Two identical servos that aren't...identical? - RC Groups
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Jun 28, 2003, 07:43 PM
Superhero, Third Class
astroboy's Avatar

Two identical servos that aren't...identical?

In my recently-finished Beech18, I used CS26BBs and an FMA servo reverser for the mains retracts. I found that I couldn't get them to quit stalling altogether in the up position, but if I backed off a couple of clicks on the retract switch(it's a slider), the growling stopped without the wheels starting to lower. Well, one leg collapsed on the model's second landing, stripping the servo's gears, so I replaced them with HS85MGs. Now, when I back off the up position to stop the stalling, one servo immediately starts to move, so that when the stalling stops, that wheel is slightly lowered.

I don't know why one servo would start to move when the other doesn't. Is there something user-adjustable inside the servo that would allow me to put them in better sync with each other?

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Jun 28, 2003, 10:01 PM
Registered User
Mr.RC-CAM's Avatar
JR offers their "Matchbox" to allow for perfect servo matching. Futaba has a similar device. Without these gadgets it is a tough job to get them all to behave well together when used in tandem.

Click to see the matchbox device.