Battery/RC in the Lionel BN GP20 w/sound - myLargescale.com > Community > Forums


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Old 02-09-2017, 12:39 PM   #1 (permalink)
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Default Battery/RC in the Lionel BN GP20 w/sound

A friend got me one of my favorite diesels, one of the power hungery 4 motor GP20's in BN cascade green. One of the few diesels that can run on my outdoor railway. I know there is little room in the powered unit for onboard battery power. And I would like to retain the railsounds as the sounds pretty darn good to my ears. I have the chance to pickup the matching unpowered diesel. I could put the batteries in the trailing dummy engine along with the RC. But what RC will not blow up the rail sounds boards? Need straight DC and no PWM. I have also considered making the powered unit single axle drive on each truck, eliminating one motor on each to reduce power draw. I do not pull long trains, so she would have plenty of grunt for my needs. Or has batteries come far enough to support the 4 motors and sound if I stuff a single big battery or a pair of smaller ones in the dummy unit? Thanks Mike
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Old 02-09-2017, 01:00 PM   #2 (permalink)
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You can filter the PWM from the RC system to pretty clean DC:

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Old 02-09-2017, 01:03 PM   #3 (permalink)
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Ok, who's circuit is that? Something from Crest?
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Old 02-09-2017, 03:30 PM   #4 (permalink)
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Notice the Crest part number on top? (They all start with "CRE" as in "Crest", just like Aristo parts start with "ART")

RLD has them in stock, you can also buy them from the new Precision RC company who has taken over the Crest product line.

I will provide links to make your life easy:

http://rldhobbies.com/pwctolinearboard.aspx

(Precision RC only shows the new "active" board, and it's $70 so forget that one)

Regards, Greg

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Old 02-09-2017, 03:40 PM   #5 (permalink)
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Thanks Greg, I figured the "cre" in the part number ment it was a Crest board. Mike
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Old 02-09-2017, 04:32 PM   #6 (permalink)
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No problem... I think those boogers draw a lot of current, but they are pretty bulletproof... too bad Lionel did not continue in the LS market outside of toys.

If Lionel had kept going and MTH would have kept production going on the locos (instead of doing runs only once in a number of years), a guy could do some decent 1:32 modeling.

I almost went 1:32, but the lack of manufacturers, the flakey DCS in the MTH (not suited for outdoors or simple electrics) and how small it looked on the ground took me to 1:29.

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Old 02-09-2017, 05:51 PM   #7 (permalink)
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I have seen someone fix the swinging pilot issue on them and really detail up the bodies. Not a bad looking engine for the era of large scale they came from. Typical Lionel styling for the era. It is a shame, one of thier Atlantics with a reworked chassis, metal wheel sets would probably sell well today, or a 2-8-0 chassis under the same boiler. The diesels just needed an updated power truck with a single motor driving both axles instead of 2 motors and toothed belts or 4 motors. I am wondering how much thier pulling power would be cut if I removed 1 motor in each truck, say dropping the inboard motor on both. I might pull 5-6 cars max most of the time. Plus the dummy engine I plan to get to hold the batteries and crest reciever and PWR board you posted. Feed the lead unit thru a 2 prone jumper(MU)cable to the track power feeds. Mike
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Old 02-10-2017, 12:40 PM   #8 (permalink)
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Why do you want to take a motor out? Battery life? Should be little difference, power is used up by the effort needed, not the number of motors.

2 motors will draw about the same current as 1 given the same loads. Been proven over and over. The issue you may have is that the motors are not very efficient in the first place, but no reason to take one out.

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Old 02-10-2017, 08:03 PM   #9 (permalink)
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This is true, and yes I was thinking of battery life. I should be able to fit a decent size battery in the non powered/non sound trailing locomotive. Will talk to Robbie at RLD about what batteries to fit. I want max run time, so I will go as big as I can fit. Mike
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Old 02-10-2017, 08:08 PM   #10 (permalink)
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that sounds like a good plan, stuff the other loco with batteries
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