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Traction engine tyres

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mgj08/03/2011 21:04:23
1017 forum posts
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Thats because the rubbers will act like racing slicks!!
 
Your tractive effort is the torque/radius (thrust at the point of contact) However what the contact patch will sustain is coefficient of friction(mu) x weight (m x g) So if applied thrust exceeds stiction the wheel will slip.
 
So with steel strakes the wheels will probably slip (slip stall) long before max torque can be applied because mu is low - on a metalled surface.
 
With rubber you can get an interesting effect dependent on the hardness of the rubber and the load. mu can be more than 1 which is theoretically impossible. In fact what happens is that the rubber deforms and interlocks with the surface, and so you can get very high coefficients of friction, and could well permit torque stall in some cases.
 
 

 

Edited By mgj on 08/03/2011 21:05:37

John Lintorn04/04/2017 13:31:23
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66 forum posts
56 photos
Is there anywhere to procure just square/rectangle rubber sock? The price traction engine suppliers charge for a set of rubbers is in my mind outrageous!
Martin Connelly04/04/2017 18:09:48
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2549 forum posts
235 photos

You could buy rubber sheet of suitable thickness and cut slices off it. Don't know what you think is expensive.

Martin C.

Hacksaw04/04/2017 21:25:32
474 forum posts
202 photos

**LINK** Good company (apart from the unheplful jobsworth on the counter when you go in !)

Tunbridge Wells Kent

AndyA04/04/2017 22:53:41
38 forum posts
Posted by John Lintorn on 04/04/2017 13:31:23:
Is there anywhere to procure just square/rectangle rubber sock? The price traction engine suppliers charge for a set of rubbers is in my mind outrageous!

If you think stick on tyres are expensive don't even bother thinking about Vulcanised tyres!

John Lintorn04/04/2017 23:04:57
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66 forum posts
56 photos
Is there anywhere to procure just square/rectangle rubber sock? The price traction engine suppliers charge for a set of rubbers is in my mind outrageous!
John Lintorn04/04/2017 23:07:04
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66 forum posts
56 photos
Sorry didn't mean the double post!
Do you know of anywhere that does rubber sheet think enough Martin C?
JasonB05/04/2017 07:07:15
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25215 forum posts
3105 photos
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You will need quite a hard rubber with the correct shore value, too soft and it will start to creap and the bond to the wheels will quickly fail.

Reason the commercial profioles are expensive is they are made to a specific pattern not copies of bumper strip an ddue to limited demand small batches will cost more than long runs. It is not square/rectangular but tapered and with a slight crown to the top.

I have seen Vee belts turned inside out and stretched over the wheels but they start to look fluffy quite qickly and never really look the part

John Lintorn05/04/2017 08:23:22
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66 forum posts
56 photos
I'm considering getting rubber sheet in a 10m length to shore hardness 70 and then build the layers up to thickness using a vulcanisong glue and then trim to the profile.
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