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Rotating Gear Wheels While Landing.no Rubber Burn?

Tue Jun 04, 2002 8:49 am

hi everyone. i've always thought that it would reduce the rubber-burn cost on each landing every plane makes: setting a kind of engine that can rotate the wheel to the same speed the aircraft is flying.
the technique would be one engine for the left main gear, so with a chain it could move as many wheels the column would have, another one in the right main gear, and a last one in the nose gear.
In light that the average time a wheel can land, about 10 landings, this technique would improve the durability of each wheel on an aircraft.
i know that everything is already thought, already invented, and already discussed, since i'm talking about an industry that every technical matter is involved.
would it add more weight to the airplane ?, so might be there any chance of less passengers?, and in fact, less profit for the airline by setting those engines in the landing gear?
is just a matter of cost-benefit that is not necessary 'cause replacing a wheel each 10 landings, is cheaper than investing in a couple of engines to the landing gear ?
i don't know, hope you reply me with your ideas, or juist any reason to explainme why it doesnt exist in the airline industry.

jgore  Smile
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RE: Rotating Gear Wheels While Landing.no Rubber B

Tue Jun 04, 2002 10:10 am

Wheels replaced every 10 landings? Are you sure of those figures???

The idea seems overly complicated - it would be prone to technical failures, it would require maintenance, it would add weight, it would increase the drain on electricity (and thus increase fuel usage). It would be more trouble than its worth.

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RE: Rotating Gear Wheels While Landing.no Rubber B

Tue Jun 04, 2002 11:34 am

I think a wheel can stand more then ten landings. Motors would cost too much and add weight. Plus you'd have to have the wheels going as fast as the ground speed or else they wouldn't do much good.
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RE: Rotating Gear Wheels While Landing.no Rubber Burn?

Tue Jun 04, 2002 6:49 pm

Our MD-80's in SAS average about 80 landings per tire.
This idea has been tested in the early fifties.They used vanes on the hub to allow the airstream to rotate the tires during approach.The plane in question was the B-36 prototype with single tire mainwheels.Problem was that the rotating tires created gyroscopic forces because of their huge size.On the bogies that replaced the single wheel installation,it was thought that the rear wheels would not receive enough airflow so the idea was dropped altogether.
On present day jetliners,the ground spoilers activate by wheel spin-up on touchdown and /or weight on wheels.Rotating the wheels in the air prior to touchdown would remove the first means of spoiler activation,the plane relying on weight on wheels only.And if that ground shift mechanism fails,well.....
"Luck and superstition wins all the time"!
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RE: Rotating Gear Wheels While Landing.no Rubber Burn?

Tue Jun 04, 2002 7:05 pm

It has already been thought of. However, it was quashed because the wheels are unable to penetrate water or any other runway contamitants. The wheels were prone to aquaplane. That is one reason. I am sure there are others.
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RE: Rotating Gear Wheels While Landing.no Rubber Burn?

Tue Jun 04, 2002 7:17 pm

Although this is now a dual post as it has been moved from the CA forum I will leave it up but archived due to the responses this post has already attracted.

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