flak monkey
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| posted on 29/7/07 at 06:52 PM |
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How have you stopped your front wing stays breaking?
I have managed to break both front wing stays on the GTS now. Both failed in the same place, at the weld joining the bent bar to the tubular frame
(see pic).
Tomorrow I am going to attempt to solve the problem for good, but would like to see some of your solutions 
I was thinking of welding a gusset either side of the bent bar which takes the bending loads off the weld. What do you think?
 
David
Sera
http://www.motosera.com
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tom_loughlin
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| posted on 29/7/07 at 06:59 PM |
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Hi Mate,
Congrats on getting your car done and dusted....sounds like you're starting to reap the joys of ownership already!
I welded a 5mm bar, instead of the 2.5mm that is there...only onto the forward most stay on each bracket.
Has lasted more than 1k miles. (touch wood it doesn't snap now)
Just got back from a weekend camping in the blue machine...dissappeared to anglesey - the first longish blast I have had for a long time!
If you're free next weekend, fancy organising some sort of road trip?
Tom
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NeilP
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| posted on 29/7/07 at 07:01 PM |
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David,
The Luego stay is 5mm and is pressed into the tubular section to give some more support - Was a sod to bend over the wheel but shows no sighs of any
fatigue (even after yesterday's fun and games).
Neil.
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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David Jenkins
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| posted on 29/7/07 at 07:02 PM |
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Welcome to the joys of cycle wings! 
Previous discussions
I believe that a radical redesign is required - the one from locoR1 makes the most engineering sense, but not easy to implement (I'm still
thinking about that one).
Clam shell wings are looking more and more attractive - I rarely drive fast enough to worry about aerodynamic lift!
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SeaBass
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| posted on 29/7/07 at 07:11 PM |
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One of the main issues seems to be the material spec that people are using. After on of mine flew off I use some 25x5 bright drawn bar. Seems to have
done the trick for a couple of years.
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David Jenkins
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| posted on 29/7/07 at 07:18 PM |
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Bright drawn bar is tougher than black mild steel - but much harder to bend into shape. It can crack on bending, if care isn't taken (been
there, done that). You usually have to heat to at least red-hot to avoid cracks, but then you may lose the inherent toughness produced when the steel
was rolled.
I still think the real solution is to stop the mudguard flapping in the first place - not easy, when the mounting points are on one side only!
[Edited on 29/7/07 by David Jenkins]
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indykid
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| posted on 29/7/07 at 07:35 PM |
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i welded gussets across the back of the joins on my MK brackets. they just weren't up to supporting relatively heavy dax cycle wings without it.
they were fine after that.
tom
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eagle
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| posted on 29/7/07 at 07:42 PM |
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I had the same problem
I used 5mm bar as all ready suggested
still ok after 4000 miles
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Wadders
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| posted on 29/7/07 at 07:45 PM |
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I'm not a fan of flat bar for cycle wings, unless you use really heavy stuff its bound
to fracture eventually.
Iv'e found brazing rather than welding is much better for longevity.
See pics below for my latest take on cycle wing brackets, made from 14mm x 1.2mm tube and fully brazed. My last brazed pair never let me down, sadly i
killed one at Anglesey hence the new ones.
Al.
 
