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Old 02-18-2009, 04:12 PM   #1
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Default Reedy Challenger 19T

Well I had posted a question about this motor a few days ago but now I cant find it. So here it is again. I recently returned to racing a couple weeks ago after taking ten years off, so I am a little out of tune with the whole Lipo batteries and brushless set ups. Heres what I got, I bought a FT B4, DX3S, and Reedy 5000mah 35C Lipo and a Reedy Challenger 19T I finally opened the plastic wrap on my now vintage LRP 7.1 esc (1999). Heres the problem, neither my esc or my motor is getting hot, but the car will only run for about five laps then gets real slow and then stops, so clearly my brushes are sticking. So I clean the com and the motor and it repeats.
Is this caused due to too much discharge (35C)?
My gearing is spot on for this motor so I can only assume that the battery is the problem. Is there a better brush that I can put in here and maybe sacrafice com life but be able to finish heats and 15 minute mains?

Any help would be great as I already signed up for the Cactus Classic at SRS Raceway and my funds are depleated and cannot afford to buy a brushless set up.
Thanks
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Old 02-18-2009, 04:32 PM   #2
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Here ya go!
http://www.rctech.net/forum/radio-el...ush-eater.html
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Old 02-18-2009, 05:37 PM   #3
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that reedy motor is absolute trash. its non rebuildable so now since your brushes are done, your whole motor is done
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Old 02-18-2009, 06:01 PM   #4
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Too much discharge..NO 35c is not a measurement of the OUTPUT of the battery but a measurement of the rate at which power can be pulled from it by the motor. Efficiency of the battery basically...make sence?
5000x35/1000=175
[email protected] =175 max amp draw

Others feel free to correct me if this is wrong or if you can explain it to him better.
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Old 02-18-2009, 06:03 PM   #5
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why do you divide by 1000?
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Old 02-18-2009, 06:07 PM   #6
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Quote:
Originally Posted by TNS Racing View Post
why do you divide by 1000?
To get from mah's to amps. I'm not the best guy to ask about comparing mah vs. amps.
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Old 02-18-2009, 06:15 PM   #7
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TNS:
The Challenger is easily rebuildable, and has gotten some good reviews.

The 1,000 divide is the conversion factor from amps to Milli-amps (sp?)

rook-e:
If your brushes were hanging, you're motor would definitely be getting hot, as it would if you had bad bearings or other binding issues. If the battery is known to be good then it's likely a wiring or connection issue.

What kind of connectors are you using? If you've got the 1999 era Tamiya white ones, they only handle 15 amps and I'd bet they're melted together. I'd upgrade to Deans (or even the new Traxxas or Losi ones) that are made to pass higher loads and see if that takes care of your problem.
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Old 02-18-2009, 09:05 PM   #8
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I am running the bulletconnectors that push directly into the battery. And it is wired up exactly as the LRP instructions say/show to. The tranny/diff is free moving as it should be, no binding to be found. And the motor is not getting hot. The battery is brand new only charged three times on a balancing charger. I went ahead and went through the set up again on the ESC, no change.
The other day I charged the battery and ran it in the parking lot for approximately 2 minutes, if that and it shut down. I have tried a smaller 4000mah 20c lipo and nothing changed.

The motor ran perfect once, and that was first time I used it and it ran the whole pack without any problems. The second charge is when the problem started.
Is it possible I just got a bad one?
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Old 02-18-2009, 09:29 PM   #9
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I think you should more worried about running lipo with an old speed control that had no lipo voltage cutoff. 2 cell lipo should never go under 6v.

As far as the run time issue, have you had this since the first run of this setup?
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Old 02-19-2009, 06:16 AM   #10
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hold up is it:

amps to milliamps

or

mah to amps

??
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Old 02-19-2009, 07:48 AM   #11
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1 amp = 1000 milliamps (mah= milliamp hours) electrical measurement of a batteries capacity.
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Old 02-19-2009, 11:12 AM   #12
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I already have a thread going about the Challenger's brush problems: http://www.rctech.net/forum/radio-el...ush-eater.html

I've had 2 of these motors and they go like mad when new, then suddenly go flat and lo and behold, there's NOTHING left of the brushes.

But the 2 that I've had were purchased right after the motors were released, one guy on my thread says he's had a bunch of runs through his and no problems, so I'm thinking that Reedy made a production change to a more durable brush. Haven't had any confirmation on that, so I'll wait and see before giving the Challenger another go.
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Old 02-19-2009, 08:40 PM   #13
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As far as voltage cut off on the old esc I ran the car until I couldnt easily make the doubles, then I pulled it. And this is the only set up that I have run in the car because I have only run the car the one race and thats when the problem started, pretty much immediately.
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