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Old 09-01-2004, 07:25 PM
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Move Over Enzo, Guess Who Is Getting Carbon Brakes?



9/1/2004 - EDWARDS AIR FORCE BASE, Calif. (AFPN) -- Initial KC-135 Stratotanker carbon brake testing here discovered an increased operational capability over currently used steel brakes.

Test team experts, using a KC-135R from the Alaska Air National Guard, found carbon brakes stopped the aircraft in a shorter distance, allowing the tanker to take off with heavier loads and operate on shorter runways.

Among the carbon brakes' benefits include increasing the lifespan of the brakes to 1,000 landings from a previous 100 landings with the steel brakes, Mr. Hamilton said. The increased lifespan reduces costs of changing out brakes on the aircraft's 18 wheels every 100 landings.

The carbon brakes also performed well on medium to high risk testing, experts said. The test experts stopped a heavy, fast-moving tanker in a short distance, putting a lot of energy on the brakes and generating high temperatures.

"High-brake temperatures heat the air inside the tire, causing the air to expand," said Dave Benson, another flight test engineer. "If the air expands beyond what the tire can hold, the tire and wheel can explode like a balloon. Fuse plugs release at certain temperatures, letting air out of the tire to avoid overheating, and the end result is just a flat tire, not an exploded tire and wheel."

During the highest energy test, test experts were able to stop and taxi 4,000 feet before the fuse plugs released, he said.

Rumors of the AF testing "spinners" were denied.
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Old 09-01-2004, 07:36 PM
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Quote:
Originally Posted by MTI
Among the carbon brakes' benefits include increasing the lifespan of the brakes to 1,000 landings from a previous 100 landings with the steel brakes, Mr. Hamilton said. The increased lifespan reduces costs of changing out brakes on the aircraft's 18 wheels every 100 landings.
That's really cool, except for the fact that the KC-135/707 only has 10 wheels. I think the reporter got confused, as the VC-25/747 has 18 wheels (two extra sets of "bogey" wheels in the rear)...
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Old 09-01-2004, 07:52 PM
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Too bad about the spinners. That would be pimpin'.
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Old 09-01-2004, 08:23 PM
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Also using carbon brakes are all current production Airbus families, Boeing 747-400, 777, 757-300 and current production 767 aircraft. Carbon brakes on aircraft are nothing new. They are used mainly because they have higher operating temperatures and lower weight. During rejected takeoff testing on aircraft, temperatures can reach 5,000 degrees ferenheight.

When did the KC-135 grow the extra wheels?
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Old 09-02-2004, 05:59 AM
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So if we use them enough, putting enough pressure on them and generating enough heat, can we make diamonds at the same time? Brakes that pay for themselves!
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