The Return of the most infamous HB thread of all time... :D

**2manymustangs** · 01-22-2014, 03:47 PM

Originally Posted by Tishimself

There is no set speed for the treadmill. It can go as fast as it needs to in order to counter any forward movement of the plane. Remember, the moment the wheels start turning faster than the treadmill, the plane will move, once they are spinning at the same speed, the plane will stop. Since the wheels will not ever be able to spin faster than the treadmill, the plane can not move. As for what it represents. Nothing. Its just the instrument used to illustrate this version of the question.

THRUST is going to move the plane foward (either jet or SCREWING ITSELF through the air)... I'm just trying to find out how fast you have the plane going backwards on the pretend treadmill... I wanna know how long (not IF but WHEN) it will take me to lift off as soon as I start making thrust, without any thrust the wheels are glued to the treadmill belt just like the aero-plane is and she is going backwards...

**Tishimself** · 01-22-2014, 03:55 PM

Originally Posted by 2manymustangs

THRUST is going to move the plane foward (either jet or SCREWING ITSELF through the air)... I'm just trying to find out how fast you have the plane going backwards on the pretend treadmill... I wanna know how long (not IF but WHEN) it will take me to lift off as soon as I start making thrust, without any thrust the wheels are glued to the treadmill belt just like the aero-plane is and she is going backwards...

Let's say for the sake of argument, that the engines on a jet propel it forward at 800 miles per hour (I have no idea how fast they really go, but bear with me here). Now imagine that the plane is sitting on a really long conveyor belt. Both the belt and the plane are stationary, and the jet engines are off. Now, imagine that the conveyor belt starts moving at 800 mph. Seeing that the plane's engines are off, the plane gets dragged backward at 800 mph by the belt.

Now, if the pilot fires up those engines, that 800 mph of force is only going to counteract the backwards-moving conveyor belt, right? 800 mph in one direction less 800 mph in the other direction equals 0 mph. So, the plane sits stationary as the conveyor belt goes by beneath it.

If the plane isn't moving, then the air isn't moving above and beneath the wing at the required 800 mph, thus creating no lift. And that's that.

**2manymustangs** · 01-22-2014, 04:00 PM

Originally Posted by Tishimself

Let's say for the sake of argument, that the engines on a jet propel it forward at 800 miles per hour (I have no idea how fast they really go, but bear with me here). Now imagine that the plane is sitting on a really long conveyor belt. Both the belt and the plane are stationary, and the jet engines are off. Now, imagine that the conveyor belt starts moving at 800 mph. Seeing that the plane's engines are off, the plane gets dragged backward at 800 mph by the belt.

Now, if the pilot fires up those engines, that 800 mph of force is only going to counteract the backwards-moving conveyor belt, right? 800 mph in one direction less 800 mph in the other direction equals 0 mph. So, the plane sits stationary as the conveyor belt goes by beneath it.

If the plane isn't moving, then the air isn't moving above and beneath the wing at the required 800 mph, thus creating no lift. And that's that.

It will take a fraction of the TOTAL thrust to stop the plane from moving backward and start moving forward... Do I have one mile? How long is your "really long conveyor belt"???

At 800 MPH backward I don't have very long before I'm in the abyss...

**Tishimself** · 01-22-2014, 04:26 PM

Originally Posted by 2manymustangs

It will take a fraction of the TOTAL thrust to stop the plane from moving backward and start moving forward... Do I have one mile? How long is your "really long conveyor belt"???

At 800 MPH backward I don't have very long before I'm in the abyss...

It never stated the length of it.

**2manymustangs** · 01-22-2014, 04:35 PM

Originally Posted by Tishimself

It never stated the length of it.

Lets say that the conveyor is an infinite length... Is it a hard surface or squishy like grass/dirt AND are the wheels on the aero-plane rigid or soft/pneumatic???

DO you dispute that the thrust will in short order overcome the rolling resistance (once you start spinning up the jet) and will cause enough thrust to stop the backward motion of the airplane?

**2manymustangs** · 01-22-2014, 04:54 PM

Originally Posted by 2manymustangs

Lets say that the conveyor is an infinite length... Is it a hard surface or squishy like grass/dirt AND are the wheels on the aero-plane rigid or soft/pneumatic???

DO you dispute that the thrust will in short order overcome the rolling resistance (once you start spinning up the jet) and will cause enough thrust to stop the backward motion of the airplane?

BUMP... Tishimself... CMon...