Choosing a Sail Servo – 7 Servo Tests

Choosing a Sail Servo – 7 Servo Tests

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2 February 2009 at 15:26 #18263
Tony Bell 2
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@tonybell2
When Hitec told me that their drum servo HS 785-HB makes 3 1/2 turns but it depends on the Tr/Rx, my mind was curious. They key is to know how the signal from the Rx drives the servo.

Hitec’s published data is confusing. They say all their servos work from 0.6 to 2.4mS pulse but their data sheets say 1.1 to 1.9mS

My two Servo Drivers show how misleading they are. HS 785-HB can actually rotate 9 times. At the exteremes of the signal pulse it rotates continuously.

All the arm servos tested showed none of the Tx/Rx systems used the full angle of rotation. My next area to explore is the use of servo stretches.

Drum Tests

Arm Tests
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2 February 2009 at 15:26 #5029
Tony Bell 2
Participant
@tonybell2
12 February 2009 at 11:02 #18439
Dave Milbourn
Participant
@davemilbourn48782
I’ve had some correspondence with Tony and done some testing on the ACTion P96 ServoMorph unit, connected to a Hitec 785 winch servo and using a Ranger 3 radio. Without moving the trims, the winch rotates approx 4 turns end-to-end without the P96. With the P96 in circuit, end-to-end rotation at “full stretch” is increased to approx 7 turns. You can also decrease the rotation down to around 1/2 turn if you need to.

PM me or check the ACTion website for further info.

Dave M
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