WSB Ducati looses it's wheel

[rac3r]

https://www.youtube.com/watch?v=AnJdEFigY2I&feature=related


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[The Artist]

Jeebus.

How would that even happen? I mean what could cause that on a wsb bike? Chain failure some how ripping the wheels from the bike?

[Bendy]

It looks like a spoke failure, when you see it bouncing past the camera later it's got no middle at all.

[Howling TerrorOutOfOffice]

Someone at Marchesini is gonna get in trouble.
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[The Artist]

[dogbot]

Apparently, the centre of the wheel "disintegrated" under torque, they were saying on the later commentary.

[Howling TerrorOutOfOffice]

[rac3r]

[Ed Case]

Bit of a 'clenching' moment there for Berger

[Stevie GooGs]

Just waiting for the Ducati making mechanics out of bikers since.
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[dogbot]

^^

https://gpone.com/images/ARCHIVIO/2011/foto/SUPERBIKE/02_Donington/cerchio.jpg

https://gpone.com/index.php/en/news/35-in-evidenza/3265-cerchio-rotto-berger-come-spencer.html

[Frost]

Could have been worse, could have been at the TT:

https://www.youtube.com/watch?v=B6T6dTIOZ2c

[The Artist]

[Stevie GooGs]

Had to be done. Well i know its not exactly Ducati's fault.
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[mattb_uk]

I was working in one of the recovery van at Donington at the weekend and one of the bikes we got our hands on up was this very bike We had it in the back along side Sykes' ZX10

Still no clues as to why it happened but one thing could be that he actually had a faily big off the day before at Craner i think, it may well of been the same wheel that had been stressed in the crash the day before? You'd think that teams would automatically discard potentially damaged items but mistakes happen, either way its just a guess so we will just have to speculate.

[27cows]

That's what happens when you try to get the weight down just that little bit too much
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[Aikman666]

Looks like its down to absolute piss poor design to be honest.
My guess is that the torsion force of the single sider and the action of the torque has been far too much for those spokes to take. While either of these forces alone (usually designed to a threshold a few times the power output of the bike) would have been fine - the simultaneous application of both torsion forces and normal moment of force puts considerable more amounts of strain on the spokes in each plane making it overall weaker.

Science in action.
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[Wozza]

Where is there torsion in the spokes?

I think it is simply a fatigue failure.

[Aikman666]

[Wozza]

I can see how the chain must create a small bending moment in the axle, but surely only the rotational moment can be transferred to the wheel. I'm not sure I fully understand your explanation (what is the downwards force?) but it sounds like you're describing the bending moment in the axle. Feel free to get technical - 3rd year civil engineer so I ought to be able to follow.

Manufacturing error I'd go with, some kind of error with the material or manufacturing process, leading to premature fatigue. If the wheel had been deformed slightly in the previous crash(es?) then Berger surely would have felt it as vibration - unless perhaps the wheel had not been deformed but cracks had developed; I'm not sure how brittle magnesium(?) is. I'd hesitate to say poor design at this level of engineering.