what shape dou you think is better

1 simple

single

or
2 double bend


double bevel

mechanically or aesthetically (dodgy spelling???)

mechanically not sure
second one looks better IMHO

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

You know my vote Tim - but i have given it anyway!

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.

Its all in the angle, vertical looks too out of place, but a slight angle inwards can make a big difference.

D

no 2 can be adjusted into something like this


double bevel2

Bugger - now i can't decide between umber wo and the new version.... grrrrrr

Are we assuming you're including but not showing a diagonal?

Mark

quote:

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Originally posted by dern
Are we assuming you're including but not showing a diagonal?

Mark

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quote:

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Originally posted by timf

quote:

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Originally posted by dern
Are we assuming you're including but not showing a diagonal?

Mark

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if required driver top to passenger bottom
also if required a bar for seat belt mounting points

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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

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.

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.

In case you miss understand my waffling, this is what I mean.
Rescued attachment Rollbar.JPG

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