This is the Low Profile Retract Servo by Hobbico.
     This Servo is Non-Proportional (Travels 180 degrees Without Stopping).

FEATURES: Cored Motor Design.
          Universal Connector Fits Futaba, Hitec, JR, KO Propo, Airtronics Z,
            and Tower Hobbies. KO Propo.(Does not fit old Airtronics "A" plug.)
          Travels 180 degrees - full-lock to full-lock -- to hold your gear in
            position securely. Not proportional. Perfect for mechanical
            retract installation.

INCLUDES: One Low Profile Retract Servo
          One Servo Accessory Bag (horns, grommets, screws, bushings)

SPECS:    Torque: 90 oz/in
          Weight: 1.23 oz 35grams
          Speed:  .5 sec @ 60 degrees
          Length: 1.73"
          Width:    .9"
          Height:  1.0"

COMMENTS: A retract servo is a very specialized servo. It is non-proportional,
            going 180 degrees, "lock to lock". They are made specifically for
            mechanical retracts to lock the gear in the up and down positions,
            and DO NOT have any means of end point adjustment and can not be
            adjusted by ATV on a transmitter. They are only able to go 180
            degrees and provide full maximum available torque at the two end
            points. This is their whole purpose and intentional design. If
            someone has a unique design situation where they need other than
            180 degrees available, they must use a proportional servo, not a
            retract servo. They are specifically designed to withstand constant
            holding loads in the up and down positions, unique to the use of
            mechanical retracts.
            Pneumatic retracts do not need a retract servo.  A proportional
            standard or mini servo is used to move the air valve back and forth

                                                                        8/20/99
                                                                          ir/jl