Peppy Trainer (oz12784)

 

Peppy Trainer (oz12784) by Bill Winter from Air Trails 1950 - plan thumbnail

About this Plan

Peppy Trainer. Control line trainer model.

Quote: "Peppy Trainer by Bill Winter. This job's built to take it; limited maneuverability makes it ideal for club instruction; all wood sizes are standard at most any hobby shop.

If the Peppy Trainer looks like a lot of other U-control models but isn't, blame the dozen distinguished kibitzers who had a hand in its design. The development of a trainer for magazine presentation proved to have many odd ramifications. Talks with editors, expert flyer-designers, hobby shop dealers and modelers brought out many requirements that ordinarily wouldn't meet the eye.

In consideration of the people who would build the model and therefore have to buy materials out of dealers' stocks, standard size sheets and strips had to be used and these in a minimum number of sizes. Cost must be held down. It all added up to a healthy respect for the kit manufacturers who bring you so much for so little.

For instance, it was found that one leading edge size, usually considered easily available, would have cost 75c at the average hobby shop, for you'd have to cut it out of a small plank. Random specification of sizes frequently doubled, even tripled the cost, as compared with similar size kits. There was the interesting additional factor that kit design could not be followed, inasmuch as builders of magazine projects do not have prefabricating machinery worth thousands of dollars at their disposal.

As to the design itself, it was felt that standard performance could result from the use of standard engines for the particular airplane, specifically an .09. The airplane is shown with the McCoy, but may be flown with a Cub .09 or the small Arden.

Since 'timbers' could not be used for the triple reasons of cost, shaping difficulties, and weight, ft was decided to use a sandwich construction of sheet balsa in the fuselage, and a built-up wing. You'll find the directions interesting, therefore, even if you don't build the airplane.

The fuselage consists of three plies of sheet, a 1/4 in center ply and the two outer plies of 1/8 sheet. The thick center ply is not full length and is out to outline (full size on the plans which may be obtained from the plan service). Two strips of 1/4 in square run along the top and bottom edges of the fuselage toward the rear and a few cross-pieces complete the structure, with the outside plies being cemented in place. The top of the canopy will have to be butt-jointed as the depth at this point exceeds three inch stock.

The edges may be rounded off with the exception of the front edge behind the engine, the wing cut-out edge where the wing will rest later, and the small portion that supports the stabilizer. The result is a fairly light semi-profile body that is not shaped from an expensive piece of wood.

The motor mount has been fabricated from pieces of standard 3/8 square hardwood. This stock is cut into four pieces which are then cemented side by side for the necessary U-shape and width. The finished mount slides into the special slot at the front of the fuselage. The landing gear is bent from 3/32 wire and slides down over the fuselage and through the holes drilled in the mount. The gear goes through the mount before the ends are splayed outward for the wheels. Two bottom blocks further lock the mount in position and give support beneath the engine. The McCoy crankcase requires very little cut-out.

The engine is mounted with four 2-56 machine screw bolts from your dealer or hardware store. Note that the holes are drilled in such manner that offset thrust results, pulling toward the outside of the circle. Soldering the nuts to a piece of tin or brass which then glues beneath the mounts is desirable but is a fairly difficult operation. The nuts may be locked in place with cement by mounting the engine and tightening the bolts. Locate the bolts before shaping the bottom blocks or cementing them in place..."

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Peppy Trainer (oz12784) by Bill Winter from Air Trails 1950 - model pic

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* Credit field

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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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