Tractive force of a loco

The chrome plating of LGB locos must have some significant effect on their traction and yet most of mine rate pretty highly compared to Bachmann etc. One notable thing about my Bachmann K28 compared to the Annies is that it can't cope with so many axles as an Annie (80+ on a level dry track)despite its weight, number of drivers and sprung suspension. I notice too, looking closely at an Annie, that it is in fact a 2-4-0 as the flangeless centre drivers do not make contact with the track.
 
I suppose it comes down to weight per axle and wheel flange resistance.
 
This page has some info of drawbar pull of many locos.

http://forums.mylargescale.com/18-live-steam/30610-how-much-weight-you-pulling.html
 
Hi guys,

You might get a kick out of a couple of videos I did recently, showing my new LGB Allegra (20225) in a tug-of-war between my Ge4/4iii locomotive and also one against my USAT CN SD40-2(w). I was surprised at the results...

https://www.youtube.com/watch?v=p9bOnwz6MQU

and

https://www.youtube.com/watch?v=Oezh2VbxHNg

O0

Keith
 
Probably out pull a pre Marklin Rugens 0-8-0 !
Click to expand...

You're probably right! I was really surprised that it could hold its own against the big diesel. I tried it with an LGB crocodile and a Ge4/4ii, and it pulled them both backwards like nothing. I should also mention that I relocated two of the four traction tires to the non-powered bogies of the end units (which use regular locomotive wheels without gears)--so now each motorblock has one traction tire like most LGB locos. I didn't like the fact that there were two because in my mind it creates an internal struggle for the motor and gears during cornering. Most of the time I'm only pulling relatively short (say three) coaches anyway so I don't need the extra traction.
Keith
 
KeithT said:
The chrome plating of LGB locos must have some significant effect on their traction and yet most of mine rate pretty highly compared to Bachmann etc. One notable thing about my Bachmann K28 compared to the Annies is that it can't cope with so many axles as an Annie (80+ on a level dry track)despite its weight, number of drivers and sprung suspension. I notice too, looking closely at an Annie, that it is in fact a 2-4-0 as the flangeless centre drivers do not make contact with the track.
Click to expand...

Keith, it may be to do with the gearing, the weight of the loco (with its heavier tender) and the power of the motor. The K28 is much heavier than the Annie and its gearing is known to be of a not advantageous ratio. In fact you can push the K28 along the track and turn all the drivers, in fact the loco will run away down a heavy gradient due to this. This is not so possible with the Annie as the gearing makes it harder to turn the whole assembly by pushing the wheels. The motor in the K28, whilst being more powerful than that in the Annie, uses a bit of it available power to just to get the heavier loco with tender moving.

But the cruncher, really is the poor gearing. There is a replacement gearbox, made by a guy in the States, which overcomes this (for a hefty cost!). With 80 axles it would be prototypical to double head now and again .......so maybe k28 number 2?
 
You must log in or register to reply here.
Back
Top Bottom