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Posted 16 November 2003 - 06:26 AM
Posted 16 November 2003 - 07:49 AM
BTW: I have found that tires start to hydroplane far before the tires reach the end of their life, usually about half way.
Posted 16 November 2003 - 08:15 AM
Posted 16 November 2003 - 10:53 AM
Posted 16 November 2003 - 11:17 AM
He might have been talking about viscoplaning - which is what we actually experience most of the time. Sliding on an ultra thin film of water.
I shall dig up the article from my extensive collection, and report back!
Posted 16 November 2003 - 04:18 PM
Dynamic Hydroplaning occurs when the speed is at least 8.73 times the square root of the tire pressure.
However, some other variables include Viscous hydroplaning and Reverted rubber hydroplaning.
But like Legacy777 says, this formula is only one part of the picture...because then I can take like 5000 PSI and never have to worry about hydroplaning. While I'm at it, forget the tires, I'll just run on solid metal rims.
P.S. According to the reference that I am using, this formula also applies to radial tires
Posted 17 November 2003 - 08:45 AM
Originally posted by Strakes
...because then I can take like 5000 PSI and never have to worry about hydroplaning. While I'm at it, forget the tires, I'll just run on solid metal rims.
that's what trains do. It'll work.
Posted 17 November 2003 - 10:32 AM
The faster you drive, the greater the risk of hydroplaning, since higher speeds allow less time for water to escape through the tread grooves. Shallower tread worsens that situation by allowing more water to stay beneath the tire. Our half-tread tires began to skim over the water’s surface at as slow as 40 mph in our hydroplane test, about 3 to 4 mph slower than the full-tread tires. As the chart in All-season-tire wear shows, that represents a nearly 8 percent drop in hydroplaning resistance compared with the same model tires when new.
This was very noticable on my Michelin X Ones ('97 OB wagon), which I just replaced with 60K miles despite significant tread remaining.
These tires when new were the best rain tires I'd ever had. But by last month I was hydroplaning at 65+ in heavy rain. Inflation pressure was 35 psi cold.
I replaced them with Michelin HydroEdge tires last week. With about 300 miles use they are noticalbly quieter and turn-in better than the X-Ones. It has not rained since I bought them, but by the end of the week I should have a rain report as well - maybe even snow.
Posted 18 November 2003 - 05:16 AM
Or, maybe they use the formula that has a multiplier of stupidity in it...
My formula is: If the road is pretty wet, slow down!
Posted 18 November 2003 - 08:06 AM
Have you noticed how many stretches have "110 bei nasse" signs? "70mph in the wet"
Watch out, the cops get really angry if you ignore these signs! Over 30km/h above the limit and your license is in serious danger.
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