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Old 08 October 2008, 16:30   #41
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Oh I see. But could they have been hinged plates?
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Old 08 October 2008, 17:24   #42
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It's all looking rather fantasic.

Can't wait to see what the unholsterys going to be like.

One question. The two composite strips that join the upper seat to the base. Are these meant to bend or are they hinged on the brackets?
The carbon springs are purposely fixed, they twist slightly like an S shape ......the rear spring reloads them when they are getting abused ...

looking forward to finishing them cause i've got a boat to finish

cheers


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Old 08 October 2008, 18:39   #43
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good job as always! like the upper backrests! what sort of size did u decide on for backrest width.... my next job is to fabricate somet as i hate my seats and particualr upper support(or lack of)!
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Old 09 October 2008, 04:52   #44
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good job as always! like the upper backrests! what sort of size did u decide on for backrest width.... my next job is to fabricate somet as i hate my seats and particualr upper support(or lack of)!
The upper back support to me ages to work out what I wanted……if you look closely at the picture of the rear backrest you should see it taper out wider the higher it goes ….i studied as many high speed boat pictures as I could find and noticed all the racers etc upper body moved considerably more than the hip area …the taper was added to still allow for some slight movement just under the shoulder socket.
The seat base at the widest part on the rear is 400mm …the inner size of the lateral is also 400mm at its widest point …..this allows me to put in upto 50mm cushioning either side and still allow wet weather clothing. I am also looking at putting in airbag bladders on the laterals ….same as the new Audi R8 …. I have built the backrest to allow for movement but could be wrong in doing this …by having blow up bladders I can determine exactly how much movement (if any) I need
There is a lot of trial and error involved, the suspension parts I know work ….the backrest might work great but also might not work…. but is removable and its back to the drawing board ….Ullman has done a PHD on shock mitigation …..he hasn’t gone for laterals so there might be a reason not too that I have missed.
For the backrest I used 3 layers of fibreglass then used Kevlar hybrid ….I layed it out in the cross design …same as kart seats and formula 3000 …this gives considerable strength but allows flexibility …..also how many of us actually use the backrest …apart from handholds for rear passengers ……..most drivers and passengers will be in the slightly forward position holding steering wheels and handholds …this was the reason I went for a lower back support that will used and such deep laterals.

Speaking with JW last night and I think I should finish 2 ….fit and test then anything that needs changing I can do on the other 4 …..sounds like a plan!!!


Cheers


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Old 09 October 2008, 07:52   #45
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In our race seats we use Snap On crawl matt, it has excellant shock absorbing properties with zero bounce - nothing that can compare to these puppies though!
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Old 09 October 2008, 07:56   #46
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Can't Read Anymore Posts

I'm going to stop reading this thread.
I am just plain jealous of the amount and quality of the fittings that you are producing. Amazing Am I missing something
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Old 09 October 2008, 13:32   #47
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Am I missing something

gud luks, brayns, talunt, skil............i cud gow onn butt de bich sez dinna iz reddy


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Old 09 October 2008, 14:06   #48
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Old 10 October 2008, 10:28   #49
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In our race seats we use Snap On crawl matt, it has excellant shock absorbing properties with zero bounce - nothing that can compare to these puppies though!
can you explain what this is used for cookie?? the cushions??
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Old 10 October 2008, 14:00   #50
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.the lateral supports will have 50mm of memory foam wrapped around the inside for body protection ....the seat base itself will have 50mm foam outer areas just at the bum ....the centre of the seat will have 25mm foam in the bum base and around the leg area will be medical gel pads ....front wont get anything other than vinyl.
Ian
Outstanding bit of 'diy' - wish I could knock stuff of that quality up in the shed.

One thought on the memory foam angle (not quite sure if this is still in your plans or has been dropped) but a lot of this stuff seems to be very sensitive to temperature - moulds nicely at near body temp but is like a brick in the cold. Might be unpleasant on those cold mornings.
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