Class 2, in Blue - S&DJR 2P

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grovenor-2685
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Re: Class 2, in Blue - S&DJR 2P

Postby grovenor-2685 » Thu Dec 22, 2016 11:21 pm

IMHO, a rule of thumb would be to have L1 = L2/2 so 2/3 of the weight is on the drivers, err in the direction of increasing the share on the drivers, eg L1 = L2/3 rather than the other way.
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Keith
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MarkS
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Re: Class 2, in Blue - S&DJR 2P

Postby MarkS » Sat Apr 22, 2017 9:24 pm

So, finally after being interrupted by work for way too long, I returned to the 2P - I re-read the wisdom offered in this thread and went back to Will's treatise and read it slowly.

The fog started clearing - I started by cutting the rear shaft on the motor and fitted some lead (12-14 g) at the back of the firebox . It resulted in an improvement to tractive effort, but not much, odd...
So, I checked the wires on the front bogie, 13 thou, Oops! (I wonder if the front drivers were actually touching the track?)
Now replaced with 10 thou, buffer height still OK. I tested again, much better!
Lastly, I took out a 8-10 gram weight that was in the boiler - marginal improvement, in reverse. (I use the same rake of coaches on the same track each time I test.)

Anyway, the 2P will now pull all that will be expected of it for the time being.
Cheers,

Mark.
"In the end, when all is said and done, more will have been said than done..."


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