Thanks Jim, I'll forward this message to Mr Mayfield and the group.
-----Original Message-----
From: jim@phelpsgroup.com <jim@phelpsgroup.com>
To: Daniel Warner <dwarner@electrorent.com>
Date: Friday, June 11, 1999 1:56 PM
Subject: Re: Fw: Rules Question - Crotch Strap.
Hi Dan-
To answer the question, look at drawings 6, 7 ,8. The only crotch strap that
is
parallel is in 6. That is where the guy is sitting almost straight up. The
driver will not submarine when his back is close to 90° to his thighs.In 7,
8
they are pulled under the NHRA way.
The drawings evolved with the help of Jimmy Diest and Jack Dolan. I was told
that if you're sitting upright you don't really submarine. The major forces
will
be absorbed with your shoulders and lap belt. When you start the lay back
stuff
you will tend to slide underthe lap belt. It was also mentioned that if it
was
pulled under in 6 it could cause some problems with your private parts.
Note also that the drawings shows a 6-point harness like in Rich's car. With
this all the crotch strap dous is keep the shoulder belts thght on your
shoulder.
If Mr. Mayfield wants to do it the NHRA way its ok. All I really look for is
that they have one and it is mounted solidly and would work if it has to
without
causing to much driver pain.
Hope this answers your question.
Jim
___
Subject: Fw: Rules Question - Crotch Strap.
From: "Daniel Warner" <dwarner@electrorent.com> at inet
Date: 6/11/99 5:29 AM
Jim,
What are you thoughts on this. I used to think we were the same as NHRA,
same pics.
-----Original Message-----
From: Lawrence E. Mayfield <mayfield@traveller.com>
To: land-speed@autox.team.net <land-speed@autox.team.net>
Date: Thursday, June 10, 1999 3:45 PM
Subject: Rules Question - Crotch Strap.
>In the SCTA rule book regarding recommended seat belt mountings, see
>figures 6,7,and 8 of III-4.1, the crotch strap is required to be parallel
>with the body line. In the NHRA rule book, crotch straps are to be mounted
>behind the chest line. Both methods are to prevent the driver from
>submarining during a frontal crash.
>
>My question is this: Which is the best method? Since my car will be a dual
>purpose car, occasionally running drag events, I need to be compliant with
>both systems. My thoughts are that the NHRA method is superior since it
>puts less load on the strap during a wreck than the SCTA method.
>
>Any thoughts as to what I should do?
>
>mayf
>
>
>
>L.E. Mayfield
>124 Maximillion Drive
>Madison, Al. 35758-8171
>1-256-837-1051
>
>http://www.hsv.tis.net/~mayfield
>
>DrMayf@AOL.com
>mayfield@traveller.com <<<<preferred
>
>
>Bonneville Land Speed Racer, '66 Hydroplane Drag Boat (390 FE)
>
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