Doug68
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 posted on 2/2/08 at 06:02 AM |
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Top harness mountings.
Hi All,
I'm thinking about how to mount the top harness eye-bolts. In common with GT40's I've got an engine immediately behind the roll bar and
don't want straps going into the engine area as that seems a recipe for disaster.
I'm also trying to achieve a flat face at the back of the roll frame to make it easier to mount the fire wall.
What you can see in the picture is the 44.5mm x 2.5mm DOM main loop and all the other tubes are 38mm x 2.5 DOM.
The intention is to put top-hat bosses into the horizontal tube and bolt up the eye bolt through that.
On the downside this leaves the threads taking all the applied load in a prang, which I'm not sure is a good idea?
Does anyone have any experience of doing something similar or other recommendations instead? Would this sort of arrangement be FIA sanctioned (I ask
that as they seem to have the highest standards)?
BTW I've also posted this question on GT40s.com for cross reference.
 
Rescued attachment SeatBeltMount.jpg
Doug. 1TG
Sports Car Builders WA
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Kaspa
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| posted on 2/2/08 at 06:06 AM |
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Hi Doug mate beleive or not they prefer to have the eye bolts mounted verticly with the bolt in shear,that way you can use an eye bolt or a flat
flange conector.
cheers Kaspa
understeer= when you hit the wall front first
oversteer=when you hit the wall back first
HP= how fast you hit the wall
Torque= how far the wall moves when you hit it
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Doug68
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| posted on 2/2/08 at 08:56 AM |
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If I go vertical with the bolt then they'll need to be upside down, I don't see why that'd be an issue, unless anyone knows better?
I think I could ditch the tube in between the cross braces too, again unless anyones got a good reason not to?
BTW its 37c outside right now so that's my excuse for not being in the shed right now.
[Edited on 2/2/08 by Doug68]
 
Rescued attachment SeatBeltMount.jpg
Doug. 1TG
Sports Car Builders WA
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Kaspa
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| posted on 2/2/08 at 09:09 AM |
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Doug just went through my NZMS book an it says nothing about having to have them top or bottom, just all the belt mounts shown on all cage plans are
vertical, so i very much doubt it would be a problem. i have the same dilema as you re the x brace so I'm just going to mount mine around the
horizontal tube, quite legal and acceptable.
kaspa
understeer= when you hit the wall front first
oversteer=when you hit the wall back first
HP= how fast you hit the wall
Torque= how far the wall moves when you hit it
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Doug68
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| posted on 2/2/08 at 09:51 AM |
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Yeah I've seen that method on race cars before and I think it'd actually be technically the best way to go.
However I've got grave doubts I could get it passed the Engineer & on the road if I did it like that.
Doug. 1TG
Sports Car Builders WA
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RazMan
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| posted on 2/2/08 at 10:29 AM |
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How about going the same way as I did? I have my harness fixings much lower (in the square section steel in your pic), looping the harness up and over
the round section toward the seat. No sticky out bits and Mr SVA loved it.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Doug68
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| posted on 2/2/08 at 12:13 PM |
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Not sure that'd help much as the situation down there is a bit more complex with sheet metal coming together and fastened to that square
section.
I'll shove a pic up in a bit with the sheet metal shown.
Doug. 1TG
Sports Car Builders WA
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Doug68
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| posted on 2/2/08 at 12:42 PM |
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I'm actually quite happy with this now unless anyone cares to shoot it down?
 
Rescued attachment SeatBeltMount.jpg
Doug. 1TG
Sports Car Builders WA
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Mr Whippy
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| posted on 2/2/08 at 06:25 PM |
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tube tube everywhere what a lot of tube 
Fame is when your old car is plastered all over the internet
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Doug68
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| posted on 2/2/08 at 11:49 PM |
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Western Australia's economy is largely Dependant on continued high demand for Iron Ore.
I'm just doing my bit to keep the economy going! 
Doug. 1TG
Sports Car Builders WA
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Mr Whippy
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| posted on 3/2/08 at 12:16 PM |
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quote:
Originally posted by Doug68
Western Australia's economy is largely Dependant on continued high demand for Iron Ore.
I'm just doing my bit to keep the economy going!
Fame is when your old car is plastered all over the internet
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..::Nightfire::..
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| posted on 4/2/08 at 01:35 PM |
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Why use eye bolts at all? Just wrap the harness around the tube and through a buckle?
Like this:
[Edited on 4/2/08 by ..::Nightfire::..]
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