Poll

What position in an axial roll, does a drivers head generate the most velocity?  

sitting up
21 (100%)
laying prone on roll axis
0 (0%)
laying supine on roll axis
0 (0%)

Total Members Voted: 20

Voting closed: May 14, 2011, 12:59:03 PM

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Author Topic: Driver laying prone or sitting up in the cg of a vehicle  (Read 1751 times)

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Offline nebulous

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Driver laying prone or sitting up in the cg of a vehicle
« on: May 07, 2011, 12:59:03 PM »
Let your answer is based on the question only, not any other hypothetical situations involving specific vehicles,dimensions or speeds
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Offline iguana

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #1 on: May 07, 2011, 02:33:57 PM »
If the driver's head is on the roll axis, why make a distinction between prone and supine?

There may be other factors that ought to be considered, but strictly considering just the question, not sure there's a difference between second and third choices.
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Offline 64avanti

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #2 on: May 07, 2011, 02:41:14 PM »
The answer is simple.  The maximum forces are determined by how far the head is from the center of the rotation.  It is just a mater of physics.  If you are laying down and your head is near the roll axis then it doesn't make any difference if you are prone or supine if the distance from the roll axis is the same.
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Offline Dean Los Angeles

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #3 on: May 07, 2011, 02:49:06 PM »
I saw a clip years ago of a GT car that had spun and stopped over the crest of a hill. His team mate didn't see him and clipped the rear.

It was a really violent spin. He ended up with a broken jaw. There wasn't a mark on the helmet. They figured the centrifugal forces had broken his jaw.

I agree that there is no difference between second and third choices.

Let me guess, that was one of the factors outlawing 5050.
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Offline 64avanti

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #4 on: May 07, 2011, 02:52:34 PM »
Jack,

Now I understand the reasons behind your questions.  Can you explain why SCTA has declared your 5050 vehicle to be outlawed?  If it is posted somewhere else then point me there.

Are they concerned about the seat belt arrangement or something else?  If it is just the forces on your head in a roll or a tumble (end over end) then that can be calculated.  
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Offline dw230

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #5 on: May 08, 2011, 01:00:07 AM »
Love you Jack.

All you guys with under 100 posts go ahead and noodle this out.

DW

PS - try looking at 2011 rulebook(SCTA-BNI), page 120, 2nd paragraph.

DW
« Last Edit: May 08, 2011, 01:01:52 AM by dw230 »
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Offline joea

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Re: Driver laying prone or sitting up in the cg of a vehicle
« Reply #6 on: May 08, 2011, 05:48:55 PM »
dw..i know that Jack can meet the rules requirements...as he has
done for decades...

interestingly...that doesnt stop him from being banned...
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