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Re: [Land-speed] Head Restraints...another concept.

To: "'joseph lance'" <jolylance@earthlink.net>, "'Ed Weldon'"
Subject: Re: [Land-speed] Head Restraints...another concept.
From: <neil@dbelltech.com>
Date: Wed, 10 Sep 2008 09:18:39 -0700
Lance;

The body can stand high G forces but for only a very short duration. If the
G forces act over a longer time then the ability to withstand them becomes
greatly reduced.

Regards, Neil   Tucson, AZ


-----Original Message-----
From: land-speed-bounces+neil=dbelltech.com@autox.team.net
[mailto:land-speed-bounces+neil=dbelltech.com@autox.team.net] On Behalf Of
joseph lance
Sent: Tuesday, September 09, 2008 9:26 PM
To: Ed Weldon; drmayf@mayfco.com; LSR
Subject: Re: [Land-speed] Head Restraints...another concept.

This is an interesting subject. I don't have any direct LSR experience to 
contribute but it reminds me that NFL football players experience 
instantaneous impacts of 75 g or so.

Wonder what g-forces Bronko Nagurski experienced when he decked a horse or 
ran head first into that wall and cracked some bricks.

Lance

----- Original Message ----- 
From: "Ed Weldon" <23.weldon@comcast.net>
To: <drmayf@mayfco.com>; "LSR" <land-speed@autox.team.net>
Sent: Wednesday, September 10, 2008 12:06 AM
Subject: Re: [Land-speed] Head Restraints...another concept.


> Mayf-- I like your line of thinking.  Pick components from the mass
> production automotive technology we already have today.  The idea that the
> device should only be active under actual crash conditions and then
> automatically revert to passive or at least non-interfering afterward 
> makes
> a lot of sense for us as it did to automotive engineers many years ago 
> when
> they first started looking beyond simple seatbelts to improve vehicle
> safety.
> Do we really understand what forces, moments, impulses and accelerations 
> the
> head, neck and upper torso can tolerate?  That's probably the place to
> start.  There are beginnings of that in some of the device manufacturer's
> websites.
> This all sort of makes me wish I could be back in the working world with a
> budget to spend on R&D in this direction.
> Ed
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