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Pros & Cons - 'DelTang' & 'S-Cab' Radio Control ?
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 Posted: Mon Dec 24th, 2018 10:15 am
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davecttr
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Tom Harbin wrote: davecttr wrote: Tom, Check out the graph on the Pololu page.

You can see using a 1S battery with a 250mA loco should give 80% efficiency even when the battery is nearly depleted.

Contrast this with a 2S battery and you get over 90% efficiency with a 600mA loco!

I usually install 2 batteries in locos needing more than 250mA.


Dave,

Looks like I'm going to need to buy a new meter and set up some kind of DC supply if I want to do this right.
I bought my multi-meter back when I became a computer tech, 1973, it doesn't know what a milliamp is, well not very accurately.
My last DC train supply blew up eight years ago and gave me the excuse to go to DCC.
I think I have some old battery holders squirrelled away somewhere though.

I like the idea of limiting an engine's capacity based on its type.
A tender loco should have more range than a tank loco.

Tom


Tom, I had no DC supply so no way of checking the Amps needed by the loco, so I did it this way.

I set up a DelTang RX/Pololu combination in a wagon of some sort and fed the output to the motor.
Then I installed a 100mAh battery and ran the train until the RX's onboard safety cutout operated at 3 Volts.
You need a wire on the 'L'-Pad to do this.

A 100mAh battery should provide 1 Amp for 6 minutes, so if your loco and train stopped after 24 minutes, the loco is rated at 250mAh.
You can do this with any battery size.
You need a continuous circuit to do this and it is best to isolate the loco pickups because a short circuit on the track will fry the Rx.




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 Posted: Mon Dec 24th, 2018 01:24 pm
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bobquincy
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I do enough motor testing that I set up a "dyno" car with an ammeter to check motor current under running conditions.

For this application I prefer an analog meter as they don't jump around as much as digital.







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 Posted: Mon Dec 24th, 2018 02:26 pm
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davecttr
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That's neat, how big is it?

Could the ammeter be mounted vertically?





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 Posted: Mon Dec 24th, 2018 03:03 pm
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Tom Harbin
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" Tom, I had no DC supply so no way of checking the Amps needed by the loco, so I did it this way.

I set up a DelTang RX/Pololu combination in a wagon of some sort and fed the output to the motor.
Then I installed a 100mAh battery and ran the train until the RX's onboard safety cutout operated at 3 Volts.
You need a wire on the 'L'-Pad to do this.

A 100mAh battery should provide 1 Amp for 6 minutes, so if your loco and train stopped after 24 minutes, the loco is rated at 250mAh.
You can do this with any battery size.
You need a continuous circuit to do this and it is best to isolate the loco pickups because a short circuit on the track will fry the Rx."


- - - - - - -


Dave,

This is just plain ingenious, imagine using math instead of yet another tool.

Seems like when I play with trains I shut off my thinking cap.

Great solution.

Tom


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 Posted: Mon Dec 24th, 2018 03:20 pm
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Tom Harbin
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Bob,

This is a great idea!

What I really like is being able to check the load under actual conditions like grades.
Even though I only have 2% grades they definitely affect the load.
I'm thinking maybe a small flat car with leads to reach the engine.
That way I could even put together a typical lash-up and check it out.

I got leery of grades and loads when many, many years ago I attempted my first Christmas layout.
I slapped a bunch of HO track on half of a Ping Pong table top with like 6% grades,
and put my very favorite train on it, a Rivarossi Old West train.
"On the second day of Christmas my 4-4-0 gave to me, two warning smells, and a totally fried motor."

Tom


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 Posted: Mon Dec 24th, 2018 03:26 pm
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bobquincy
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My ammeter is 45 mm square (about $8 on ebay).

It could be mounted vertically, but since I do most of my testing on the floor, it is easier to see when mounted horizontally.

I *really* need a tabletop test track! :)





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 Posted: Mon Dec 24th, 2018 03:36 pm
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davecttr
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Thanks Tom

By the way it is a special day tomorrow, it is Christmas!, no snow or even frost.
Never mind.

I have washed and polished the glasses, the steak is defrosting and there is enough food to last a week.
Perhaps I will sneak off for a couple of beers tonight.

Merry Christmas and a Happy New Year (other greetings of the season are available)




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 Posted: Tue Dec 25th, 2018 03:00 am
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Rick Dow
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Dave and Everyone Else Here Too!! -   Merry Christmas from Canada

Rick



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 Posted: Tue Dec 25th, 2018 02:00 pm
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Tom Harbin
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All,

Merry Christmas. I hope you all have a wonderful day.

Tom

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 Posted: Thu Dec 27th, 2018 10:52 pm
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Bob D
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Tom,

I model in O-scale and have converted about 18 engines from DCS/TMCC to BPRC using the Rx65b and various transmitters from RCS Australia. 
My batteries are 9.6v or 12.0v, 2000mAh, NiMh, or 11.1v 220mAh LiPo packs. 
I get approx 2.5 hours of run time, and it takes about that long to recharge them.

I've attached a diagram I use to wire an engine with a single motor, it incorporates a charging circuit also. 
I generally mount the on/off switch and charging jack under a false coal load made of foam rubber. 

There should be a load of photos in my album on the forum here.







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