Mac Seventeen (oz7992)

About this Plan

Mac Seventeen (Mac 17). Radio control sport aerobatic model, for K&B .35 power.

Quote: "1964 Nationals Class II Winner - The Mac Seventeen. Clean lines, all sheet construction, and an ability to perform aileron maneouvres characterize this remarkable class II design. Mac Seventeen by Lloyd Sager.

We decided to name this model 'MAC SEVENTEEN' since it is the seventeenth in a series of models designed by DB McDonald, otherwise known as Mac. Early in 1958, Mac designed and built No.1 which was a rudder only job made strictly as a trainer. It performed so well that in the subsequent years 16 others with numerous variations were built in order to experiment with the basic design capabilities. These models included a bi-plane, a low wing multi version, and many of the shoulder wing versions like No.17, with and without ailerons. One of the remark-able characteristics of this design is its rollahility on rudder. Developed to perfection on No.17, this model has as its claim to fame the ability to execute a rudder roll amazingly close to the best aileron roll.

In the development of the series, a significant new factor was taken into consideration. That's right, make the changes anticipated as desirable as possible for proportional control. The result, in our opinion, is an even better reed flier, and just what was wanted for proportional. The design, as presented here, is the proportional version, with but one slight change recommended for reeds.

It should be noted that this model is primarily a contest performer. It will, however, serve well as an intermediate trainer. The only reason we wouldn't recommend it as a basic trainer is simply because it is quite fast. Yet, it is so stable we get a lot of fun out of flying it with full up elevator, using throttle control to change altitude. The rudder remains very effective and the resulting ratio of this slow speed flying capability to its full-bore fast pace is greater than any model we have ever seen or flown. Therefore, it can be trimmed to fly slow for training, but since we are past that stage, let's proceed with the contest version.

Mac has developed some construc-tion techniques and design aspects that go hand-in-hand to produce an accurate model. That is, providing, of course, that good workmanship is exercised throughout! Herein lies one of the most important factors in building this or any other model. So, keep this in mind and you won't be dis-appointed in your version of the MAC SEVENTEEN. Now, since this is not a project for anyone without some model building experience, we will keep the construction details brief..."

Direct submission to Outerzone.

Note main model photo shows John Stare with his Mac 17, from VR/CS newsletter thanks to RFJ.

Supplementary file notes

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