High Tension (oz9527)

About this Plan

High Tension. Single channel sport model for 049 power.

Quote: "A high degree of manoeuvrability, combined with an attractive, out-of-the-rut appearance, was what I was aiming for when I dreamed up High Tension in the summer of 1967.

I believe it has lived up to expectations. The name - initially given because of the model’s pylon-racer appearance - seems particularly apt in terms of its flying performance, too. To achieve manoeuvrability a rather rearward CG is used, plus deBolt type rigging. That is to say, 5° wing incidence and 3-1/2° tailplane incidence. The wing has only 4° dihedral, for grooviness - and a tapered wing for its tip stalling characteristics.

The other main point of design is the underfin, which allows the use of a full depth rudder. That is to say, a good proportion of the rudder is below the centre line of the fuselage. It should be understood that a rudder mounted above the fuselage centre-line, whilst producing a turn in the desired direction, also induces a rolling action in the opposite direction.

High Tension will only fly properly when adequately powered, so use a good powerful motor. A Cox Tee Dee .049 is used in the original and is highly recommended. Do not imagine that for first flights something with less 'poke' will suffice - it won’t. This is not a beginners’ model, as I said, and simply underpowering a high-performance job will never turn it into such. In fact, under-powering can be more dangerous than seemingly overpowering.

Construction: All the wing ribs are first cut to the root rib size (to be tapered down to actual size later). Next cut 1/16 in sheet to the outline of the wings, for the lower surface, less tip blocks..."

Supplementary file notes

Article pages (OCR text, from S&T).

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