Monoshock John Player??

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Anyone have more photos, details, info of this frame (without the fairing)?

181033312_10159450371259306_146784764959896199_n.jpg
 
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Groupe JPS Facebook. ;)

Basil Knight a répondu au commentaire de Gareth Smith: Gareth Smith , ouais, j’ai tout dessiné, et j’ai traité avec Koni sur l’unité d’impact arrière. Étrangement, j’avais totalement oublié toute la moto jusqu’à ce que je l’ai vu dans le livre willys. C’était basé sur ce que le Cosworth allait être. Je regarde en arrière et souhaite que PJ n’avait jamais eu son accident ....... les choses auraient été si différentes de ce qui s’est passé par la suite.
 

Time Warp

.......back to the 70's.
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Translation from Fanfan26's post.

Basil Knight responded to Gareth Smith's comment: Gareth Smith, yeah, I drew everything, and I dealt with Koni on the rear impact unit. Strangely, I totally forgot about the whole bike until I saw it in the willys book. It was based on what the Cosworth was going to be. I look back and wish PJ had never had his accident ....... things would have been so different from what happened afterwards.

Unless that pic came form here.

 
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holtcorseaux

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Basil Knight responded to Gareth Smith's comment: Gareth Smith, yeah, I drew everything, and I dealt with Koni on the rear impact unit. Strangely, I totally forgot about the whole bike until I saw it in the willys book. It was based on what the Cosworth was going to be. I look back and wish PJ had never had his accident ....... things would have been so different from what happened afterwards.

Unless that pic came form here.


I never heard the term unité d’impact arrière. English rear shock absorber = French amortisseur arrière. Fascinating pictures, it will be interesting if any unfaired photos are unearthed.
 

elefantrider

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I never heard the term unité d’impact arrière. English rear shock absorber = French amortisseur arrière. Fascinating pictures, it will be interesting if any unfaired photos are unearthed.
Me neither. I think that was from Facebook's auto-translate from English to French, usually has some errors.
 
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lcrken

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The only reference, other than the pictures above, that I've run across about the monoshock bike is this quote from Mick Woollett's book "Norton, the Complete Illustrated History."

"Peter Williams actually tried a prototype chassis with monoshock rear suspension at the John Player meeting at Silverstone in August 1974. This had been built for the Cosworth Challenge but because this was not ready it was fitted with a Norton engine. In the big race, both Williams and Croxford retired."

Ken
 
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The only reference, other than the pictures above, that I've run across about the monoshock bike is this quote from Mick Woollett's book "Norton, the Complete Illustrated History."

"Peter Williams actually tried a prototype chassis with monoshock rear suspension at the John Player meeting at Silverstone in August 1974. This had been built for the Cosworth Challenge but because this was not ready it was fitted with a Norton engine. In the big race, both Williams and Croxford retired."

Ken
If there were pics without the fairing and it was legal for classic racing it could be duplicated and would give the Norton an edge.
 

RoadScholar

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I did some digging and found pictures of the Norton Challenge P 86 where, with some imagination applied to the pictures, appears to have worn a mono rear shock in one of its' iterations; the focus of the P 86 appears to be the collaboration between Norton and Cosworth on the engine rather than the suspension. The JPSs, based on what I saw, had 2 rear shocks.

When Grand Paul wakes up he can tell you more.

Best.
 
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I don't believe monoshock suspension would give a Norton Commando an edge. Modern suspensions usually have longer travel and probably cope better with high horsepower on rough race circuits. To get an edge with a Commando, you are dealing with limited horsepower, so you need better handling. Probably the only time monoshock suspension might be better than dual shocks would be on very rough race circuits. The amount of travel at the rear end of the motorcycle affects the way the rake on the steering head changes as you accelerate or brake. So it is not all beer and skittles. The rate of change on the rake affects the rate of transition from under-steer while braking to over-steer while accelerating and also where that change occurs.. All controlled mainly by the rear suspension. You find out you have got it wrong when you crash.
 
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John Kocinsky was very successful because he was able to power through corners with the VFR750R. To be able to do that depends on how the bike is set up, not so much the rider's ability. The rider adjusts to the bike and learns to use what the bike can do.

 

Fast Eddie

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John Kocinsky was very successful because he was able to power through corners with the VFR750R. To be able to do that depends on how the bike is set up, not so much the rider's ability. The rider adjusts to the bike and learns to use what the bike can do.

A decent drum brake and that ‘onda would be a nice bike Al...
 
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John Kocinsky was very successful because he was able to power through corners with the VFR750R. To be able to do that depends on how the bike is set up, not so much the rider's ability. The rider adjusts to the bike and learns to use what the bike can do.

John Kocinsky hot sacked by a GP racing team for revving the nuts off his engine trying to blow it up after not finishing on the podium, the engine data logger didn't lie . . . .
So much talent, so little respect. . . . . .
 
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