timf
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| posted on 3/3/05 at 12:05 PM |
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roll bar shape
what shape dou you think is better
1 simple
 
single
or
2 double bend
 
double bevel
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liam.mccaffrey
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| posted on 3/3/05 at 12:17 PM |
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mechanically or aesthetically (dodgy spelling???)
mechanically not sure
second one looks better IMHO
Build Blog
Build Photo Album
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nick205
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| posted on 3/3/05 at 12:33 PM |
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Personally I prefer the shape of the MK Indy roll bar, which looks like the top half of your second option - i.e without the vertical sections.
Mechanically I have no idea which is better though.
I also like the Dax Rush shape as well, but I'm not sure it would be appreciated by any potential passengers
HTH
Nick
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DaveFJ
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| posted on 3/3/05 at 12:37 PM |
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You know my vote Tim - but i have given it anyway!
Dave
"In Support of Help the Heroes" - Always
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chrism
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| posted on 3/3/05 at 12:54 PM |
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I prefer the Dax style one and have made one ready for my Locost.
Only took two attempts, the first one came out too wide.
But the if the choice is between the two then the second one.
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irvined
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| posted on 3/3/05 at 01:28 PM |
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Its all in the angle, vertical looks too out of place, but a slight angle inwards can make a big difference.
D
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timf
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| posted on 3/3/05 at 01:42 PM |
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no 2 can be adjusted into something like this
 
double bevel2
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DaveFJ
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| posted on 3/3/05 at 02:31 PM |
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Bugger - now i can't decide between umber wo and the new version.... grrrrrr
Dave
"In Support of Help the Heroes" - Always
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dern
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| posted on 3/3/05 at 02:57 PM |
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Are we assuming you're including but not showing a diagonal?
Mark
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timf
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| posted on 3/3/05 at 04:08 PM |
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quote:
Originally posted by dern
Are we assuming you're including but not showing a diagonal?
Mark
if required driver top to passenger bottom
also if required a bar for seat belt mounting points
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dern
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| posted on 3/3/05 at 04:34 PM |
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quote:
Originally posted by timf
quote:
Originally posted by dern
Are we assuming you're including but not showing a diagonal?
Mark
if required driver top to passenger bottom
also if required a bar for seat belt mounting points
I meant a diagonal across the shapes you've drawn.
Edited to add: The reason I ask is that if you're not going to have a diagonal then it won't be that much use as a roll bar and I'd
go for the second one because it looks nicer and if it does and therefore is intended as a proper roll bar then I'd go for the former as it
offers slightly more protection.
Regards,
Mark
[Edited on 3/3/05 by dern]
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tom_loughlin
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| posted on 3/3/05 at 05:10 PM |
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just to throw a spanner in your works, as nick says, i love the dax style hoop - see my archive if your interested.
why are things never as simple as you first thought?!
tom
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zilspeed
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| posted on 3/3/05 at 06:24 PM |
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I would go for a narrowed single bend hoop. The one with the kink in the middle might look better, but forces will go down the hoop in a straight
line.
By having the bend in the middle like your second pic, you are giving deformation a head start in the event of actually needing your roll hoop.
It might be a slight weakness, but it is still there.
I vote tapered sides with no kink.
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clbarclay
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| posted on 3/3/05 at 06:49 PM |
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the seocnd example of design 2, but with no vertical bits at all. Have the tube attached to the chassis at an angle, so the whole bar only has 2
bends.
structurly it should then be about par with design 1, but with the advantage of having a large (all be it not much) contact area to the chassis so
there is more weld holding the roll bar on.
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clbarclay
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| posted on 3/3/05 at 06:53 PM |
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In case you miss understand my waffling, this is what I mean.
 
Rescued attachment Rollbar.JPG
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Fred W B
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| posted on 4/3/05 at 08:58 AM |
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That last shape is what I'm doing. I think it looks better then number one, and is techically better than the initial number two, as stated
above
Cheers
Fred WB
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