"No. I'm rookie blogger.. Please send it to sirsteve68@gmail.com .."

"I had a similar problem, which was due to the BEC in the ESC not having any smoothing capacitors, which could drive the servo's fine but the voltage drop when all 4 servo's were under load would cause the APM to lock up and lock the…"

"I think I have a good plan!  I'll use the motor controller to supply 5v to the APM and R/X thru the output rail via the throttle ch.  The separate BEC will power the servo/s directly using the a power and ground via a Y harness. From…"

"The 5v and gnd pins are all tied together on the output rail.  You can run lots of current through these rails because there's no components involved.  If you notice any problems just take two lengths of wire and solder them along the…"

"A mechanical solution would be the easiest way for sure. Balance tabs if it's a control surface, do you need a huge amount of travel, why 2.5" control arms?"

"I am assuming you are talking about the elevator? if not? and another control surface then even less will be good"

"If it is likely to draw that much current? then yes... But if your aircraft is only 6 pounds then I doubt you need so much torque?, I have about 180oz on a warbird that weighs 30 pounds! I would suggest that you need a servo of around 70oz…"

"You could power the servo directly, and just run the signal wire to the APM?"

"That sounds right. You're using good quality components, I think that is always a good idea. I would use one battery, all grounds tied together. As others have suggested, maybe finding a good 5v servo is the best solution though."

"Looking at other servos was a good idea... but I'm running into some problems. The APM is restricted to 5v right...  But I also believe it is restricted to 3amps correct? My servo is a HS-5645MG which stalls at 157oz using 6v.  The…"

"You might be best to just get a proper 5V servo.  Messing with all that wiring can certainly increase your chances of frying the APM.  You could also have interference problems and ground loops and diode burnouts or other problems.…"

"What John AB, Is saying is also a valid point, if you do use a separate battery you wil need to connect the earth from that to your main battery or another earth in the circuit irrespective of voltage. The positive can be isolated to…"

"There are other ways of doing things but for example, the way I have my Tricopter wired up is as follows. I have one 3amp 5v ubec powering the apm via the output rail which then supplys the receiver and a small servo also on the output…"

"Yes, we are talking about the same thing. I usually just use a proper 5V BEC with enough juice to power everything to keep the wiring simple. But there has been some instances of people running servos on a separate battery and only connecting the…"

"One battery or two in this case it seems like it really shouldn't matter if I am using the the Castle Creations BEC battery eliminator right? So are you saying that I use just the signal pins on the APMs output side, so that just the throttle…"

"Hi John, I am quite into electronics as a hobby, and I had a sililar problem using a 5v servo running straight from the receiver that was powered from the apm2, whenever I moved the servo too much juice was sucked from the apm2 and it shut down…"

"They will need to have common ground."

"Joshua, Do I need to be concerned about something regarding grounds being supplied from different voltages?  Somebody said that might be an issue.   For some reason I'm having serious brain fade on how to separate these two power…"

"Pull JP1 jumper and give the servo rail 6v and the APM 5"

"Unfortunately the servo stalls.  So yea that presents the problem. "