907
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| posted on 26/6/15 at 08:22 AM |
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^^^^^
+1
I push my car out of the garage rather than fill it with fumes.
I have one hand Pulling on the roll bar while the other hand is pushing on the steering wheel. (Momo Race)
I often run over my foot though. 
Paul G
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jeffw
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| posted on 26/6/15 at 08:28 AM |
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quote:
Originally posted by 907
I often run over my foot though.
Paul G
made me smile....been there done that
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907
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| posted on 26/6/15 at 10:20 AM |
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quote:
Originally posted by jeffw
quote:
Originally posted by 907
I often run over my foot though.
Paul G
made me smile....been there done that
When I did the corner weights I made sure that wheel was the lightest. 
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RickRick
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| posted on 26/6/15 at 10:25 AM |
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If you have paddle shifts fitted like me each gear shift is pulling the paddle and the wheel together not a huge load but repeated many times
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Grimsdale
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| posted on 26/6/15 at 11:14 AM |
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quote:
Originally posted by russbost
I can honestly say we've been selling the RMD "D" shaped wheel for probably at least 5 years now - the above failure is the first
I've been told of that we have sold - until a broken wheel has been examined by a metallurgist (which I most certainly am not) you can only
speculate with regard to the actual CAUSE of the failure
I'm a metallurgist specialising in failure analysis, so if I can be of any help, let me know. I've had a very brief look at an intact rmd
steering wheel, and it was very soft (~40HV). I'd be amazed if the failure was anything other than fatigue due to insufficient strength.
Andy
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MikeRJ
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| posted on 26/6/15 at 11:39 AM |
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quote:
Originally posted by russbost
If anyone thinks I'm being daft here please point me in the right direction? I would say it would be impossible to fracture a spoke with a
torque applied around the centre even if you're a body builder & you jam the steering against the lock stops, however work it back &
forth in a forward/backward motion for long enough & a fracture is almost inevitable, irrelevant of the manufacturer of the wheel ................
How many other manufactures wheels ( e.g. Momo, Mountney etc) have been reported as having failed on here or on the RH forums? If a score has been
made in the metal where the suede covering is trimmed, a fatigue failure has pretty much been manufactured into the wheel.
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Davey D
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| posted on 26/6/15 at 01:56 PM |
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Here are some pics of the steering wheel showing where it has gone
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BangedupTiger
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| posted on 26/6/15 at 02:10 PM |
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Sam_68
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| posted on 26/6/15 at 02:12 PM |
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I'm NOT a metallurgist, so Grimsdale may tell me I'm talking absolute nonsense, but since it's fractured at a score-line for the
suede covering, is it possible that it's suffered a fatigue failure, starting from the stress raiser of the score line, because the mass of the
rim was vibrating at high frequency (possibly hitting a critical frequency)?
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Digimon
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| posted on 26/6/15 at 02:47 PM |
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Do you have any vernier calipers to measure thickness of the material?
I'd really like to know because I will be binning mine for a Momo replacement if the new wheels are also faulty
[Edited on 26/6/15 by Digimon]
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40inches
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| posted on 26/6/15 at 03:14 PM |
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Just checked mine. Purchased from Rally Design at Stoneleigh 2014 (Show Offer).
All three spokes are scored on both sides, but they are 5mm thick
Still not sure what to do .
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Davey D
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| posted on 26/6/15 at 03:28 PM |
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Just checked and mine is 4mm thick
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Digimon
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| posted on 26/6/15 at 03:33 PM |
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That maybe one of the old batch only being 4mm
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leon51274
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| posted on 26/6/15 at 03:38 PM |
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Just checked mine and its 4mm
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alex1991
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| posted on 26/6/15 at 04:00 PM |
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Just measured mine with vernier calipers and it's 5mm thick.
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BangedupTiger
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| posted on 26/6/15 at 04:37 PM |
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If it's going to snap at 4mm, it'll snap at 5mm. Thickness isn't the important factor. Just chuck the pieces of poo in the bin.
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