 PM

Quote:

Originally Posted by Donger

Look at it this way:

A plane is sitting on a treadmill

The wheels are free to spin.

The plane's propeller is not moving (so it has no forward thrust).

The treadmill begins to move in the direction opposite the plane's normal direction (forward).

In that scenario (and assuming a lack of friction), what would happen to the plane?

This is totally wrong, you have it almost inverted, entirely. Please re-read your post. Ty honey.