Description
 
Description
[img][/img]
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Wadders
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| posted on 29/7/07 at 07:57 PM |
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Deffo Not planning on a repeat performance! too expensive.
Hard to tell on here, but both front wheels are actually off the ground, must have been going faster than i thought.
Sorry for the hijack david
Originally posted by chris mason
thats a great picture that one Al, lets hope you don't do the same when we go back 
Chris
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JoelP
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| posted on 29/7/07 at 08:45 PM |
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great picture, looks like the wing mirror nearly twatted you!
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davie h
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| posted on 29/7/07 at 09:13 PM |
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thats one of the best pics i have ever seen. the cone, mirror and wing flying through the air
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Humbug
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| posted on 29/7/07 at 09:15 PM |
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As above - look at the previous threads. My solution was no welds and used 2x flat bar (about 30mm x 5mm) bolted through the original triangular base
plate.
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paulf
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| posted on 29/7/07 at 09:18 PM |
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I doubled up the flat bar between the tube top and wing by adding another bit of the same material 25x3mm and tapering the edge towards the wing so as
to make an inverted U shape . I fully welded the edges and then heated all the welded joints on the stays to a medium red heat and let them cool
naturally.
i have had the car on the road for 3 years now and no problems so far although the wings do flex a fair bit.
Paul.
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nitram38
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| posted on 30/7/07 at 03:50 AM |
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Wadders, how is the stay connected to the wing?
Is there another frame inside the wing?
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Hellfire
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| posted on 30/7/07 at 04:38 PM |
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Al, did you get the whole sequence of pics?
With regard to wing brackets, our original MK brackets have now covered more than 10,000 miles, been thrown around a lamp-post in a front end
collision and are still going strong
They'll now probably drop off tomorrow having said that..............
Phil
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neilj37
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| posted on 30/7/07 at 04:52 PM |
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Try giving Chris or Marc at ring at MNR as there stays are fully tubular (not flat bar) and look more than good enough for the job.
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Wadders
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| posted on 30/7/07 at 06:18 PM |
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Nitram38,
yes iv'e bonded flat bar underneath the
cycle wings which pick up on the stays with bolts.
Phil,
i've started a new thread in Clubs and events, so not to hijack this one any more than i have already. A full sequence in technicolour
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nitram38
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| posted on 30/7/07 at 06:25 PM |
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quote:
Originally posted by Wadders
Nitram38,
yes iv'e bonded flat bar underneath the
cycle wings which pick up on the stays with bolts.
I really like them!
I will probably do that to my carbon mod csr wings!
[Edited on 30/7/2007 by nitram38]
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ned
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| posted on 31/7/07 at 09:59 AM |
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http://www.locostbuilders.co.uk/viewthread.php?tid=63669
told you so 
beware, I've got yellow skin
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David Jenkins
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| posted on 31/7/07 at 08:36 PM |
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Out of interest, can carbon fibre be made in such a way that it doesn't suffer from fatigue fracture? If nothing else, it could be moulded
thicker in all the appropriate places.
It would be quite cool to have c/f mudguard stays...
(but damn expensive, I'm sure! )
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Wadders
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| posted on 31/7/07 at 09:35 PM |
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Now there's a thought david, wonder if it would be possible to use the carbon fibre rod from a golf club or fishing pole etc with ally brackets
bonded into the ends? slighly lower cost version of full cf.
Al.
Originally posted by David Jenkins
Out of interest, can carbon fibre be made in such a way that it doesn't suffer from fatigue fracture? If nothing else, it could be moulded
thicker in all the appropriate places.
It would be quite cool to have c/f mudguard stays...
(but damn expensive, I'm sure! )
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ned
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| posted on 1/8/07 at 06:31 AM |
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I'm using the mnr wing stays and i'd be extremely suprised if one of those has ever failed from fatigue.
Ned.
beware, I've got yellow skin
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flak monkey
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| posted on 3/8/07 at 05:24 PM |
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I have had an idea, inspired by something matt.c said when we were out the other night.
Another stay to the back edge of the wing would fully constrain it and stop it flapping. A bit of tube welded to the rear tubular part of the stay,
with another bent bit of strip bolted to the wing should solve the problem I think. Time will tell.
I am currently making the bits to do it, and should have it sorted next week. I will tack it together and see if it stops the flapping. I could also
do with another bit of bracing under the bend on the inside of the wing.
The current stiffening has got this far, and has made a huge difference already
 
Rescued attachment Wing stiffening 1.jpg
Sera
http://www.motosera.com
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paulf
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| posted on 3/8/07 at 08:54 PM |
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Looking at that picture i would say that the flat strip is far to long, it would be better to get the tube closer to the wing to reduce the length of
it.
Paul.
quote:
Originally posted by flak monkey
The current stiffening has got this far, and has made a huge difference already
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.jpg)
