Triple Threat (oz3696)

About this Plan

Triple Threat. RC stunt plane. Wingpsan 59 in.

Update 7/6/2022: Added article, thanks to Pit.

Quote: "Triple Threat. Outside loops and other advanced maneuvers are easy with an escapement airplane. All you need is a good aircraft like this one. Developed for testing the VariComps or cascaded escapement deals, does well on rudder. Multi possibilities.

Airplane designs truly qualified for rudder-only, cascaded escapements (Mickey Mouse), and multi-control can be counted on the thumbs of one hand. This one is outstanding as an all-purpose flier. Designed specifically for stunt on VariComp escapements - consecutive outsides and inside loops are easy, it maneuvers smoothly and easily on rudder and, with the addition of trim possible with multi-channel, would be capable of sustained inverted flight in addition to the outsides. On the VariComps, it demonstrated on 49 test flights (at time of writing) unusual possibilities as a basic, multi-class ship, assuming the necessary equipment substitutions.

Design: Good climb, moderate speed, relatively low dive speed, were required in a full-stunt machine of a size suited for escapements or servos. Five feet on a .19 is a reasonable maximum for an escapement airplane, yet is big enough for multi-channel and servos, with lightweight equipment. With heavy equipment and more than five channels, a larger aircraft would be required for top notch performance. But escapements can be marginal with big control surfaces and high air loads. Triple Threat has a 59-inch wing span with an 11 inch chord. A gross of less than four pounds gives 14 ounces wing loading and 326 ounces power loading.

Control System: Matched VariComps provide engine control through an SN escapement and Bramco throttle, on one quick blip; right rudder on one and hold, left on two and hold, up on three and hold, and down on four and hold. No timing problems occur with inch rubber escapement power with plenty of turns. Timing problems (wrong controls) exist when escapement speeds slow up - hence 3/18 inch rubber is advised against, or a low number of turns on any rubber. Engine control is really easy on lower escapement speeds, but then, fast signals for other controls frequently change engine speed. To save weight, 3/16 inch dowels were used at first with aerodynamically balanced elevators..."

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Article.

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