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Old 24th Sep 2009, 20:32
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jcbmack
 
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You Are Mistaken; Please Read...Agaricus

A Hydroplane is a kind of speedboat. Did you by any chance mean to ask about "Aquaplaning"????

Hydroplane - Wikipedia, the free encyclopedia

Never mind. Accuracy has never been seen as particurlarly important on PPRuNe.
No!!! And wikipedia is not a legitimate resource anyways. Hydoplaning does refer to a speedboat at the surface of water; water has higher surface tension due to its hydrogen bonds and air water surface interface. The official term used for the "aquaplaning" of tires with water on a run way is also called hydroplaning. There are 3 types of hydoplaning which are as follows: dynamic, viscous and reverted rubber. Dynamic hydroplaning requires 0.1 of an inch or more of standing water onm the runway. Any of the following can worsen the hydroplaning issue: excessive tire wear tread, lack of depth groove, and tire, overinflation. In the airplane itself it feels like sliding and jerking, usually from side to side.
Viscous hydoplaning is believed to be the most common of the three types of hydroplaning. Viscous hydroplaning occurs on smooth runways or ones where there are rubber deposits, like in the touch down area.
Reverted rubber hydpoplaning require a wet runway and a skid in progress. This is due to brake lock and the heat produced by friction. In physics this is termed a form of balancing force. The heat is energy in transit due to temperature difference produced by the excitation of molecules by the force of friction.
The formula to determine the speed of an aircraft when hydroplaning is 8.6* the square root of the tire pressure measured in IB/in^2 (pounds per square inch) This equation gives you the lowest entry speed. However, the nosewheel and the main gear will begin hydroplaning at a different speed in knots. The best way to avoid hydoplaning is to touch down below the minimum recommended touchdown speeds if there is water on the runway. Once hydroplaning begins, it can continue below the minimum hydroplaning speeds.

Pilot's Encyclopedia of Aeronautical Knowledge is your friend while wikipedia is not...
Contaminated tires can be an often overlooked, but important issue.

Last edited by jcbmack; 24th Sep 2009 at 20:40. Reason: Title change
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