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Futaba BLS175SV servo question

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Futaba BLS175SV servo question

Old 10-13-2022, 12:15 AM
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Default Futaba BLS175SV servo question

I'm freshening up the old war horse with some new servos and have stumbled on a bit of strangeness.

R2608SB Rx, BLS175SV (rudder). 14MZ Tx.

I put the rudder servo in, made a new model memory and servo monitor is showing -100,0,100 on the rudder channel and noticed that my rudder throw was unequal. After a bit of messing around double checking things it turned out the servo horn (big wheel, push-pull arrangement) is rotating less one way than it is the other requiring the ATV to be set 94/105 to get equal servo rotation (and rudder travel).

Am I supposed to hook up a brand new, out-of-the-box servo up to the CUI3 and calibrate the travel in that first?
I'm not using S.Bus connection so it's using the traditiional pulse width signal but the Rx is set to "high speed". I haven't tried the Rx set to "normal" or changed any other servos yet.

Looking for advice/opinions.

Edit: hooked it up to a CUI-3 and a degree wheel on the servo says that servo definitely isn't going exactly where it's being told to go. Adjusted the left/right gains to get it close and now getting equal travel with Tx ATV set at 98/102 which is close enough for me. I'm still getting 0.5-1deg differences in rudder deflection at identical incremental points (ie 10%left/right, 25%left/right) either side of neutral which could be fixed with a multi-point curve in the AFR but it's sort of pointless to do that with a rudder.

Last edited by bjr_93tz; 10-13-2022 at 01:32 AM.

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