On 10/03/2015 02:50 PM, wrote:
On Tuesday, September 22, 2015 at 8:05:33 PM UTC-7, John B. wrote:
On Tue, 22 Sep 2015 13:00:59 -0700, The Real Bev
wrote:

On 09/20/2015 04:04 PM, wrote:

I could go into great detail about helmets since I started
learning about them as the Safety Director of the American
Federation of Motorcyclists about the time Bell started and I
had some long discussions with people at Bell. I am also an
engineer and a scientist. I wrote one of the few peer reviewed
papers on bicycle helmets.

Long ago I had/read a USAF publication about helmet design which
had a lot of useful/interesting information. I recently did a
google etc. search for it and turned up nothing. Did you ever
read that?

Out of curiosity, what was the U.S.A.F. publication about? The
usual pilot's, or air crew member's, helmet is more a matter of
holding all the things needed in proximity to the head and
protection from wind forces when ejecting, rather than falling off
:-)

Originally a helmet was designed to hold your microphone and
earphones. These were the old leather helmets.

Last time I looked at a J.C. Whitney catalog they were still selling
those. They were modeled by what looked like a chimp...

Later because of the
violent g-forces on planes newer than the P-40 they developed the
plastic helmets to keep you from injuring yourself from your head
slapping from side to side against the many protrusions.

I don't know their present design but I do remember them
experimenting with the helmet first strapped to your shoulders to
keep it rather straight, to a design of the seats headrest shaped to
receive the helmet and lock it more or less in place.

The main use is in combat with extreme g-forces so the pressures are
mainly side to side and USUALLY accelerative. But Aces used
deceleration to great advantage so they must have made some changes
for that.

When you are near or above the speed of sound and pull the throttles
back it feels like you hit a mountainside. Or so I'm told. I was a
bomber grunt.

Thanks for that.

A former boss flew transports and loved to tell the occasional female
passenger about the relief tube AFTER plying her with as much coffee as
she could hold.

--
Cheers, Bev
++++++++++++++++++++++++++++++++++++++
666øF -- the oven temperature for roast beast.