gazza285
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| posted on 5/7/05 at 09:22 AM |
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quote:
Originally posted by RallyHarry
How expensive is titanium ?,
"How to build a sports car for £25,000"
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rocket
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| posted on 5/7/05 at 09:25 AM |
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JAD
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| posted on 5/7/05 at 03:07 PM |
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Porsche used aluminum tubing for their 917 types; however, due to cracking of the welds (or heat affected zone) they had to pressurize the tubing with
gas. All tubing intersections has drilled holes so that a common path was created for the pressurized gas. A pressure gage was welded into the frame
and when the pressure dropped, back to the factory with the frame to repair the cracks.
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silex
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 posted on 5/7/05 at 03:59 PM |
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Well you could always opt for little machined corner joints that the tubes would slide into - bonded in place of course so as to eliminate weld
stress.
It would look like a Knex kit, but foe big boys
Murphy's 2 laws
1. If it can go wrong it will
2. In case of emergency - refer to rule 1.
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crbrlfrost
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| posted on 5/7/05 at 04:32 PM |
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Aluminium can have a descent fatigue life, if the alloy is carefully choosen and the loads limited to the lower slope of the fatigue curve, kind of
like a 1/x graph. Anyway, the whole point of using a lighter and lower IE materials is so it can be better utilized by increasing distance between
loaded surfaces, increasing the moment arm in the materials favor. So it wouldn't really make sense to weld together small AL tubes when the
materials could be put to better use with larger thinwall sections, hence the use of big AL extrusions by the manufacturers. Titanium has the same
issues aluminium does in regards to weight/stiffness, but it has better high temperature properties and is a pain to fabricate, not to mention price
(molten Ti eats through investment tooling and casting equipment, drives up manufacturing costs, oh, and has to be done under vacuum). Anyway, to make
a short story long, I'd have to say either go steel spaceframe, aluminium monocoque, or s happy mixture of the two. Cheers!
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mark chandler
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| posted on 5/7/05 at 11:07 PM |
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Chaps,
Thanks for the many posts, my mind is now made up, I will follow the recommendations as per kitcaranalysis.doc in 18swg steel.
First task is build a table and carefully mark out as per the book and chassis corrections.... its all getting confusing but the setting out should
clarify things. I,ve sourced my cortina hubs now, just got to collect the IRS and worry about reverse and engine position.
Cheers Mark
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rocket
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| posted on 6/7/05 at 08:07 AM |
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titanium
Popular miss conception about titanium being welded in a vacuum!!
It doesn't !
Rgds
Roger
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NS Dev
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| posted on 6/7/05 at 12:13 PM |
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Rocket, you missed the point a bit I think!
He was saying it has to be CAST under vacuum, which is entirely true unless you want a casting with the properties of a sponge.
It has to be welded in a pure inert gas atmosphere though (the setups I have seen use old baby incubators filled with argon) which is still hardly
convenient!!
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RallyHarry
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| posted on 7/7/05 at 06:06 AM |
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It'll really be a small car then if it'll fit in a baby incubator, small car would mean small cost though.
Cheers
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rocket
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| posted on 7/7/05 at 08:14 AM |
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titanium
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smart51
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| posted on 7/7/05 at 11:25 AM |
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Titanium is a fantastic engineering material but diamond is better. A diamond cored carbon fibre laminate with titanium fixing brackets would make
the best chassis with magnesium-polypropylene body panels.
For a locost that is built in your own home, midl steel, aluminium sheet and GRP are your best friends.
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rocket
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| posted on 8/7/05 at 08:59 AM |
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frame
diamond would be too heavy!!
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NS Dev
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| posted on 8/7/05 at 09:19 AM |
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what's wrong with good ol' wood?
I thought my oak framed special with contiboard cladding looked quite smart!
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smart51
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| posted on 8/7/05 at 09:23 AM |
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diamond is light - it's made of carbon. It's lighter than aluminium, just.
I was thinking of using depleted uranium with a riven granite dash but that would be quite heavy. Those of you using pinto engines might want to
consider it as it will hardly affect the car's overall weight
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smart51
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| posted on 8/7/05 at 09:26 AM |
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WOOD
A wooden car. Fantastic. You could have a Diamuid Gavin inspired one made out of used railway sleepers! A bit of teak oil and it would look
beautiful. It might even float.
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NS Dev
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| posted on 8/7/05 at 11:10 AM |
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I think I've seen the future!!!
Wouldn't even need too much cuprinol if you used railway sleepers. Telegraph poles aren't bad either!!
Thought about using cardboard cladding for the bodywork too.
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MikeR
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| posted on 8/7/05 at 11:11 AM |
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So thats how the Gibbs Aquida works ...... now i know where all the railway sleepers have gone in Nuneaton !!!!!!!
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geoffreyh
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| posted on 28/12/05 at 11:14 PM |
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If you are looking for someone who did it already try the following link
http://www.geocities.com/MotorCity/7630/
Cheers,
Geoff
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rocket
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| posted on 29/12/05 at 05:51 PM |
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ally
It's not worth it all that trouble and expense for a 620kg car!!!!!!
My chassis is st/st and I won't be going past 550kg with a sierra base and zetec engine!!!
Probly be cracked in a year or so ( like mine)
Rgds
Roger
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geoffreyh
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| posted on 29/12/05 at 05:56 PM |
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Maybe Aluminium tubing is not the best solution but by plating the chassis you get a very stiff chassis. A stiff chassis can eventually cope with more
engine forces.
I think the building idea is not so bad.
Cheers,
Geoff
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