homebuilt safety

"Pete Schaefer" wrote in message
news:xMprc.4694$ny.935185@attbi_s53...

"anonymous coward" wrote in message
news
I imagine you would want something that would deform around (for the
sake
of argument) 10-20Gs.

Hmm....just shooting from the hip, that sounds like good range.

one's foot, so my worry is that if you used a foam that was soft enough
to
protect your back, it would be easy to put your foot or elbow through
it.

I'd think you'd put a covering of something rigid over it. Maybe a thin
layer of glass or maybe just some epoxy to make the top rigid enough to
prevent dinging it under normal use.

Behind the canard - in my dreams.

Maybe the thing to do is mount the seat to something that will give
somewhat
under crash loads. Might be hard in something like a Long/Vari-EZ, since
(I
think, working from memory here) that the EZ seat is mounted directly to
some major structural members. Would need some additional stuff to
isolate
the seat with some energy-absorbing stuff that would let it give a bit
(probably don't need more than a couple of inches in a crash).

I have heard that the racing drivers use alu honeycomb. That sounds like
it might be seriously expensive.

There's probably a ton of data on stuff that people have tried for driver
protection in the automotive world. Unfortunately, air-bags are out of
the
question for aviation use (for the pilot at least....probably for
everyone).
But there must be a ton of other stuff. I'd bet that NASA has sponsored a
bunch of research under the GA revitalization thingy that would be
applicable. Rather than us spend our time speculating here, maybe some
Google time is warranted. There is probably someone at NASA Langley that
would serve as a point of contact, too. There might even be some
technology
transfer programs around that we could take advantage of. Not sure how
they
would react to helping the average joe home-builder, but I'm sure they
make
a lot of data available to certified manufacturers.

Pete

It would be interesting to build a seat supported by empty aluminum soda
cans. A two-high stack would give a fair amount of deceleration space.
Calibrate for the load by the number of cans you use in parallel.
My experience crunching them for recycling has been that, undented, they're
very consistent in how they crush.
A poor man's honeycomb?

Tim Ward

On Fri, 21 May 2004 19:04:45 -0700, "Tim Ward"
wrote:

:
:It would be interesting to build a seat supported by empty aluminum soda
:cans. A two-high stack would give a fair amount of deceleration space.
:Calibrate for the load by the number of cans you use in parallel.
:My experience crunching them for recycling has been that, undented, they're
:very consistent in how they crush.
:A poor man's honeycomb?

I know one of the missionary flying groups makes seat supports out of
columns of rolled up corrugated cardboard - great energy absorbtion.
Low density urethane foam works nicely too - crushes and doesn't
rebound.

When I was in high school in the 70's in physics class we made a 10
mph bumper for a car out of full soda cans - the energy went into the
soda spraying sideways. Very messy, but lots of fun.