Triple Threat (oz7336)
About this Plan
Triple Threat. Multi-purpose design for three different types of flying: FF power, PAAload and Wakefield rubber. The same wing and stab are re-used on three different fuselages.
Quote: "Triple threat is my answer to the biggest problem that faces most model builders: time. The basic model is the Wakefield, with the same wing and stab for the gas models. This simplifies packing and transportation problems, and also cuts building time. All models conform to the AMA contest rules for 1955 and 1956.
Design is fairly conventional, with minor changes from my 1954 designs. Five years of contest flying have raughr me that the most important feature of any model is con-sistency, I feel that any aerodynamic feature chat detracts from this is not worth while. Efficiency comes an the expense of stability; thus, the ultimate design will be quite tricky to fly. The value of streaming has yet to be proven at model Reynolds Numbers, and it makes for difficulty in building and repair. I think that clean functional lines, with careful alingment of all surfaces, are more than adequate for contest models. Good stable mounting platforms are more important than a slight reduction in frontal area.
Aerodynamic features are the long tail moment arms, which improve stability and glide performance. Wing and stab are medium-high aspect ratio; the stab is 38 per cent of the wing area. The moderately high dihedral with a high wing location assures a good spiral stability. CG position is fairly far back, but with 2 degrees incidence, longitudinal stability is adequate. Fixing the fin permanenrly to the fuselage helps keep adjustments and makes packing easier. All models feature a sturdy foolproof landing gear, which minimizes the ROG problem. Airfoils are modified NACA 6410 and 9 per cent Clark Y. This combination has always given good results when used with sheeted landing edges.
Construcrton is straightforward, if slightly unconventional. The full geodetic structure on the wing and stab is definitely warp-proof, and well worth the additional building time. Sheet balsa fuselages have been my weakness for four years, and I find more to recommend them each year. It can be built as lightly as the built-up type, and is much stronger and easier ro handle..."
Lee Renaud's Triple Threat from Model Airplane News magazine issue 06-55.
Direct submission to Outerzone.
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