Rear skid @ 201 feet....... - BMW Luxury Touring Community
 
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post #1 of 16 Old Apr 30th, 2008, 6:37 pm Thread Starter
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Rear skid @ 201 feet.......

Please do not try these at home.

I was asked to lay down a rear wheel only skid on my RTP, for a basic traffic homicide investigation school. Check out the rear tire, enjoy.

So..........for your math geeks etc..........how fast was I going??????????
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post #2 of 16 Old Apr 30th, 2008, 6:45 pm
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Re: Rear skid @ 201 feet.......

Damn fast!
What no ABS?

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post #3 of 16 Old Apr 30th, 2008, 6:49 pm
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by motorman587
Please do not try these at home.

I was asked to lay down a rear wheel only skid on my RTP, for a basic traffic homicide investigation school. Check out the rear tire, enjoy.

So..........for your math geeks etc..........how fast was I going??????????
Fuzzy math says .... 113mph with a 16mph tail wind

I will ask the same, Whats with the lack of ABS preventing you from doing this test ?

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post #4 of 16 Old Apr 30th, 2008, 6:57 pm
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Re: Rear skid @ 201 feet.......

Hey... How'd you get a picture of my tire?

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post #5 of 16 Old Apr 30th, 2008, 7:08 pm
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Re: Rear skid @ 201 feet.......

Would guess 55 - 60 MPH with no use of the front brake.

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post #6 of 16 Old Apr 30th, 2008, 8:05 pm
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Re: Rear skid @ 201 feet.......

My guess is 46mph.
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post #7 of 16 Old Apr 30th, 2008, 8:19 pm Thread Starter
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by bone1
My guess is 46mph.
Bone1.
You have the closes so far. It was 48 mph or there of, when I shut the key off. Again do not try this at home............

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post #8 of 16 Old Apr 30th, 2008, 9:37 pm
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by motorman587
Please do not try these at home.

I was asked to lay down a rear wheel only skid on my RTP, for a basic traffic homicide investigation school. Check out the rear tire, enjoy.
95% of the tire is still good.

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post #9 of 16 Old Apr 30th, 2008, 9:45 pm
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by motorman587
Please do not try these at home.

I was asked to lay down a rear wheel only skid on my RTP, for a basic traffic homicide investigation school. Check out the rear tire, enjoy.

So..........for your math geeks etc..........how fast was I going??????????
Simple, take the square root of 30xSxF
30= constant of gravity
S=skid distance
F=coefficient of friction.

Tom Lashbrook
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post #10 of 16 Old May 1st, 2008, 1:58 am
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by motorman587
Please do not try these at home.

I was asked to lay down a rear wheel only skid on my RTP, for a basic traffic homicide investigation school. Check out the rear tire, enjoy.

So..........for your math geeks etc..........how fast was I going??????????
With a velocity of 48MPH, and a skid of 201-ft, I get a coefficient of .39 or so. Must have been a smooth surface.

Tom Lashbrook
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post #11 of 16 Old May 1st, 2008, 5:34 am Thread Starter
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by tlash
With a velocity of 48MPH, and a skid of 201-ft, I get a coefficient of .39 or so. Must have been a smooth surface.
What % of braking did you use??? You must add that into the formula too. Also I skidded over two surfaces and the other was ruff, which is what ate the tire up so bad. The first surface was pretty smooth.

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post #12 of 16 Old May 1st, 2008, 5:40 am Thread Starter
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by tlash
Simple, take the square root of 30xSxF
30= constant of gravity
S=skid distance
F=coefficient of friction.
Use an F of .70 and braking of 30%, should get around 49'ish. I remember looking at the speed o at 48 mph still giving a little throttle before turning the key off.

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post #13 of 16 Old May 1st, 2008, 6:27 am
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Re: Rear skid @ 201 feet.......

All this "MATH" is makin my head hurt !!

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post #14 of 16 Old May 1st, 2008, 7:40 am
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Re: Rear skid @ 201 feet.......

Hey John,

I'd a told those dicks in Homicide to find another patsy or to go f**k themselves. "You want a skid, here's the keys" (if it was a department bike ).

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post #15 of 16 Old May 1st, 2008, 2:26 pm
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Re: Rear skid @ 201 feet.......

The Blueblitz template says about 50 MPH, given a drag factor of .70 on asphalt. Pretty accurate.

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post #16 of 16 Old May 1st, 2008, 3:18 pm Thread Starter
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Re: Rear skid @ 201 feet.......

Quote:
Originally Posted by Lonewuff
Hey John,

I'd a told those dicks in Homicide to find another patsy or to go f**k themselves. "You want a skid, here's the keys" (if it was a department bike ).
O-ya, it was a city bike and a city tire. Getting new one tomorrow.

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