About this Plan
Pusher. All-sheet rubber sport model.
Quote: "All balsa, lightweight for sports flying. Full size plans on centre pages. Pusher, by Ed Lidgard.
THIS MODEL is one phase in the development of pushers as a contest design. A 200 square inch version of this design was built and flown literally 'off the board'. Wing and elevator aspect ratio was greater and the rudder was slightly smaller to compensate for scale effect.
The profile was a worthwhile effort to prove out prop shaft angle, dihedral, proportions, etc. So if you wish a larger version using different construction technique, proceed with confidence. A carefully built folding prop will align perfectly with both blades, matching together like hands at prayer. Zero angles make the job simple and the distance between hinges need only be 5/8 in.
Pusher is easy to build. Choose lightweight wood for wing, tailplane, prop and rudder. The body requires medium 1/16 in with 1/32 in rubber channels of the same weight. Warp-free stock is absolutely necessary. Sanding with very fine paper is only needed around all edges. Tapering, except at the propeller trailing edge, can be omitted.
Camber is built into both wing and tail. You may be sceptical of sheet wings without ribs, but it works, is lighter, cleaner and more efficient. Carefully pin both centre panels down over a 1/8 in square 1 in from the root leading edge. Carefully sand the tip so that it exactly matches the cambered centre section when the tip is blocked up 1-1/8 in. Use white starch glue such as we would buy at the hardware shop in a plastic bottle. This type of glue doesn't 'pull' and, therefore, does not contribute to warps, Put the wing away and go on to something else for several hours. Then prepare to glue the centre wing joint. Leave one panel pinned down and sand both matching edges until a perfect match is achieved. One dihedral joint will be blocked up 1-1/2 in to get the correct angle. Take care not to pin down too hard and make the wing twist.
The fuselage hardly needs any comment, it's so easy. Glue two 5/16 in wide 1/32 in strips into a 90 degree angle and glue the angle on one side of the slot in the fuselage. Add the 1/32 in plywood (or heavy paper) to the nose to prevent splitting. Bend the landing gear and glue it in place. Any plastic wheel approximately 3/4 in diameter will be fine,
Draw a centre line on the tail and, with it as a guide, glue the tail on the bottom of the fuselage. Hold until dry. Be sure it's square to the fuselage. Don't put too much glue on at first..."
Hi Steve - Here is Ed Lidgard's Pusher from Aero Modeller magazine issue 11-68. This is a full size 'centerfold' plan scan.
Direct submission to Outerzone.
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