Jumpy Guy
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| posted on 27/8/03 at 10:05 AM |
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Harness mounting positions - again..!!
I know its been done before, but I cant find a definitive answer, and since the SVA book is out of circulation at the moment, its down to you
guys...
I intend to mount my four point harnesses, top mounts, on the horizontal chassis rail behind the seats, passing the harness through the harness holes
in the seats.
Is this OK? the mounts will be low, but my understanding is that the harness holes in the bucket seats is the relevant point?
any opinions?
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Simon
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| posted on 27/8/03 at 01:59 PM |
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JG
I emailed Cobra Seats about this very point, and was going to post his reply - but can't find it. Typical.
Anyway, the g(j)ist of it (IIRC) was that that was what most people do (his mate had just passed his SVA with same set up), and FYI it's what
I'm doing (me that is, not the chap from Cobra!!).
The SVA Manual (and anybody with a book to hand care to correct me) states that the angle of the harness straps from tube "O"
(that's the one to which you refer I believe), though harness holes should not be greater than 45 degrees.
HTH at bit.
ATB
Simon
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JoelP
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| posted on 27/8/03 at 04:56 PM |
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quote:
Originally posted by Simon
JG
The SVA Manual (and anybody with a book to hand care to correct me) states that the angle of the harness straps from tube "O"
(that's the one to which you refer I believe), though harness holes should not be greater than 45 degrees.
Simon
Do you mean not more than 45 degrees down? or left right? I had assumed they had to be more level (ie less than 45) but it would be good to know for
sure. This would reduce downward force on the seat in a bump (as you go forward), which sort of makes sense.
Im using a 4 point seat, do the bottom straps just go to the bottom rail behind the seat?
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Jumpy Guy
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| posted on 27/8/03 at 07:21 PM |
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That was my next question!
I had thouht of mounting onto a handy bit of chassis!
Is there a minimum thickness of metal that the bottom harness mounts can be mounted onto?
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Rorty
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| posted on 28/8/03 at 07:05 AM |
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Harness fixing points are universal now in motorsport internationally.
The shoulder belts should point backwards and downwards at an angle of about 45 degrees after they leave your shoulders. This is imperative, as if the
belts continue on an upward path from your shoulders, you stand a very good chance of being injured in a crash.
The lap belts should be anchored behind theseat at floor level. The crotch strap (of 5 or 6 point harnesses) should also be attached behind the point
it enters the seat.
I would be very surprised if SVA would differ.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Simon
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| posted on 28/8/03 at 09:15 AM |
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JG/Joel,
My lap belts are bolted to triangular shaped 4mm plate fully welded (both sides) to the floor and penultimate rearmost upright chassis tubes. Might be
worth also noting that the uprights to which the 4mm plate are welded to are attached to the rear most upright tubes by seam welded sheet. Have a look
at:
http://forum.locostbuilders.co.uk/xmb/photos/cgi-bin/showpic.pl?10000059.jpg
and you'll see what I mean.
You should find complete fitting instructions included with your harnesses.
The SVA manual shows (via piccies) the parts on a 7 esque chassis that are acceptable for mounting your harnesses.
As for the shoulder straps, Rorty has explained it better than I.
ATB
Simon
[Edited on 28/8/03 by Simon]
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Jumpy Guy
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 posted on 28/8/03 at 09:37 AM |
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Thanks guys, thats a lot of help
But I dont have a SVA manual, and cant buy one anywhere! as discussed on previous threads, its out of print at the moment.....
If some kind soul could scan the pictures, that show these mounting points , it'd be much appreciated!?
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Rob Lane
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| posted on 28/8/03 at 03:23 PM |
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Try http://www.jpmast.nl/svaChapters.htm for your info.
It's the SVA manual online.
Rob Lane
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JoelP
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| posted on 28/8/03 at 04:15 PM |
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That website says (i think) that the rear top mounting must be more then 50cm above a reference point (your bum), and that all mounting points must be
suitably strong, ie braced and triangulated etc.
Is this a good summary or have i missed something?
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