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-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Mark Langford
Sent: Wednesday, June 23, 2004 8:52 PM
To: KRnet
Subject: KR> seat belts and spar strength (dead horse alert!)
NetHeads,
There has been a lot of talk about seat belt b
NetHeads,
There has been a lot of talk about seat belt brackets, bolt diameters, etc
lately. I just ordered my seat belts today from Hooker Harness, and have
been forced to think about attachment in order to come up with the proper
belt lengths. The thing that concerns me most is the strength of
breaks away.
KRron
- Original Message -
From: "Mark Langford"
To: "KRnet"
Sent: Wednesday, June 23, 2004 8:51 PM
Subject: KR> seat belts and spar strength (dead horse alert!)
> NetHeads,
>
> There has been a lot of talk about seat belt brackets, bolt
We assumed a 1" x
>1" piece of spruce with 4000 pounds (pilot and passenger) of force out in
>the middle of that 32" span, neglecting the upper cap, and the vertical
>members and plywood connecting them to the "subject" lower cap (somewhat
>conservative).
>Mark Langford,
>From what I've seen of the posts on KR2 accidents they virtually disintegrate,
>just like a crumple zone on a car, dissipating energy.
If you hit something hard enough to tear the belt mounts out then you'll
probably be nursing a very hot engine and have much shorter legs :-)
It's rare that an
Larry Flesner wrote:
> In my case, and most KR's, two brackets are attached near the vertical
> fuselage sides. That should cut the load in the center by one half.
Yes, we neglected those entirely, assuming that fuselage structure would
take care of that, like you say. We were concentrating on
Barry Kruyssen wrote:
> I wouldn't change from the plans.
And what do the plans say? I looked for seat belts last night and didn't
see it anywhere. I thought I'd seen someplace to just run a 3/16 bolt
throught the spar cap, period (although that may have been in an old
KRnewsletter, rather tha
If you're not worried about 20g crashes (and I'll admit
>that I'm not expecting one either), then don't sweat it. Larry's thin
>brackets and small bolts are probably all you need...
>Mark Langford,
+
Unfortunately, with seat belts, we bui
AM
> Subject: Re: KR> seat belts and spar strength
>
> Barry Kruyssen wrote:
>
> > I wouldn't change from the plans.
>
> And what do the plans say? I looked for seat belts last night and didn't
> see it anywhere. I thought I'd seen someplace to just run
krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of larry flesner
Sent: Wednesday, June 23, 2004 11:55 PM
To: KRnet
Subject: Re: KR> seat belts and spar strength
We assumed a 1" x
>1" piece of spruce with 4000 pounds (pilot and passenger) of force out in
>the middle
Larry
Like you I did not like the back rest belt area, so I used 10mm A/C ply for
the shelf, on two 3/4"spruce cross members, then on the double longerons,
where the 10mm ply is glued with T88. I put a 10mm ply webbing under those
longerons which tied them all together
I then placed 5/8"spruce from
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