[modeleng] Re: Traction Power

Hve you actually measured pull or load though Clif? It sounds more as if 
your 47 lbs is the load equivalent, not the traction / motive force! What 
size loco and/or motor are we talking about though please?

Tony.


----- Original Message ----- 
From: "Clifton Walker" <clif.gwr@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, August 25, 2007 8:58 PM
Subject: [modeleng] Traction Power


> Hi All,
> When I was up at the Harrogate show, one of the many trade stands had some 
> very nice dial type scales for a £1.
>
> I have always had the idea to put a set of scales as a coupling between a 
> loco and the riding car, just to see what pull the loco was exerting so I 
> purchased a set. Last of the big spenders, thats me.
>
> Today having a run in the garden with one of my electric locos I gave it a 
> whirl.
>
> She could give 47 lbs pull before wheel slip occured.
>
> Now the only reference I have got is from Greenlys book on loco design 
> which states that 1lb traction can pull 25lbs load.
>
> If I multiply 47 X 25 I get 1175 pounds. If I then divide by 160 lbs as 
> the average persons weight this give a passenger load of seven including 
> the driver.
> The snag is that I know that this loco can easily pull 10 passengers plus 
> the driver so  what is wrong?
> Does anybody have any better info about traction to load ratio.
>
> Has any body else got any traction figures for various locos as a matter 
> of interest.
>
> Regards
>
> Clif
> MODEL ENGINEERING DISCUSSION LIST.
>
> To UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
> line.
> 


MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: