spunky
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| posted on 15/7/04 at 08:31 AM |
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Rhetorical question.
What are the implications of a fixed rear axle handling wise.
Reason for asking is, there are a number of road registered quads around with fixed axle, I was wondering if it could be scaled up to a single seat
car. So apart from shredding your tyres what else happens.
John
The reckless man may not live as long......
But the cautious man does not live at all.....
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Steve Hnz
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| posted on 15/7/04 at 08:44 AM |
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Assuming you mean without a diff, you show a marked reluctance to go around corners . Sort of terminal understeer.
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Viper
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| posted on 15/7/04 at 08:44 AM |
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Bust the diff. snap the halfshafts, wont go round corners unless you lift the inside wheel or get it sliding.....
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spunky
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| posted on 15/7/04 at 09:03 AM |
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quote:
Originally posted by Viper
Bust the diff. snap the halfshafts, wont go round corners unless you lift the inside wheel or get it sliding.....
Sliding...
yep thats how the quads take the corners.
Wasn't sure if they were playing or if it was neccessary
The reckless man may not live as long......
But the cautious man does not live at all.....
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Viper
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| posted on 15/7/04 at 09:21 AM |
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A kart uses a live axle,and because we have loads of grip we have to lift the inside wheel slightley to go round any sort of corner...
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paulf
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| posted on 15/7/04 at 12:08 PM |
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How about using a solid axle, cut in half and joined by some sort of slipping friction clutch as is used on some industrial machinery?
.Paul.
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ned
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| posted on 15/7/04 at 12:12 PM |
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sounds like you're referring to a viscous lsd!
Ned.
beware, I've got yellow skin
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paulf
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| posted on 15/7/04 at 12:19 PM |
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I was thinking of something along the lines of a springloaded clutch running in oil.Maybe something could be made up using bike clutch plates in a
machined housing, not sure how it would be set up or how long it would last.
Paul
quote:
Originally posted by ned
sounds like you're referring to a viscous lsd!
Ned.
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Cita
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| posted on 15/7/04 at 04:57 PM |
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Formula 500 (former formula 440) use solid axles without a diff and they seem to corner pretty good.They use rubber suspension to make the picture
complete.
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Spyderman
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| posted on 15/7/04 at 10:56 PM |
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Another way around it would be to use a ratchet type device! Much like a bicycle rear wheel hub.
It can freewheel in one direction, but not the other.
It would need both wheels with freewheeling hubs tho'. And would make reversing impossible!
Spyderman
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crbrlfrost
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| posted on 15/7/04 at 11:47 PM |
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If going through the trouble of a clutch in oil or a ratcheting center, than why bother with a solid axle anyway. The most typical way to make one
corner is to raise the inside rear with usually requires more extreme castor in order to jack the chassis diagonally. Or set it up like a front driver
(as they like to transfer all weight to the outside rear as well) by using very stiff rear roll bars and left foot braking. But all this seems like a
lot of trouble for saving a few pounds on the diff or "reducing" complexity. Cheers!
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Browser
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| posted on 16/7/04 at 09:35 AM |
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Porsche have used a 'Spool' differential in more than one of their racing cars, including one of the 911 RSR derivatives, I think some of
the 956s and the mighty 917/30 Can Am car. I believe they did this as the rather all or nothing nature of the power delivery of their engines, the
idiotic amounts of power derived from the aforementioned engines and the less sophisticated traction control systems available then (the drivers
reactions) meant that getting the power down was difficult, so they ran a solid axle and balanced the resultant poorer cornering with faster
straight-line acceleration than the competition. Must've been interesting driving the 917/30, 1100bhp and a solid axle
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spunky
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| posted on 16/7/04 at 10:25 AM |
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Interesting replies, glad I asked.
Think I'll give it a go.
Planning on building a single seater with a more off road bias, long travel soft suspenders, full cage etc. Will be closely related to the Edge
Pirahna. If all goes to plan, powered by Honda V4.
However I'm gonna try and get it through SVA .
Have made a model of a chassis to incorporate diff and IRS but adds a lot of weight which defeats the object, since the idea is a very lightweight
buggy type of thing for real Locost
As they say...
Faint hearted never f****d a pig.
John
The reckless man may not live as long......
But the cautious man does not live at all.....
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crbrlfrost
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| posted on 17/7/04 at 01:08 AM |
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The 917 went to a spool after trying several diffs, as the huge amount of power had very adverse effects on they're normal operation and it
actually made it more stable. Don't know about the others. One other thought, its amusing that everyone uses the term "mighty"
before "917." Wonder if you get deported from Sturrtgart for saying it wrong! Cheers!
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