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Rotating Gear Wheels While Landing.no Rubber Burn?  
User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Posted (13 years 12 months 3 days 14 hours ago) and read 6314 times:

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

5 replies: All unread, jump to last
User currently offlineVirginFlyer From New Zealand, joined Sep 2000, 4652 posts, RR: 37
Reply 1, posted (13 years 12 months 3 days 13 hours ago) and read 6268 times:

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.


"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
User currently offlineSaxman66 From United States of America, joined Sep 2000, 518 posts, RR: 0
Reply 2, posted (13 years 12 months 3 days 12 hours ago) and read 6225 times:

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.

Ride Amtrak!
User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 3, posted (13 years 12 months 3 days 4 hours ago) and read 6164 times:

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"!
User currently offlineDuff From New Zealand, joined Oct 2001, 120 posts, RR: 1
Reply 4, posted (13 years 12 months 3 days 4 hours ago) and read 6152 times:

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.

User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3727 posts, RR: 32
Reply 5, posted (13 years 12 months 3 days 4 hours ago) and read 6149 times:
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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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