Old Trusty (oz8639)

 

Old Trusty (oz8639) by Lawrence Reithmaier from Model Airplane News 1941 - plan thumbnail

About this Plan

Old Trusty(AKA Sport Trainer). Free flight gas parasol model. Original model was Brown Jr powered (.60 ign). Published Man Oct 1940. Redrawn here in September 1982, by Dick Gleason.

Quote: "How You Can Build and Fly One of the Most Sturdy and Reliable Gas Models. Old Trusty, by Lawrence Reithmaier.

THE main factors influencing gas model design are: stability, rate of climb, gliding angle and ruggedness; to which we may also add appearance or resemblance to full size aircraft. Since much time and money is expended in the construction of a gas model, each of these qualities should he included in any design considered for a future project.

Now let's see how the Sport Trainer measures up to our requirements. First of all, it does look like an airplane. Of course the cockpit may be a littic bit of date in this age of cabin ships equipped with heaters, overstuffed seats, and chrome-plated door handles, but it contributes a
great deal towards realism. Our ship also has a two-wheel landing gear (now who ever heard of a full size airplane with only one wheel?) and a fuselage shape which could belong to ffull scale plane.

If you were building models just for their appearance you would not be reading this article, so now we will discuss the more important qualities of the Sport Trainer: which, of course, are its flying characteristics. Although it was tested on a windy day, it flew perfectly on the first flight, needing only slight adjustment for circling. It has a very steep climb and a glide that would make any self-respecting, soarer green with envy.

The Sport Trainer also posesses the most important facts it to h e Ci sidurud in any airpla.ne desiw.n Stability. Stability is as important to a gas model as are wings, for without wings it will not fly, and without stability it may fly - but not for long. Spiral diving is the bugbo of gas models..."

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Supplementary file notes

Article pages, includes plan drawing pages as originally printed, 1941.

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Old Trusty (oz8639) by Lawrence Reithmaier from Model Airplane News 1941 - model pic

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