One-inch lengths of Great Planes ( 3/8-inch Heat-Shrink Tubing keep the servos and aileron extension cables securely connected. Shrink the tubing with a heat gun or lighter.

covered. Three sets of different-size triangular servo mounts are provided. One of those sets will fit the micro servos you’ve chosen. The servo arm slot is precut into each cover, and the backside of the cover has four indentations to accept the two pins on the bottom of each servo mount. Find the correct mounts and glue them to the covers with a drop of thin CA. Keep the glue application minimal to prevent glue runs and marring of the parts.

While the CA is setting, hook up your RC gear on the bench, bind the receiver and transmitter, neutralize the programming and trims, and fit each servo arm into its correct position. Output arms are usually provided in an X shape, which generally allows the arm to be positioned at various angles. For the Paulistinha, fit each arm to result in a 90° angle, and then remove the three unwanted points of the X. I’m a neat bug, so I use a sanding drum on my rotary tool to sand the

cut edges of each arm for a smooth appearance. With the servos still at

neutral, mount the arms and secure them with the small screw that comes with each servo. Turn off the RC system and slip the aileron servos into the covers. Use the rubber grommets and brass eyelets that come with the servos and secure the servos with the included Phillips- head screws. I use 3

/8 -inch heat-shrink

tubing to ensure that the servo wires do not detach

from the necessary aileron extensions. Slip a piece of tubing over the connection and shrink it with a heat gun or a lighter. It’s not going anywhere! To help pass the servo wires through the wing, The World Models ( installs a length of string inside of each wing panel. Loosen the string in the servo bay, pass it through the connector at the end of the servo extension, and secure the string with a short length of masking tape. Wrap a pointy end on the tape to help the connector pass through the cutouts in the ribs without catching then pull the extension through. Remove the tape and string and fit the mounted servo over the bay. Power drills are clumsy in close quarters, so use a pin vise with a small drill to make the pilot holes for the servo cover screws. Drill one hole and install the first screw, which holds the cover in position while drilling the other three pilot holes. In my next installment, I’ll discuss how I install the control horns, pushrods, and clevises, and how I join the wing panels with BSI epoxy.

Use masking tape to attach the factory-installed string to the extension ends. A pointed end on the tape will help the extensions pass more easily through the rib cutouts.

Nix using a power drill. A small drill in a pin vise is easier to handle in close quarters when making pilot holes for the aileron cover mounting screws.


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