Stits SA-3A Playboy (oz1959)


Stits SA-3A Playboy (oz1959) by Dale Munyon 1958 - plan thumbnail

About this Plan

Stits SA-3A Playboy. Scale homebuilt model for control line.

Note this plan is not full size.

Update 10/6/2022: Added article, thanks to RFJ.

Quote: "A Control-line scale model of a 'build-at-home' light plane, Stits Playboy, by Dale Munyon.

1/2A scale modellers seem to wind up on the short end of the stick as most models are usually designed around the larger engines - many around jets. This places the small field sport fan in the background as plans have to be resealed for use with .049 or .074 engines.

Scale models are not just a big engine class. There are those that feel size is the criteria of fine models. Big ships with engines hanging out all over the place seem to be judged as the ultimate in scale. However, a fine scale job can be made around any engine size including 1/2A. Here's a mo-el for the much neglected small engine fan.

Construction: Start with the fuselage. We suggest that you first decide which engine you plan to use and how you plan to mount it. We used radial mounting as this provides the simplest and fastest means. Should you decide otherwise, you will have to include beam mounts and it will be necessary to cut holes in the formers to mount them.

It will be necessary to carve the cowl so that it fits around the engine and also so that it clears the tank. This should be planned carefully. Tank mounting is a matter of preference and will vary with the tank selected. Allow for the tank filler tubes and clearance for the engine needle valve.

Install the bellcrank mount and bellcrank making a secure mounting. The pushrod should move smoothly without hanging up or digging. Small models require a smooth control without loose play or sloppiness. All blocks should be fitted, carved and sanded smooth.

The tail surfaces are made in the conventional manner and are hinged with cloth strips or commercial hinges. The elevator horn should be installed while making this assembly. The unit should be mounted in the fuselage. By sliding the stabilizer back and forth, it is possible to take up minor variations in pushrod length.

The fuselage construction can be completed after the stabilizer is installed. All of the top pieces can be secured in place and the rudder can be attached. Note that the rudder is offset so that it pulls to the outside of the flying circle.

Conventional construction is used on the wing. Each wingtip is propped up 1/2 inch to obtain dihedral. After this step is completed, the landing gear should be secured in place. Lash it to the wing spar with thread and use a liberal amount of cement to secure it in place. Double cement the joint to assure a substantial amount of strength.

The wing should be covered with light-weight paper. Water-shrink the paper and then apply about two coats of dope. Wheel pants are optional and if you are flying on rough ground we suggest that you leave 'hem off. Should you be one of the lucky ones with a smooth take-off surface, make the gear fairings and pants at this time.

The wing may be color doped before it is cemented in place as we did with ours. We found that it proved far easier to put the fancy trim onto the unmounted wing. Color dope to suit your taste and fancy. Assembly of the model is simple and the wing can be held to the fuselage with a few rubber bands while it dries. Make sure that the dope is dry before assembly.

First flights should be made on 25-foot lines. Good strong fishline will do fine. The line length can be increased as you gain experience but we suggest that you keep lines as short as possible since small ships react to windy weather more than large ones."

Supplementary file notes



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Stits SA-3A Playboy (oz1959) by Dale Munyon 1958 - model pic


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    ScaleType: This (oz1959) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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Stits SA-3A Playboy (oz1959) by Dale Munyon 1958 - pic 003.jpg
Stits SA-3A Playboy (oz1959) by Dale Munyon 1958 - pic 004.jpg

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