Re: Hans Device

["Ed Weldon" <23.weldon@comcast.net>]

Fascinating thread..........
Just an engineer's viewpoint here.  Keep in mind that the compressed gas in
an air cylinder will have a lot of "spring" and likely not much dampening.
Different than a liquid shock absorber that is virtually all dampening.
Exactly what combination of the two likely will depend on the travel
distance and how frequently you hit the "bumps".  Same general theory as an
auto suspension; but the "roadway" is a bit less predictable.
I wonder whether there's available any well reduced crash dummy data from
auto industry tests......"G" loadings and stuff like that.  Not that we
amateurs ought to be engineering this this hardware ourselves.  I wouldn't
be real interested in the testing phase......
Ed Weldon

----- Original Message ----- 
From: "Skip Higginbotham" <Saltrat@lubricationdynamics.com>
Subject: RE: Hans Device
> Good idea Neil....how about air cylinders. They are lighter and
> ........well think of a door closer. How would you hook it up?

> Skip
> >I wonder if the straps could be replaced with a couple of small valved
> >hydraulic cylinders. These "shock absorbers" would let a driver move his
> >head but they would resist sudden movement forward such as in a crash.
> >They would be velocity- sensitive and provide damping. Has anyone ever
> >explored this idea?.........Regards, Neil    Tucson, AZ