MICRO MECHANICAL RETRACT SET - with LOCKING trunnion

Mechanical retracts are operated by an external servo with a pushrod.  This small 3D-printed retract unit is designed with an "activation pin" which slides along a guide to lock the gear in the up and down positions. 

This item is "Landing gear retract rc V2" by user "cerro94" on Thingiverse: https://www.thingiverse.com/thing:1418261 and is licensed under Creative Commons - Attribution.  It was NOT designed by Rabid Models. Rabid Models is manufacturing & packaging the part in a size that's appropriate for small model airplanes!

Please read this presentation carefully, as there are some interesting features:

1) The locking retract is intended specifically for lightweight RC models (less than one pound flying weight). For best results the wheels and tires need to be as small and light as possible. It uses 1/16 wire for the gear leg (not included).

2) The retract is operated by a small micro servo and a pushrod (not included). The plastic frame holds a trunnion (the moving part) which holds the 1/16" wire landing gear leg and there is an activation pin which must be attached to the servo pushrod. We recommend using a 4.3gm metal-gear servo to operate the retract, or a 9gm metal-gear servo to operate both retracts.  There is a 90-degree range of movement.

3) The frame measures just over 1" long, 1/2" tall, and 9/16" wide. Total weight is only 3.6gm per unit. Its designed to be mounted between two mounting rails (balsa wood) that are 9/16" apart. The activation wire (servo pushrod) should be 0.47" wire, and the trunnion uses 1/16 wire for the pivot axle. These wires are not included.  The customer will need to cut 1/16" wire for the pivot axle and landing gear leg, and then carefully install the retract with a 0.047" pushrod and make adjustments in order to set the proper geometry and operation.  The normal setup is for the landing gear to fold in towards the fuselage with the servo mounted towards the center of the fuselage.

The parts are very small and we expect the activation pin or trunnion may break under certain conditions (hard landings). Dear customer, please realize that its preferrable for the retract to break instead of breaking the wing! Split plastic can be carefully fixed with CA glue, however we also offer spare parts if you need them.

This item as sold as a PAIR (2 retracts). We've made a short video showing how it's put together and how it works. The video shows a slightly larger version of the product made for development. Here is the link: https://youtu.be/x82LlIS1B7A

                     Showing "UP" and "DOWN" (without the gear leg)

This retract is sold in a set of two units with extra activation pins included.

Tools and items required: 1/16" drill bit with pin-vise, 1/16 wire for trunnion axle and gear leg, 0.047" wire for pushrod, servos, micro-pushrod connectors, small screws or Foam-Tac glue for mounting, CA to glue in the gear leg. These items are NOT included but Rabid Models offers CA and Foam-Tac glue, micro servos and micro pushrod connectors separately.