Push To Test (oz14307)

About this Plan

Push To Test. Radio control sport pusher model.

Quote: "I have designed a number of pusher configured model aircraft. The Push-To-Test model was conceived to accomplish several goals. First, all of the pusher designs that I have modeled have been scaled full-scale designs or for competition. I just wanted to design a pusher model aircraft to fly for fun and demonstration. Second, I am conducting a pusher propeller development program and wanted an aircraft to use for these tests. To accomplish a realistic propeller development program, there needs to be a platform that can provide feedback on how well the new propeller's configuration's perfor-mance compares to baseline performance. To supply this platform, I designed a .90 - 1.08 2-stroke / 1.20 4-stroke model that can incorporate a data downlink system which provides the needed feedback. The data downlink system is the subject of a previous article (RCM March 1997).

The design of the Push-To-Test is based somewhat on the Pattern Pusher (oz7335), the subject of a previous article, with increased wing area and an uncowled engine. It incorporates, like my other pusher designs, the use of a propeller extension which moves the engine's CG as far forward as possible. To keep it simple and light, a fixed landing gear was chosen. However, it can be built with retracts. As with any of these pusher/rear engine configurations, the builder must understand the requirement for lead ballast to obtain a proper CG location.

Construction: Fuselage: Glue F- 1A to F-1. Temporarily instal! the engine mount and secure T-nuts for mounting the engine. Mount the nose wheel steering bracket F-4. Temporarily mount the ballast boom and install T-nuts for later installation.

Make two each fuselage sides. The blank can be made front 1/4 x 4 x 48 in balsa sheet and a 1/4 x 3 x 48 in balsa sheet glued together. The top tear straight section should be used as the reference, Cut the sides from these blanks. Mark the locations for the bulk-heads and glue in place the 1/4 in triangle balsa stock and 1/16 plywood doubler, When dry, glue to the right side F-1, F-2, F-3, and F-4. Make sure the bulkheads are square with the side.

After the bulkheads dry, glue in place the left-hand fuselage side. Next, glue to the bottom of the fuselage the aft lower 1/4 in balsa sheeting. Glue in place the 3/32 balsa cross-grain above and aft of the fire call F-1. When dry, use thinned epoxy to coat the area of the inside of the fuselage forward of F-1 . Mix epoxy and cut fiber-glass fibers to make a paste to secure the corners of the fire wall F-1. Glue on the fuselage the 1/4 in top sheeting and the 3/8 balsa forward bottom sheeting..."

Direct submission to Outerzone.

Scan by MarkD, cleanup by Circlip.

Supplementary file notes

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