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22 Feb 2005, 03:29 (Ref:1231996)
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Racer
Join Date: Dec 2002
Posts: 338
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human powered vehicle design
Well it is time to build another HPV for my school to compete in couple of 24hr races and I have to decide between CrMo or aluminium.
The current HPV is 4130 CrMo but I was considering using aluminium. I feel that aluminium alloy would be acceptable but are unsure of the correct grade and heat treatment to use. Strength and fatigue are of a major concern due to the pounding these vehicles can take over 24hrs. If anyone has any suggestions about either material it would be appreciated. Last edited by coln72; 22 Feb 2005 at 03:31. |
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__________________
Think drifting is tough. Try it on gravel, in the dark, amonst trees............... 
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22 Feb 2005, 07:45 (Ref:1232077)
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#2 | ||
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Veteran
Join Date: Sep 2003
Posts: 1,767
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6061T6? Easy enough to weld and readily available. Or 2024T3 if you can find it. You can get both in either sheet or tube as well.
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__________________
"...full of sound and fury, yet signifying nothing...."
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22 Feb 2005, 19:22 (Ref:1232696)
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#3 | ||
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Veteran
Join Date: Nov 2001
Posts: 601
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Remember though that when you weld Aluminium the properties radically change. The UTS of a welded joint drops so low that in order to compensate, it is lighter to use T45 steel ~ hence the reason that Lotus used rovers bonded chassis idea
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__________________
I love the deadlines. Especially the sound of them screaming by...
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22 Feb 2005, 23:39 (Ref:1232961)
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#4 | |
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Rookie
Join Date: Oct 2004
Posts: 23
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It's not really answering your question but the www.pedalcars.info website is quite useful for all things HPV/Pedal cars.
And there's lots of teams/people with first hand experience from UK 24 hour races (French and Hong Kong 24h are planned to be competed in soon - money permitting) |
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23 Feb 2005, 04:43 (Ref:1233079)
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#5 | ||
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Racer
Join Date: Dec 2002
Posts: 338
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Thanks for the link but our rules are slightly different
eg. we are allowed three wheelers and up to 8 riders in a team. The link to the local event is http://racvenergybreakthrough.net if you are interested. It is a school only event but there are others that allow any team to compete. Cant attatch a pic to show people last years design and to ask for improvements. Stupid bloody computer........ 
Last edited by coln72; 23 Feb 2005 at 04:49. |
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__________________
Think drifting is tough. Try it on gravel, in the dark, amonst trees...............
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