"Ganging" Non-digital servos.
12-14-2004, 10:42 AM
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"Ganging" Non-digital servos.
I know with JR digitals you can use a matchbox and with the Hitec digitals you can program them. How did guys, years ago, with 40% models using 3 non-digital servos per aileron (or two per elevator and I'm looking at Futaba specifically) gang them together, ensuring no fighting with one another.
While fighting with one anouther is not good, I understand it is less of a problem with non-digitals since the non-digital does not draw nearly as much lead in trying to keep the servo centered. Make sense?
Ryan
While fighting with one anouther is not good, I understand it is less of a problem with non-digitals since the non-digital does not draw nearly as much lead in trying to keep the servo centered. Make sense?
Ryan
12-14-2004, 11:25 AM
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RE: "Ganging" Futaba non-digitals.
Ryan, I have not ganged 3 together, but I have 2 planes with hitec 645s ganged together on the ailerons. I just used the same size arms and put good tight linkages on it. I adjusted the control rods until there was no whine in the servos. I have flown this setup for a couple of years with no problems at all. Strange since I have had more than one person tell me that this setup will NOT work. Just don't tell my planes that! Hook them up the best you can then keep a careful watch on your battery voltage for the first few flights to make sure you don't have unnecessary battery drain due to them fighting each other.
12-14-2004, 11:29 AM
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RE: "Ganging" Futaba non-digitals.
The key is symmetry in geometry...keep the linkages as close to the same as possible, then adjust until they work in unison. Good luck!
12-14-2004, 06:36 PM
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RE: "Ganging" Futaba non-digitals.
ORIGINAL: Ryans Rebel
I know with JR digitals you can use a matchbox and with the Hitec digitals you can program them. How did guys, years ago, with 40% models using 3 non-digital servos per aileron (or two per elevator and I'm looking at Futaba specifically) gang them together, ensuring no fighting with one another.
While fighting with one anouther is not good, I understand it is less of a problem with non-digitals since the non-digital does not draw nearly as much lead in trying to keep the servo centered. Make sense?
Ryan
I know with JR digitals you can use a matchbox and with the Hitec digitals you can program them. How did guys, years ago, with 40% models using 3 non-digital servos per aileron (or two per elevator and I'm looking at Futaba specifically) gang them together, ensuring no fighting with one another.
While fighting with one anouther is not good, I understand it is less of a problem with non-digitals since the non-digital does not draw nearly as much lead in trying to keep the servo centered. Make sense?
Ryan
All my giants have ganged servos, at least on the elevator.
Ganging servos, analog or digital, means you really should build the linkage right and not depend on neutralizing linkage errors with the electronics. While you can _do_ that, it does not make for a robust installation, IMHO.
Photo shows the latest effort, 1/3 scale L-4 with a whopping great set of tailfeathers - paired Futaba S5301s on the left drive the elevator. Single S5301 on the lower right drives the rudder through a Nelson ball-bearing bell-crank, and the throttle servo on the upper right is an S148 retrofitted with the EMS ball bearing top.
466 in.oz. worth of Oomph! on that elevator setup, no fuss, no fighting, nada.
