Re: First the basics folks - Saab 9-5 Bulletin Board - Saabnet.com
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Re: First the basics folks
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Posted by Andrej (more from Andrej) on Fri, 8 Apr 2005 20:59:43 Share Post by Email
In Reply to: First the basics folks, Rick Coffman, Fri, 8 Apr 2005 18:11:02
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Tires do play the single largest part in hydroplaning behavior, but it is not as simple as contact patch area. Witness the difference between a skinny, high-profile tire and a wide, low-profile one: the former has a long, narrow rectangular contact patch, while the latter has one closer to a square in proportion. All things being equal, the narrow tire will be better in deep water because the water has less distance to cover between the centerline and the edge. Running at higher pressures just makes the tire tread in contact with the road effectively narrower, as it causes radial tires to bulge along the centerline.

The relationship between weight and hydroplaning you mention does not make sense to me. The tire is not deforming due to pressure, but rather the amount of water under the contact patch has exceeded the capability of the tire tread to deflect it and the water forms a layer between the tire and the road. A heavier car has more weight on the front tires, thus more downward force to counteract this. A heavy FWD car on narrow tires is going to have considerably better hydroplaning resistance than a light RWD car on wide tires with the same tread pattern and pressure.

Quote from Fred Puhn, _How to Make Your Car Handle_, HPBooks, 1981, p.122: "Even though you can gain traction with the widest tread, there are reasons for selecting a narrower tire. An important reason is wet-weather traction. A wide tire has a problem known as hydroplaning. Hydroplaning is where water is forced between the tire and the road, lifting the tire up on a fluid wedge. This totally destroys traction, and the car usually goes out of control. Wide tires, a light car, fast driving, and deep water are the worst combination."



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