Barracuda - Twin-hull flying boat model, for free flight or radio control.
Quote: "The Barracuda design was inspired in part by a flight of ancient Italian flying boats which visited the US in the early 1930s. While it only vaguely resembles the basic planform, it does add up to an interesting and off-beat model aircraft design, and quite practical for model flying. The twin hulls give excellent water stability at all times, plane well for take-offs, and are easy to build. The wing is of simple construction, as is the stab. Rudders are boom mounted, and the general aircraft is the minimum required for the tasks at hand.
The engine is mounted in a circular nacelle, well braced to the wing, and ample in size for the aircraft. Displacements of .29 through .45 are suitable but extreme. A .35 is a better choice for free-flight ROW, while .35 to .45 mills may be used for R/C work, de-pending on the weight of equipment carried. Try smaller engines first, shifting to increased displacement en-gines as the need arises. Even a .19 would keep the aircraft airborne by hand-launch, so all you might loose is a water take-off with an under-sized engine. Better that than being initially over-powered for testing.
The general planform is easy to build, light, strong and a good depend-able flier in the air. It can handle the power, and tends to trim out easily, free-flight or with radio. It is advisable to keep weight down as much as possible, for the smaller displacements. If more than single channel R/C is in-stalled, it will require more thrust to reach take-off speed as mentioned.
Construction: Start with the wing, laying out all panels over a plan. The working surface must be flat. and all wing edges, spar stock etc. should be true. Select good quality wood throughout, medium grade sheet for the ribs, and pre-coat all end grain for a good cement joint. This is important on seaplanes. Gusset all panels, and add sheeting as indicated. Trim and sand to the desired airfoil..."
Barracuda, Flying Models, August/September 1965.
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