[Land-speed] Traction at Bonneville

[drmayf]

I did salt coefficient tests up there one year when I was just messing 
around. I made a test rig and I ran the test every 15 m inutes for an 
entire day. The 0.66 is pretty much what I got as well, mine was 0.68.  
I did find that it changed during the hday though. Satrting low getting 
better then going low then getting better then as the sun went down 
getting worse.  It was a double hump curve. HAd something to do with 
water percolation up with the heat and then druying out faster that it 
could pecolate then as  the wate rose, went down. SOme where I may have 
the data.  It just confirmed what was intuitively known.

mayf
Rick Byrnes wrote:

> Gee, it is interesting when someone actually tries to measure.
> Staggemeir and Eakers performed coastdown tests on the salt in I think 
> 88 and the data reportedly was something like   0.66  with good dry 
> concrete given at 1.0  Salt conditions were hard and dry. (I think)
> Physics hasn't changed in 21 years has it?
> Did I just say 21 years.  Man doesn't time fly when you are having 
> fun....
>
> Rick
> ----- Original Message ----- From: "Jim Dincau" <jdincau at qnet.com>
> To: "land Speed List" <land-speed at autox.team.net>
> Sent: Monday, September 14, 2009 2:51 PM
> Subject: [Land-speed] Traction at Bonneville
>
>
>> FWIW
>>     This year at Speedweek my brother made a rig to drag a piece of 
>> tire tread on the salt and measure the force required. He says;
>>
>>> From my testing, Bonneville traction is roughly 67% of dry concrete, 
>>> which
>>
>> is the same as dry Asphalt.
>>
>> Again your mileage may vary.
>> Jim in Palmdale _______________________________________________
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