Beam Bender (oz11301)
About this Plan
Beam Bender. Radio control ultra-light model for Cox TD engine.
Note the Roof Raiser (oz11300) and Beam Bender both appeared in the same article in RCME, June 1995.
Quote: "There is only one basic difference between the structure of the wings for the monoplane and biplane. The former, because of a larger span and being unsupported, has capping strips to the rear of the ribs to stiffen the complete wing panel. The 'Beam Bender' biplane, with the added strut arrangement, does not require this and so the ribs are cut to full aerofoil at the rear. With the sheet spar and 1/32 sheeting forming a 'D' box, the wing structure is amazingly rigid.
Back to basics: The fuselage is a basic box structure. You could cut a few holes in the rear end sheeting but you might then have to add ballast to the tail for a correct balance (this is not an excuse to use 'heavy balsawood' for the tail surfaces). There is room for two micro servos, side by side, in the fuselage if you wish to fit throttle control and in the 'Beam Bender' there is sufficient internal fuselage height to fit mini servos.
The tailplane tip fins are not there simply as ornaments or for aerodynamic reasons. They, together with the sheet inserts, help to prevent the tailplane from warping. It might be interesting to try a similar tip on the fin (an arrow shape on plan view), although I haven't encountered problems with warping of the fin..."
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