Baby Biwinger R/C Conversion
Top and bottom 1⁄32-inch sheet balsa skins (above left), 0.4 gram and 1.0 gram respectively. Completed empennage assembly (above center), 1.0 gram. Front view of fuselage sides (above right) and bulkheads assembled. Side view (below left) of fuselage sides and bulkheads assembled. Detail of 1⁄16-inch sheet balsa motor mounts (below center) for new front end of Baby Biwinger. Length was adjusted with motor assembly attached to provide suitable rough c.g.
location with empennage taped in place on fuselage. Mounts were then trimmed to fit. Wire landing gear installation attachment to forward edge of laminated front bulkhead. As can be seen in the photo the piano wire has been formed to follow the inside contour of the 1⁄32 sheet balsa fuselage skin. 30-minute epoxy used here for durability. Initial forming of nose section sheets (below right) for electric motor installation.
a 1⁄16-inch square or 1⁄16×1⁄8 balsa LE sanded round as part of the airfoil design. After thinking about this particular design char- acteristic for a while I realized that this was probably to prevent damage to the leading edge of the wing as much as anything else. F/F models tend to collide hard with the
first thing they encounter when at the fly- ing field—things like radio antennas on cars, field boxes, barbed wire fence, hedge apple trees, etc. So since you should be able to steer an R/C model to avoid such damage, this feature could well be eliminated in the interest of reduced drag and weight and in-
creased flight performance. The choice is yours.
4. Come up with a “serious” target weight and try to meet it.
5. As nice as it would be to have the ability to move the radio equipment from one plane to another, I have found that the lightest and
Initial mounting of empennage to fuselage (above left) and fitting of rudder and elevator pushrods. ParkZone Ember 2receiver (above center) mounted on the pair of 1⁄8 × 1⁄4-inch receiver mounts. Receiver and pushrod assemblies (above right) ready for installation into the fuselage. Bottom view of the
pushrods and receiver installed (below left) form the lower front of fuselage and are located for final positioning. Close up of forward cabin (below center) close out mounted to fuselage. Wings mounted to fuselage (below right) along with interplane struts.
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MAY 2013
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