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John Bolding
Joined: 23 May 2006
Posts: 281
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 Posted: Tue Oct 03, 2006 4:46 am Post subject: Seat belt attach |
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Subject: 701 seat belt attach points
| Quote: | From: george.mueller(at)aurora.org
Since I am in the process of installing 5 point Nascar type seat belts in
my 701 I am following with interest the discussion of the anchor points
on the seat tunnel. I was considering using the gear tunnel as an
alternate anchor point as is being done by John B. However, if you look
at the photos of Jon C's crash (thank you Jon for posting these on your
website, they contain very interesting information on a 701's
crashworthiness), you see that the main gear ended up several feet away
from the rest of the aircraft. Depending on how you attached the anchor
point to the gear tunnel, the departure of the main gear from the aircraft
could give you a tummy ache. John B., does your attachment point allow
the main gear to shear off without taking your attach point with it?
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George
Good point, you can't change something and always come out
for the better if you don't do your homework. You COULD make things worse.
I saw the gear leg departure as well and for that reason the new fittings
will
not interfere with the leg leaving the tunnel.
As long as we are discussing Jon's photos that he graciously shared ,
please note the side of the fuselage where the shoulder harness attaches.
It is crumpled and pulled inward what appears to be several inches, this
in my mind would facilitate a slack belt but I'm tackling one thing at a
time so to keep the domino effect down to a dull roar. I'm probably gonna
use a 4 point as that's what I've used on my other homebuilts and it kept me
outta the panel before. You are correct, the more points you have the lower
the load on any one point. There just aren't that many good places to
attach.
As long as we are discussing Jon's mishap, (Jon, don't you wish we'd leave
you alone)
the gear departure brought up another point that I had wondered about since
I first saw the plans.
The gear is attached with 4 bolts that are ground away 50% and then welded
to the attach fitting. Neither of those operations are conducive to
maintaining
high strength. Not suggesting a problem , just talking out loud.
Another way to skin that rabbit is to weld a short piece of bushing stock(
with same ID as the bolt OD) to the plate and drop in a virgin bolt to hold
the gear. I guess it can be argued either way . My preference would be to
keep as many of the big pieces attached for
as long as possible to help dissipate energy, rather than my tender,pink,
handsome
body. LOW&SLOW John Bolding
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lrm(at)skyhawg.com
Guest
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| Posted: Tue Oct 03, 2006 5:30 am Post subject: Seat belt attach |
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I haven't been following this discussion about the belts, just happened to
read this last one. So, I thought I would tell how I did mine. I also use
a four point system. Bolting the belts at each lower side of the seat
wasn't a problem, I used the standard Zenith attach points. It was the
inside bolt on the top that offered a little challenge. I made a "T" bar
out of 1/8' X 3" aluminum flat stock where one piece ran across the entire
width of the luggage compartment and the "T" joined it in the center then
went to the back of the compartment and I bent it up to hook around the end.
It's all riveted and bolted under the compartment. The outside top belt
bolts down next to the cabin wall and the inside bolts down thru the
compartment and the flat stock near the "T". I did away with the upper
Zenith attach point. Got my belts from Summit Racing.
Larry, N1345L, www.skyhawg.com
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john.marzulli(at)gmail.co
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| Posted: Tue Oct 03, 2006 11:57 am Post subject: Seat belt attach |
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With all this talk about the gear protruding into the cabin, I have to wonder how a float/amphib setup would react differently.
Does anyone have some ideas?
Thanks
On 10/3/06, LRM <lrm(at)skyhawg.com (lrm(at)skyhawg.com)> wrote:[quote] --> Zenith-List message posted by: "LRM" <lrm(at)skyhawg.com (lrm(at)skyhawg.com)>
I haven't been following this discussion about the belts, just happened to
read this last one. So, I thought I would tell how I did mine. I also use
a four point system. Bolting the belts at each lower side of the seat
wasn't a problem, I used the standard Zenith attach points. It was the
inside bolt on the top that offered a little challenge. I made a "T" bar
out of 1/8' X 3" aluminum flat stock where one piece ran across the entire
width of the luggage compartment and the "T" joined it in the center then
went to the back of the compartment and I bent it up to hook around the end.
It's all riveted and bolted under the compartment. The outside top belt
bolts down next to the cabin wall and the inside bolts down thru the
compartment and the flat stock near the "T". I did away with the upper
Zenith attach point. Got my belts from Summit Racing.
Larry, N1345L, www.skyhawg.com
---
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