In aviation we use the square root of the tire pressure X 9 to get hydroplaning speed in knots. take times 1.16 for mph 48 year professional pilot In aviation we use the square root of the tire pressure X 9 to get hydroplaning speed in knots. take times 1.16 for mph 48 year professional pilot
Hydroplaning can occur when a car’s speed exceeds the water evacuation capacity of its tires, typically around 35-55 mph depending on tire tread depth and road conditions. Driving at speeds below this threshold and ensuring proper tire maintenance can reduce the risk of hydroplaning.
yes
Hydroplaning
The formula that is used to compute hydroplaning speed is: Minimum total hydroplaning speed (knots) equals 9 times the square root of tire inflation pressure (psi) or: V = 9 ÆP For the B-757 main wheels, the speed would be: 9 Æ144 = 108 knots
The speed increment that can make the difference between hydroplaning and not hydroplaning typically ranges from 30 to 35 miles per hour (48 to 56 kilometers per hour) on wet roads. Hydroplaning occurs when a vehicle's tires lose contact with the road surface due to water accumulation, and this risk increases significantly as speed rises. Maintaining lower speeds in wet conditions can help prevent hydroplaning, especially when water depth is greater than the tire tread depth.
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
Slower
lower
ture
Hydroplaning can occur at speeds as low as 35-45 mph in heavy rain or on wet roads with low tire traction. The risk of hydroplaning increases with higher speeds, worn tires, and improper tire pressure.
Hydroplaning is like water skiing. You need standing water on the roadway, not just moisture, and the necessary speed which is determined using tire pressure and math. The hydroplaning speed for tires at 32 psi is approximately 51 mph minimum. If you hit standing water at any speed other than a crawl you most likely will experience handling problems and possible loss of control.
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.