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#1
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Trailer Tires Overheating.
Steven Shelikoff wrote:
The wheel. The area of the wheel exposed to the gas is so small compared to the area of the tire producing the heat that I doubt it has much of any practical value in dissipation of heat above and beyond air flow over and radiation from the tire itself. Though it doesn't apply much to boat trailer tires, the heat conductivity of the gas would work against tire cooling in the case of race cars and aircraft since it would serve to increase the rate of tire heating in heavy brake application. Many aircraft tire failures are due to overheated brakes, heating the wheels to the point of causing the tires to blow out or burn, not from heat generated by the tires themselves. Rick |
#2
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Trailer Tires Overheating.
On Mon, 03 Nov 2003 00:20:28 GMT, Rick wrote:
Steven Shelikoff wrote: The wheel. The area of the wheel exposed to the gas is so small compared to the area of the tire producing the heat that I doubt it has much of any practical value in dissipation of heat above and beyond air flow over and radiation from the tire itself. Actually, the area of the wheel exposed to the gas in a race car tire is pretty large compared to the area of the tire since they are wide and low profile. A narrow, high profile trailer tire doesn't have very much wheel exposed to the gas for the amount of tire area producing heat. Though it doesn't apply much to boat trailer tires, the heat conductivity of the gas would work against tire cooling in the case of race cars and aircraft since it would serve to increase the rate of tire heating in heavy brake application. Many aircraft tire failures are due Of course it all depends on the type of racing. During most racing like road racing, twisty corners, etc, heavy braking is applied but for very short durations. Superspeedway racing, not at all. There's plenty of cooling air ducted to the brakes and the rest of the suspension components can also act like a heat sink since they are directly attached to the brakes and wheel. On the other hand, the tires are always generating heat whenever the car is moving, and especially in turns. Heat is the enemy of tire life and whatever can be done to take away more heat from the tire will help. That being said, I sure wouldn't want hydrogen in my tires. to overheated brakes, heating the wheels to the point of causing the tires to blow out or burn, not from heat generated by the tires themselves. Slowing a 747 from 180 mph to taxi speed is hardly the same thing as bleeding off 40 or 50 mph from a super light race car. There's a whole different set of braking requirements, and aircraft brakes are in many cases under engineered since they depend so much on engine braking to slow down. Steve |
#3
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Trailer Tires Overheating.
Steven Shelikoff, the racing expert wrote:
Actually, the area of the wheel exposed to the gas in a race car tire is pretty large compared to the area of the tire since they are wide and low profile. Not in all types of racing. Actually, in some types, the narrower the better, less contact area, less friction. Take a salt flat racer, for instance. Though it doesn't apply much to boat trailer tires, the heat conductivity of the gas would work against tire cooling in the case of race cars and aircraft since it would serve to increase the rate of tire heating in heavy brake application. Many aircraft tire failures are due Of course it all depends on the type of racing. During most racing like road racing, twisty corners, etc, heavy braking is applied but for very short durations. Superspeedway racing, not at all. Are you really trying to say that on superspeedways, they don't use brakes at all? That's pretty stupid. They actually use brakes as opposed to letting off the throttle, trying to keep the enginer RPM's up. It takes forever to get those restictor plate engines back up to speed. They do, however, use completely different brake setups, smaller rotors, pads. These smaller, thinner rotors will get quite hot, quite quickly. There's plenty of cooling air ducted to the brakes and the rest of the suspension components can also act like a heat sink since they are directly attached to the brakes and wheel. On the other hand, the tires are always generating heat whenever the car is moving, and especially in turns. Heat is the enemy of tire life and whatever can be done to take away more heat from the tire will help. That being said, I sure wouldn't want hydrogen in my tires. Now that I can agree with. |
#4
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Trailer Tires Overheating.
"basskisser" wrote in message om... They actually use brakes as opposed to letting off the throttle, trying to keep the enginer RPM's up. It takes forever to get those restictor plate engines back up to speed. Can you explain that statement? Unless your referring to the go karts you rent at the amusment center I don't understand how you can maintain engine RPMs and slow the car down. Automatic transmission?? Hmmmm..... Seen it on off road cars, I wasn't aware of it being very common on any sort of track or pavement vehicles. Without some sort of a slip clutch or torque converter, the engine RPM is going to be directly related to the velocity of the car. Rod |
#5
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Trailer Tires Overheating.
"Rod McInnis" wrote in message ... "basskisser" wrote in message om... They actually use brakes as opposed to letting off the throttle, trying to keep the enginer RPM's up. It takes forever to get those restictor plate engines back up to speed. Can you explain that statement? Unless your referring to the go karts you rent at the amusment center I don't understand how you can maintain engine RPMs and slow the car down. Automatic transmission?? Hmmmm..... Seen it on off road cars, I wasn't aware of it being very common on any sort of track or pavement vehicles. Without some sort of a slip clutch or torque converter, the engine RPM is going to be directly related to the velocity of the car. Rod He is confused. Brakes are noy used at the 2 NASCAR restrictor plate tracks (Daytona & Talladega). They simply run wide open through the turns on these tracks since there is enough banking (30 degrees) that they do not have to back off at all. |
#6
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Trailer Tires Overheating.
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#8
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Trailer Tires Overheating.
"basskisser" wrote in message om... Pure horse****!!!!! They do, indeed, keep the throttle wide open, but they DO use the brakes, and quite a lot. They use the brakes as opposed to letting up on the throttle when drafting, to avoid loosing engine rpms from what is commonly refered to as "lifting". I ask you again: What type of connection do they use between the engine and the wheels that allows the engine RPMs to stay high while the car slows down? Rod |
#9
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Trailer Tires Overheating.
On Wed, 5 Nov 2003 11:11:13 -0800, "Rod McInnis"
wrote: "basskisser" wrote in message . com... Pure horse****!!!!! They do, indeed, keep the throttle wide open, but they DO use the brakes, and quite a lot. They use the brakes as opposed to letting up on the throttle when drafting, to avoid loosing engine rpms from what is commonly refered to as "lifting". I ask you again: What type of connection do they use between the engine and the wheels that allows the engine RPMs to stay high while the car slows down? He's full of crap as usual. They do use the brakes without lifting off the gas pedal but not to avoid loosing engine rpms. It avoids the short time lag in getting power back if you lift off the pedal. It also avoids abrupt changes in handling and suspension geometry that you get when you lift off the gas pedal, which shifts the front/rear weight distribution around. Steve |
#10
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Trailer Tires Overheating.
"Rod McInnis" wrote in message ...
"basskisser" wrote in message om... Pure horse****!!!!! They do, indeed, keep the throttle wide open, but they DO use the brakes, and quite a lot. They use the brakes as opposed to letting up on the throttle when drafting, to avoid loosing engine rpms from what is commonly refered to as "lifting". I ask you again: What type of connection do they use between the engine and the wheels that allows the engine RPMs to stay high while the car slows down? Rod It doesn't. What happens is that by not lifting the throttle, you are keeping the same amount of fuel/air ramming into the engine. So, what happens is that when you quit braking, the RPM's come back up quicker. You see, if you don't do that, with the restrictor plates, it can take up to a lap to get back up to full speed. So, when I say it is to avoid loosing RPM's, it really means loosing RPM's for a full lap, as opposed to a few seconds. It is a VERY common practice on superspeedways, and they all do it. It's just that Shelikoff doesn't know that. |
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