A Riddle To Do Your Head In...

Post by **kazbah** » Mon Nov 28, 2005 11:22 am

I'm afraid I'd have to go with Ben on this one... If it were the other answer, how come countries pay big money to build runways when all they need is conveyors, same could be applied to aircraft carriers. They use a sling to propel the plane to a fast enough speed to get the air velocity right for take off.

ahew · Post by **ahew** » Mon Nov 28, 2005 11:25 am

if there was forward movement, would it be enough to create lift?

i admit, once the plane is off the ground then that's fair, it will move forward. but with 0 momentum, 0 acceleration, 0 relative speed, there is no way the baby will take off.

or, does lift get created by the actual jet / propeller? i thought these were just there for forward thrust (hehehe..) movement.

afterburner · Post by **afterburner** » Mon Nov 28, 2005 11:27 am

kazbah wrote:I'm afraid I'd have to go with Ben on this one... If it were the other answer, how come countries pay big money to build runways when all they need is conveyors, same could be applied to aircraft carriers. They use a sling to propel the plane to a fast enough speed to get the air velocity right for take off.

Because even under those 'other answers', the plane would still need a full length conveyer belt runway to take off anyway

As Ben mentions, it's all about airspeed over the wings, and the plane still needs to get that up to a set speed before it can lift off, no matter what's happening to the wheels.

Not to mention the physical contraints of building something that large

Edit: Woohoo I'm at the top of the 'Online Now' list - first time ever!

Post by **kazbah** » Mon Nov 28, 2005 11:45 am

Yes I was agreeing that it is all to do with air over the wing that allows the plane to take off... Maybe I just confused myself and everyone with my post

BTW Congrats on being No 1

ahew · Post by **ahew** » Mon Nov 28, 2005 12:13 pm

FTOs are cool.

scarecrow · Post by **scarecrow** » Mon Nov 28, 2005 12:13 pm

Benny, come on, your not paying enough attention. The plane does move forward! Exactly the same as it would on a normal runway, it does not simply stay in one place on the conveyor, it powers along it propelled by it's turbine engines. The plane would move forward, air would rush across its wings, it would take off.

The conveyors movement in the opposite direction of the planes forward momentum only spins the planes wheels, it does nothing to negate the momentum of the planes body!

Post by **Bennoz** » Mon Nov 28, 2005 12:14 pm

That would depend of the inertia of the 'cool' & velocity of the FTO

ahew · Post by **ahew** » Mon Nov 28, 2005 12:19 pm

does cool have friction? will an FTO create forward thrust from it's occupant?

this is an ambiguous statement that i have made... let's consult Dr. Karl.

Post by **kazbah** » Mon Nov 28, 2005 1:15 pm

ahew wrote:does cool have friction? will an FTO create forward thrust from it's occupant?

Only if they fart in it!

Post by **Bennoz** » Mon Nov 28, 2005 1:20 pm

Guilty as charged

Sounds good on leather thou

ahew · Post by **ahew** » Mon Nov 28, 2005 1:37 pm

hahaha...
sound is expended energy. that's why silent is more deadly.

AJ · Post by AJ » Mon Nov 28, 2005 1:46 pm

The plane will not take off. The engine is producing force in one direction, the treadmill is working in an equal and opposite direction, therefore the forces cancel each other out. The engines, no matter if jet or propeller have nothing to do with airflow over the wings. As a few people have mentioned, to create lift you need to pass air over a wing. If a plane was stood still and a big wind came towards it, it would lift of the ground (it would have to be a large wind mind) but in this case the plane would just be in the same spot on the run way. If you are on a treadmill at the gym and are running at 20 kms/h you do not get a breeze in your face. Try that outside and you can feel and hear wind in your face. You need air to flow over the wing to create lift. This does not happen on a treadmill.

ahew · Post by **ahew** » Mon Nov 28, 2005 1:50 pm

yes! i now have 3 people that agree with me.

Post by **Supplanter** » Mon Nov 28, 2005 4:55 pm

ahew wrote:FTOs are cool.

DAMNIT! ahew got the question right

scarecrow · Post by **scarecrow** » Mon Nov 28, 2005 5:42 pm

Oh my god.

How do you people manage to dress yourselves in the morning?

Post by **Bennoz** » Mon Nov 28, 2005 5:45 pm

scarecrow wrote:Oh my f**king god.

How do you people manage to dress yourselves in the morning?

With a chop stick & an intricate web of rubber bands

scarecrow · Post by **scarecrow** » Mon Nov 28, 2005 5:46 pm

Haha

It would actually be very cool if someone did ring up Karl and have an ask of the question. Only because I now need closure, hehe, stupid internet.

AJ · Post by AJ » Mon Nov 28, 2005 5:48 pm

Our mums dresses us. She turns our socks inside out and tucks a bit in so we can put them on in one go.

Post by **Supplanter** » Mon Nov 28, 2005 5:49 pm

scarecrow wrote:Oh my god.

How do you people manage to dress yourselves in the morning?

PFFFT they don't dress themselves

That's what they pay the trainee nurses at the "special" hospital to do.

Post by **Bennoz** » Mon Nov 28, 2005 5:54 pm

My nurse has a cold spoon

Oh ho....