jlparsons
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| posted on 24/1/07 at 09:29 PM |
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Non-ladder frame cobra?
Purely an idle speculation, this one - anyone seen a cobra kit that's not based on a ladder frame? Seems there's a lot of space that you
could maybe make more use of to make a lighter or stiffer chassis. Maybe a spaceframe or one that uses the body sections as stressed members?
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
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timmy
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| posted on 24/1/07 at 09:34 PM |
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But the body is fibreglass isn't it??
I don't think you can't stress that unless your name is Colin Chapman.....
And spaceframes become problematic when you start introducing doors. One of the reasons (apparently) why the gullwing SLR merc of old had such weird
doors.
I would investigate a backbone chassis a-la Lotus Elan/Europa for something like a Cobra.
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jlparsons
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| posted on 24/1/07 at 09:40 PM |
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i know some kits use aly bodies, and i've seen some other replicas that used stressed grp. I'm guessing that required a lot of investment
and prototyping.
I'm with you on the doors issue, but could you use more of a 3d structure fore and aft to attach to the backbone/sill girders?
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
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ed_crouch
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| posted on 24/1/07 at 09:47 PM |
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TVRs use a backbone chassis design to great effect. Note that most competition TVRs (including the race Tuscans) have big, labyrinth-like rollcages:
its more about stiffenss (handling) than safety!
Ed.
You always lose stiffness by not having a steel roof over you.
Ed.
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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rsk289locost
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| posted on 24/1/07 at 09:51 PM |
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Gardner Douglas use a TVR/Lotus style backbone with a stressed body. http://www.gdcars.com/images/gallery/gd427/DSC00009_JPG_gd427.jpg
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Catpuss
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| posted on 24/1/07 at 10:59 PM |
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The pilgrim one from "A car is born" uses a galvanised welded tub and the Sierra "swinging arms" as rear suspension.
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jlparsons
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| posted on 24/1/07 at 10:59 PM |
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quote:
Originally posted by ed_crouch
TVRs use a backbone chassis design to great effect. Note that most competition TVRs (including the race Tuscans) have big, labyrinth-like rollcages:
its more about stiffenss (handling) than safety!
Ed.
You always lose stiffness by not having a steel roof over you.
Ed.
That rollcage idea is what I'm pondering for my locost - integral rollcage, slanted A-pillars joined to the chassis rails thorugh the scuttle
with an hourglass shaped backbone joined to the rear rollbar. Should be a lot stiffer and safer for road use, is the plan. Been done a few times and
looks pretty good I think.
That Garner Douglas looks good, think I've seen that one before. Instrinct would nag me to sit in the chassis rather than in a GRP structure
mounted to it though. Might be a touch fragile in a side-swipe?
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
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