Humbug
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| posted on 29/10/06 at 10:59 PM |
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Cycle wing stays part 273b
One of my wing stays broke again today - I think that's about 5 times between the two now.
They are ST items of the traditional type for Cortina hubs, i.e. a triangular plate with 3 holes to bolt to the brake dust cover holes, tubular arms
and flat bar to go round the under the wing. First to go was the join between the flat and the tube on one side. I got that welded up with a second
3mm flat welded onto it (and had all the others done). Since then, one or other join between the hollow tube and the mounting plate has broken.
Just wondered if a different design might help, using thicker flat bar from the plate all the way round, rather than having a an extra join.
Any thoughts, e.g.
would it be too flexible?
would the flat steel bar available in lengths from Homebase etc. be OK?
since I can't weld, would bolting the contraption together be OK?
Thanks in advance
 
Rescued attachment Cycle wing stay design.jpg
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jonbeedle
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| posted on 29/10/06 at 11:10 PM |
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I made mine from 3mm flat stock, which is a bit on the thin side really as they wobble a bit. But if you made them or had them made from 6mm flat,
they should last and they won't wobble. When they are made from tube the break always occurs at the join between the tube and the flat bit as
this is the weakest point.
I must say even though everyone makes fun of my wobbly wing stays, they haven't broken once in 2600 miles
Cheers
Jon
"Everyone is entitled to an opinion however stupid!"
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JAG
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| posted on 30/10/06 at 09:14 AM |
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My ST wing stays have broken but only where the round tube is welded to the triangular centre.
I put a length of solid rod (a 6" long bolt with the head cut off) inside where the tube had broken and welded them back up. They're solid
and so far, touch wood, they've not broken again.
It is a crap design. However bolted stays are no better. MNR bolt thiers and a friends shaked so badly MNR welded them for him 
The two joints were the tubes meet the flat areas need better designing. The joints are stress raisers.
I think using tube all the way under the wings would be best. You could crush it and it would be flat but with a smoother transition from round to
flat - that would alleviate the stresses at the wing end.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Humbug
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| posted on 30/10/06 at 10:41 AM |
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In effect I have done the same as you - jammed threaded rod up the inside of the tube and fixed with Araldite Steel... the ones I have done that to
are OK. I think there is one more to go 
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d8mok
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| posted on 30/10/06 at 12:39 PM |
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i had this with mine so i got andy from ab performance to make me some custom ones. They shud be here 2moro so i'll let ya know if there any
good.
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Humbug
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| posted on 30/10/06 at 01:30 PM |
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quote:
Originally posted by d8mok
i had this with mine so i got andy from ab performance to make me some custom ones. They shud be here 2moro so i'll let ya know if there any
good.
Yes, please do.
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