started to post this elsewhere but decided not to steal someone elses thread......

I've been toying with an idea but can't decide if it will look 'different and good' or 'odd and crap'....

basicallyi want a roll bar which has rear stays but don't want to go through the edges of the 'boot' so I was thinking......

How about if the rear stays dropped down the outside of the rear of the body and then wrapped round at the bottom to attach underneath the mounting plates... with the lot chromed....

so basically the rear stays would have a bend level with the edge of the body and then go straight down the outside...

clear as mud?

opinions? or or

Obviously any structural member is better if the force is transmitted in a straight line through the memer.

I have seen some cages though (landrover) with bends as you describe. If you though come down the sides of your back panel and then bolt from underneath in the event of a roll over all of your mounts which I presume will be bolted are going to be in shear and tension. With normal rear stays they are mainly in compression with a small amount of shear due to the angles.

Hope this helps.

Steve

I presume it would look like some of the external cages on off roaders.

Steve

I realise that it would be a compromise on strength but it wouls surely be a lot better than a completely unbraced roll bar?

I was thinking of using some pretty stong tube for the whols assembly so that has to help?


what i had in mind would indeed look a little like the roll cages you see on these big pickups that are so popular all of a sudden...

I did think that an added advanatage would that the down posts would act a little like a rear bumper....

I think it should look good and of course different.

here is a very quick scribble of my idea.....


Image deleted by owner

SO.. opinions? (the low crossbar is for attaching my seatbelts to)

I in principle looks ok, but i would suspect that in some cases of loading the brace bar would buckle unless it was tied in where the bend is.

Sorry

quote:

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Originally posted by DaveFJ
here is a very quick scribble of my idea.....


SO.. opinions? (the low crossbar is for attaching my seatbelts to)

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I quite like that - a bit different from the norm and individual. I can't help thinking that the long vertical members might suffer with vibration and they either need bracing across to each other or as nib1980 said, tied into the chassis at the bend.

You might also want to consider a diagonal to stop 'lozengeing' in the event of a roll. it will not be too strong in a sideways direction as you have it there.

Cheers

Mark

The only problem i see is keeping it tight to the bodywork, the bend radius required may be a bit large where it tucks back under the rear.

to make my idea a lttle clearer here is a very rough sketch of the top down view:


[img][/img]

Instead of having the lower points "return", why don't you have them mounted on a plate that sticks out at that location, you could have them either welded or bolted then.
You would have to obviously ensure the plate was rounded off etc, but if you mounted it in the same manner as the top mounts it would look quite cool and "tied-in" I think. only imo of course

cheers,
Steve.

[Edited on 28/2/07 by worX]

to extend the idea a little....

how about a bumper made of the same tube with the down tubes attached to it?


[img][/img]

hello mate , i don't know about stresses and such . i think firstly it looks quite smart and secondly would add some protection for both your bodywork and petrol tank if you get a tap from behind . cheers scott