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How can you determine at what speed a car will hydroplane?

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2015-07-15 18:29:08
2015-07-15 18:29:08

There are too many variables that affect automobile hydroplaning speed such as weight, tire pressure, tire tread design, tire wear, road surface, road condition (i.e., depth of contaminating snow, slush water, etc.) and so forth to be able to develop a valid, useful formula. However, with respect to airplanes where runway surface conditions, tire tread, tire pressure, and other factors are maintained to a more consistent standard, the generally accepted rule of thumb is 9 times the Square root of the tire pressure. For example, if the nosewheel tire pressure is 90 lbs., the square root would be 9.5, which, if you multiply by 9, would give you an expected nosewheel hydroplaning speed of 85.5 nmph. Obviously, automobile hydroplaning speeds would be much lower than that. According to testing cited by the NTSB, the speed at which hydroplaning can be expected to occur in a vehicle is 10.35 x square root of the tire pressure.

:It is about 30-45 mph. When I drive in rain I'm always super careful.

That's incorrect, hydroplaning can occur at any speed when your tires do not have direct contact with the road surface.

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Related Questions


When I am in my car and it is raining I might hydroplane.

Tires can hydroplane as low as 40 mph if conditions are right.

Look at the speedometer.

No certain speed, depends on the tread, width and inflation of the tires. Never drive too fast for road conditions.Wide tires will hydroplane before narrower ones will.

Remove you foot from the accelerator, hang on to the steering wheel, do not apply the brakes, do not turn the steering wheel, and pray. If your car is in a "hydroplane", you should: -Ease off the accelerator

Speed costs...how fast do you want to go?

not at all high. 1/2 inch or even less can hydroplane a car. all it means is that the vehicles tires are not spreading the water out or shedding it away from under the tire and is instead riding on top of it due to speed and condition of the tire. Once the car is riding on top of the film of water control is compromised and braking ability diminished.

The FAA did a lot of work to determine the factors involved in hydroplaning. Their testing showed that the speed at which hydroplaning can occur depends upon the air pressure in the tires. The formula is V = 9 * Sqrt(Pressure) where V is speed in MPH and Pressure is in PSI If you add weight but don't add air, the tire will compress, which causes tire pressure to go up, increasing the hydroplane speed. ref http://www.sheldonbrown.com/tires.html#tread

Quite easily, often in much less. It depends on the speed, weight of the vehicle, type and condition of the tyres.

A beam of electromagnetic waves is bounced off the car

Yes, combined with worn tires and vehicle speed.

There are no perfect rhymes for the word hydroplane.

A car can hydroplane, essentially glide on water

Possibly so. You must drive at the speed the conditions warrant. You can be sited for not doing so and if you have an accident and it is determined you exceeded the speed limit in the said conditions I would assume you will be faulted.

what is the prefix root of the word hydroplane

A hydroplane is a speedboat, not an airplane.

Yes. Any wheeled vehicle will with enough water on the road and enough speed.

Speedometer can determine a car's normal and maximum speed.

Yes, the faster you go the more likely you will hydroplane, especially if the tires are worn.

Only if the grating is submerged under a couple of inches of water.

Hydroplaning is caused by a combination of the conditions below:vehicle speedTyre profile, tread type and depthwater depthsurface conditionsWith speed being the biggest culprit. Go too fast and and eventually every tyre will hydroplane, go slow enough and you'll never hydroplane.


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