Which retract servo

[Alan Brock]

Which 180 deg retract servo can anyone recommend to operate mechanical servos. ( JP 5507198)

Can one servo be used to operate both retracts or should 2 be used?

[Former Member]

[This posting has been removed]

[YakMad]

I've always used the Hitec hs-75 retract servo as it's fairly cheap and once the linkages are set-up correctly (no stalling) they have been reliable. As Eric says the hard part is the linkage set-up and a stalled retract servo will drain your battery quickly or indeed fry the servo (I've done it!!)

[David Ashby - Moderator]

Hi Alan

I've used the Hitecs and they're very good. Depends on the aircraft as to how many you need. Most .60 sized warbirds and smaller use a single unit to move both legs but some ARTF models have employed one retract servo per leg in the past. Air retracts are recommended for models larger than this.

[Alan Brock]

Thanks for the info, looks like I will be sourcing some Hitecs.

Not sure if I can get away with just one servo as the plane is a Spit and the angles of the retracts and push rods look a bit awkward.

The retracts are self-locking and there is quite a large amount of movement in the pushrod at either end of the stroke before the leg starts to move in an arc so I think it won't be too much of a problem to set up.