Bare
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| posted on 22/5/11 at 06:27 PM |
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Hold on a momenrt. Yes the cutting of the trans tunnel tubes certainly looks 'problematic'
But wasn't there a Structural analysis done on a Locost chassis as a Graduate Engineering Thesis.
Available .still.. onna "net'....that suggested that removing the entire trans tunnel tube labyrinth had NO effect on structural
rigidity , Either in torsion OR bending ??
It's decorative Kids.. a bit of design work done by intuition.. Not structural testing
Best read up on this... just to be sure.. either way :-)
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Tilo
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| posted on 22/5/11 at 07:26 PM |
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Take a look at these...
How will it it fold forwards!? In case of collision it will hold me against the seat and press down, as in any other car...
www.lusitanamotorcompany.com
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Tilo
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| posted on 22/5/11 at 07:28 PM |
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quote:
Originally posted by Bare
Hold on a momenrt. Yes the cutting of the trans tunnel tubes certainly looks 'problematic'
But wasn't there a Structural analysis done on a Locost chassis as a Graduate Engineering Thesis.
Available .still.. onna "net'....that suggested that removing the entire trans tunnel tube labyrinth had NO effect on structural
rigidity , Either in torsion OR bending ??
It's decorative Kids.. a bit of design work done by intuition.. Not structural testing
Best read up on this... just to be sure.. either way :-)
I AGREE! It not that important, never the less, they are going back in because I need something to mount the handbrake and to rest my arm while
driving... 
www.lusitanamotorcompany.com
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Ben_Copeland
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| posted on 22/5/11 at 07:49 PM |
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quote:
Originally posted by Tilo
Take a look at these...
How will it it fold forwards!? In case of collision it will hold me against the seat and press down, as in any other car...
In everyother car they are mounted the something structural. Your seat is NOT!!
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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Tilo
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| posted on 22/5/11 at 07:57 PM |
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quote:
Originally posted by Ben_Copeland
quote:
Originally posted by Tilo
Take a look at these...
How will it it fold forwards!? In case of collision it will hold me against the seat and press down, as in any other car...
In everyother car they are mounted the something structural. Your seat is NOT!!
Sorry, I don't get your point... The seat is attached to the rails and the rails to the chassi, from what I know that's the way
they're built in most cars (if not all). The seat belt is anchored to the chassi in two points and the third point is the buckle which is
attached to the seat. In some cars there are two anchored points to the seat (the buckle and the end of the belt) and just one to the chassi.
www.lusitanamotorcompany.com
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scootz
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| posted on 22/5/11 at 08:02 PM |
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It's not the belt mounts on the rails Ben's talking about, it's the sub-mounts you have on the shoulder areas of the seat.
In a significant impact your weight will be thrown forward pulling the belt tight. As this happens a force will be exerted on the sub-mounts on the
seat shoulder. I'd imagine that this force would cause the shoulder area of the seat to collapse and the headrest would slap into the back of
your head. It would also mean that you will travel further forward towards the steering wheel.
A terrible idea in my opinion.
It's Evolution Baby!
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Steve Hignett
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| posted on 22/5/11 at 08:14 PM |
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As above (and above etc etc) where everyone is warning you of a dangerous design.
Your weight on the belt (in a crash) will be like spreading the base of a triangle open. This will mean that the amount of load needed to crush the
seat (where your using it as a seatbelt guide) and fold it down will be less than normal - and also lengthening the belt, allowing you to travel
further forward and also potentially allowing the seat back to strike you.
As for someone's comments above regarding the strength of the tunnel (which you agreed to) - I'm not 100% sure as I think I last read it a
lot of years ago, but I believe that was where the analysis describes no losses in structural rigidity with the removal of the tunnel was in reference
to the fact that certain tubes could be cut out. In fact I think it went on to say that if manufactured from a sheet of steel (even thin stuff) and
therefore a monocoque structure, it could actually be improved upon...
Just out of interest, who has cut your prop down and rewelded it? (The portion near to your legs and internal organs)
[Edited on 22/5/11 by Steve Hignett]
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Ben_Copeland
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| posted on 22/5/11 at 08:15 PM |
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quote:
Originally posted by scootz
It's not the belt mounts on the rails Ben's talking about, it's the sub-mounts you have on the shoulder areas of the seat.
In a significant impact your weight will be thrown forward pulling the belt tight. As this happens a force will be exerted on the sub-mounts on the
seat shoulder. I'd imagine that this force would cause the shoulder area of the seat to collapse and the headrest would slap into the back of
your head. It would also mean that you will travel further forward towards the steering wheel.
A terrible idea in my opinion.
Exactly.
I'm also worried about your prop, if it was done in the same style as your seat.
[Edited on 22/5/11 by Ben_Copeland]
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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Tilo
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| posted on 22/5/11 at 09:14 PM |
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What do you think if I invert the mount strap, turn it upside down? Instead of bolt it the headrest, bolt it to the back of the seat? That part as the
support of the side plates...
www.lusitanamotorcompany.com
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Tilo
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| posted on 22/5/11 at 09:20 PM |
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The prop was cut, made a thick inner tube which got in about 7cm for each side joined both ends and left a 3mm gap between to have it filled with
weld. After, it was rectified. This will do for testing, I'll have one made for it if all goes well.
www.lusitanamotorcompany.com
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