The conveyor belt thread.

[Gelsons Dad]

What was the aeroplanes air speed?
An aircraft flies through air.

 

[Blue Mist]

Interesting one this, posters on another forum almost came to virtual blows discussing it...:).

Really? It seems pretty self evident to me. I don't see where the area for debate is.

How can you come to blows on an internet forum ? Perhaps they type `I have just thumped you` and the other 'feels' the pain.

I think the Op has been on fizzy vimto.

 

[flyer]

The plane would definitely take off as the thrust forward comes from the engines and not from the wheels. The engines and wings are travelling at 180mph (or whatever) which enables take off.

All that the conveyor belt does is increase the speed of the wheels going around so that as the plane reaches 180mph the wheels are doing 360mph.

The plane does not rely on the wheels for forward thrust so therefore takes off

 

[Barcon]

Plane would not take off as it would still be stationary. The plane needs the incoming air to pass over/under the wings to give it lift. There was a mythbusters episode about this very thing.

How can it be stationary if it's travelling at 180mph? Either it's travelling, or it's stationary.

If the plane was stationary on the belt it would be going backwards at 180mph, so it travels against the conveyer belt at 180mph, ergo it is stationary, would need to travel at 360mph on the conveyor belt to reach take off speed (assuming in this instance it is 180mph).

The plane is not stationary in the question. It is travelling at 180mph. How fast would it be going if it wasn't on a conveyor belt travelling at 180mph in the opposite direction? Can a plane take off if it's travelling at 180mph is the question.

 

[BigJoe#1]

What was the aeroplanes air speed?
An aircraft flies through air.

Can aeroplanes fly backwards....no, therefore given the plans is on the conveyor (ergo on the deck) belt it needs to travel at +180mph from a starting point of travelling -180mph...., therefore to counter the negative (going backwards on the conveyor belt) it needs go travel at 360mph

Where has the "which would bend easier" thread gone?

 

[Gaylord du Bois]

How far would I land from my original position if I were to jump 2 feet in the air on a train I'm travelling on at 200mph?

 

[ColinBellsjockstrap]

Interesting one this, posters on another forum almost came to virtual blows discussing it...:).

Really? It seems pretty self evident to me. I don't see where the area for debate is.

How can you come to blows on an internet forum ? Perhaps they type `I have just thumped you` and the other 'feels' the pain.

I think the Op has been on fizzy vimto.

 

[Gelsons Dad]

What was the aeroplanes air speed?
An aircraft flies through air.

Can aeroplanes fly backwards....no, therefore given the plans is on the conveyor (ergo on the deck) belt it needs to travel at +180mph from a starting point of travelling -180mph...., therefore to counter the negative (going backwards on the conveyor belt) it needs go travel at 360mph

Where has the "which would bend easier" thread gone?

No. As flyer pointed out above an aircraft relies on thrust not traction from its wheels.

The question is ambiguous because the "speed" is not qualified. Is it wheel speed? Speed relative to the conveyor belt? Relative to the ground? Or the air?

 

[burning blue soul]

flight relies on 4 principles
1. weight
2. drag
3. lift
4. thrust

in this scenario the air craft is not moving at all. the ground is moving at 180mph against the thrust of the 180mph engines.

there would be no lift generated by the air speed that taking off relies upon.

therefore the plane would not take off.

 

[BlueBearBoots]

Kudos to the guy that invented a conveyor belt that travels at 180mph