Kind of hard to hydroplane in an FWD car - Saab 9-5 Bulletin Board - Saabnet.com
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Kind of hard to hydroplane in an FWD car
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Posted by Woody (more from Woody) on Fri, 8 Apr 2005 12:48:17 Share Post by Email
In Reply to: Hydroplaining, Ray Cosyn, Fri, 8 Apr 2005 11:48:04
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unless you are talking about hitting a puddle. The inability of FWD cars to hydroplane is a major safety factor of FWD over RWD.

Because rear wheels follow in the clean-swept track of the front wheels, hydroplaning always happens to the front wheels long before it happens to the rear wheels.

The instant a car gets going fast enough that the water doesn't have enough time to be pushed out from under the drive wheels, the drive wheels no longer have sufficient contact with the pavement to maintain the necessary speed to keep them floating on the water and the car slows.

In a RWD car, the car can continue to maintain hydroplane speed and even accelerate long after the front wheels are floating and have been hydroplaning and are unable to 'aim' the car. In an FWD car, however, the slow-down effect is instantaneous with the front wheels losing contact with the pavement and you never are able to sustain the hydroplane, and you always have control (unless the depth of the water on the roadway suddenly deepens).

If you sustained a long hydroplane in your Saab, it must have been because the water in the roadway suddenly became deeper than it had been. In that event, you'd hydroplane no matter what vehicle you were driving (assuming similar weight and speed).


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