Can someone please advise me, is there aspecial servo needed to be used with the Robart Air Retracts or can one just use a standard analogordigital servo ?
Thanks
dutchy50

If you mean to operate the air valve the answer is no. Any servo will do even a 9g one if you keep the valve free and just lubricated.

As mentioned you can use a standard servo, however you need to cut down the throw so the servo does not bind or damage the air valve. This is easy with a radio that has end point adjustments. Good Luck, Dave

I'll just point out that a 180° retract servo is available, which requires no current draw when locked in either direction. As David Agar alluded, this requires that your setup is precise, or the linkage has an overtravel feature, because the retract servo only has two positions - full one way, or full the other.

You will also notice that your retract channel (at least, on every radio I've encountered) does not provide proportional control or adjustable endpoints. This does not lend itself well to the conventional proportional control servo. I suspect if you were to use an ordinary proportional control servo, you would want to connect to a spare proportional channel.

Good luck,
Dave Olson

Don't confuse the guy with apples and oranges. He is talking about a servo for the air retract valve, not a retract servo for mechanical retracts. Big difference. Most servos used to operate the air valve can have their travel reduced via endpoint adjustments - no problem. Mechanical retract servos are a different animal. These are not normally proportional servos (JR makes both a proportional and a non-proportional retract servo) and travel 180 degrees and back to 0 degrees without stopping anywhere in between, regardless of what you do with the endpoint settings in the transmitter. Kurt

I use microservos to save weight, the shorest possible servo arm, and as has been said, adjust the end points so its not stalling the servo.

Thanks everyone for getting back to me!

Bosarth
Thanks for your input, can you tell me which servo you maybe using if you have Air Retracts?
dutchy50

I have used nothing better that a cheap Futaba148 and have never had a problem. A mini HS225 or HS-85 would also do the trick. I enjoy air retracts over mechanical but I still dabble with both.

Kurt