Bachmann Message Board

Discussion Boards => General Discussion => Topic started by: orangetrainman on October 21, 2008, 04:55:05 PM



Title: BACHMAN SPECTRA 83605
Post by: orangetrainman on October 21, 2008, 04:55:05 PM
Hello i have a bachman #83605 loco  that i bought from a dealer on E-BAy and i would like to know  how many cars whill this engine pull safley withouthaving to add weight[pleasecontact me at orangetrainman33@yahoo.com
thank you
george.


Title: Re: BACHMAN SPECTRA 83605
Post by: PRRThomas11 on October 21, 2008, 05:44:47 PM
It depends on the condition of the engine.

Try it out and see.

-PRRThomas11


Title: Re: BACHMAN SPECTRA 83605
Post by: Yampa Bob on October 22, 2008, 02:17:30 PM
There are too many variables to give a simple answer. For about $70 plus shipping, you can do your own testing for drawbar pull. 

http://www.hmcelectronics.com/cgi-bin/scripts/product/4640-0004/

Pulling force required for easy rolling cars is reported to range from .07 ounce to .2 ounce, depending on who you ask.  I have no idea, so I just tune my cars so they will coast down a 1% to 2% grade. Ream the truck journals and use metal wheelsets.  Keep the cars light as possible yet still maintain good tracking without derails. Perfect trackwork allows use of lighter cars.

If the tester shows a drawbar force of 3 ounces at drive wheel spin, then 3/.15  (average) =  20 cars, which seems reasonable for a Connie. Other's mileage may vary.

To pull more cars, add weight to the loco, but the wheels must slip/spin at maximum drawbar pull to avoid motor burnout or drive train damage.

I hope this helps.