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| MementoMori |
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MementoMori
World Chat Champion
Joined: 22 Aug 2004
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 Posted: 00:08 - 30 Aug 2004  Post subject: I don't know what it is but it doesn't sound good. |
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I just watched a video of someone on the Isle of Man TT coming around a corner, with the bike then starting to jerk from left to right, which gradually got worse untill he fell off the side. This is supposed to be a tankslapper?
I didn't see him slap his tank.... purposefully, or accidentally... I don't understand!....
Talking about tanks, are tank protectors a good idea? My tank's some kind of plastic on the outside...  So, not sure if I should.. invest in one.
Thanks 
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| Kickstart |
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Kickstart
The Oracle
Joined: 04 Feb 2002
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| MementoMori |
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MementoMori
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Joined: 22 Aug 2004
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| Posted: 09:40 - 30 Aug 2004 Post subject: |
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Oh, I understand now. Thankyou.
Why does it do that? Can't randomly happen at any time can it? 
Thanks
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| Bendy |
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Bendy
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Joined: 10 Jun 2002
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| TheShaggyDA |
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TheShaggyDA
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Joined: 14 Jun 2004
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| Posted: 09:55 - 30 Aug 2004 Post subject: |
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If this is the video you mean, it is indeed a tank slapper :-
https://www.geocities.com/motorcycle_mania/pics/tankslap2.mpg
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Current: CB500 Previous: CB100N, CB250RS, XJ900F, GT550, GPZ750R/1000RX, AJS M16, R100RT, Enfield Bullet
[i:6e3bfc7581]But still I fear and still I dare not laugh at the madman...[/i:6e3bfc7581] |
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| Kickstart |
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Kickstart
The Oracle
Joined: 04 Feb 2002
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| Posted: 11:54 - 30 Aug 2004 Post subject: |
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| MementoMori wrote: | Why does it do that? Can't randomly happen at any time can it? |
All things have a natural resonant frequency, and on a bike that is likely to mainly affect the tyres, forks, frame, etc. When all of these happen to resonate at the same time the effects can become cumulative (find a video of the Tachoma Narrows Bridge to see a good example of the effect), and thus very violent. So violent that they can throw you off the bike or dislocate your shoulder should you try and hang on. Lots of things can affect it, such as extra weight on the yokes (eg, fitting a handlebar fairing), holding on to the bars too tightly to hold yourself in position at speed, worn tyres, blown suspension seals, etc.
True tank slappers basically do not happen on modern bikes unless something is wrong (they might get a bit nervous and shake the bars a bit, but not really anything like a tank slapper), but go back 20 years and they would be quite easy to provoke on, say, an RD350LC.
All the best
Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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| Simpy2k |
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Simpy2k
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Joined: 17 Jun 2004
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| Rory |
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Rory
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| Kickstart |
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Kickstart
The Oracle
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| Retro-Man |
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Retro-Man
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| Posted: 18:44 - 30 Aug 2004 Post subject: |
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"paracetamol to cure a brain tumor"
I like it
Tank Slapper = head bearing fault in my book
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| Kickstart |
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Kickstart
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Posted: 20:25 - 30 Aug 2004  Post subject: |
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Hi
I had a problem with the Divvy shaking. Took ages to fix the problem. New steering head bearings (notchy), rebuilt shock (it went pop), fresh fork oil, top box on and off. Finally went to change the tyres and found a tiny bit of play in the front wheel bearings, and with the tyres and front wheel bearings replaced the shake disappeared.
All the best
Keith
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| Wave2k |
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Wave2k
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Joined: 06 Apr 2004
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Old Thread Alert!
The last post was made 21 years, 187 days ago. Instead of replying here, would creating a new thread be more useful? |
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