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12-29-2009, 05:02 PM
| #1 |
| Quarry Creeper Join Date: Apr 2008 Location: Clay, Alabama
Posts: 337
|  Full Sized Servo + Stock ESC = Problem?
I'm running the stock ESC with a HH mini-torquemaster on 2 cells - I recently replaced the servo with a cheapo full sized. (planning to move the HS654MG from my big crawler when I replace it) - anyway, today was the first time I've ran it with the full sized servo, and I found that if the wheels are turned, the motor stalls... I'm guessing that's an issue with the ESC, correct? I really like the drag brake on the stock ESC, but if it's got to go, it's got to go... what do you recommend as a cheap replacement?
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12-29-2009, 05:17 PM
| #2 |
| RCC Addict Join Date: Oct 2007 Location: Kennewick, Washington
Posts: 1,382
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I've been running the stock ESC and a 645mg servo for a year with no issues.Start replacing one thing at a time back to how it was ,you will eventualy find the source of the problem.
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12-29-2009, 05:36 PM
| #3 |
| I wanna be Dave Join Date: Mar 2009 Location: sittin in the sky
Posts: 4,630
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bec unit- enough said
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12-29-2009, 05:37 PM
| #4 |
| Rock Crawler Join Date: Feb 2004 Location: Near Pittsburgh, PA
Posts: 911
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Do you have some sort of low voltage alarm for your Lipo? Maybe you damaged it and it's low on power. I only did one comp running the stock ESC and motor, full sized servo with a castle BEC on 2 cells and had no problems. |
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12-29-2009, 08:28 PM
| #5 |
| Quarry Creeper Join Date: Apr 2008 Location: Clay, Alabama
Posts: 337
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I thought about a BEC, but I thought that would go the other way... Meaning that the BEC would keep the motor from taking power from the servo. This appears to be that the servo is taking power from the motor. I actually only went to the full sized servo because the mini servo that was on it let the magic smoke out, and all I had to put in it was a full size. I don't **think** it's the battery, because even under a big load, there is plenty of power as long as I don't try to turn the wheels. |
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12-30-2009, 06:41 AM
| #6 | |
| Quarry Creeper Join Date: Dec 2009 Location: Jacksonville, FL
Posts: 273
| Quote:
The BEC takes power from the battery and sends it to the servo, thus relieving the servo load from the ESC. This way the ESC only has to run the motor. Also running a BEC allows you to send more power to your servo, which will make it perform better. It sounds like your just trying to pull too much power from the ESC with the motor and servo. The BEC should help the problem. | |
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12-30-2009, 09:07 AM
| #7 | |
| Rock Crawler  Join Date: Mar 2009 Location: West of Eugene, OR
Posts: 942
| Quote:
The Castle Creations BEC is the popular choice.  | |
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12-31-2009, 04:17 AM
| #8 | |
| Newbie Join Date: Dec 2009 Location: Dogpatch
Posts: 4
| Quote:
If at full turn we are back to end point adjustments on Tx. If any amount of turn it's a bad servo or installed wrong. If the ESC and motor or in good working order, you should not have any problems if the end point adjustments or correct on the Tx. Using a correctly set up servo horn/wheel with an adjustable steering link (from the horn) is about the only way to get the end points 50/50 if using the STOCK MRC Tx. I'm using a 645mg with stock ESC & motor with 2c (x2). I am shocked at just how good the stock parts are. When parts show up I'm adding 4ws, (only then) I do expect the motor to stall in HIGHT TRACTION area at full 4w steering lock "only" because the f/r diffs are locked. | |
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01-06-2010, 01:31 PM
| #9 |
| Pebble Pounder Join Date: Feb 2009 Location: Hoodsport
Posts: 169
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I just picked up a fullsize cheep servo and the bec the guy at the hobby store said that it would stop the power drain to the motor and not burn up my esc so im going to hook it up and see how it does.
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