DuoBanjo - Design Description
is based on the SM701 airfoil; trapezoidal outer part is modified into FX-60-126. Wingtips are equipped with winglets. Basic element of the construction is a plywood, box section beam and ribs made from spruce scantlings. Front part of the ribs is made from expanded polystyrene. Leading edge of the wing is covered by plywood and forms a torsion box. Polyester fabric covers trailing part of the wing. On the upper part of the wing are located extending, rod actuated aerodynamic brakes. Hybrid construction ailerons (fiberglass-wood-plywood) are also covered by a polyester fabric. They are operated via Dural tube rods. Wings are supported by shaped struts. Wing is fixed to the fuselage by mountings located on the wing beam and on the trailing edge section.
are "T" shaped. Horizontal tail surfaces have similar construction as the wing and use modified Wortman FX-71-L-150/30 airfoil.
(closed type) is covered by a one-piece canopy. There are two ventilation windows on the side of the canopy. The plane is equipped with dual set of controls, however lifting/retracting of the power unit can be controlled only from the front seat. Control sticks are classic style type. Seats are equipped with 4-point safety belts. The cockpit is ventilated via air outlets, located on the instrument panel.
Fuselage, including the tail fin, is formed from a fiberglass monocoque. Monocoque is reinforced by plywood ribs. Ribs are utilized as structure elements for wings, struts, undercarriage wheel, rescue system and power unit mountings.
consists of the two main unsprung wheels (outer radius 400mm) and controllable tail wheel (outer radius 140mm). The main wheels are fitted with disk brakes. The brakes are operated via a cycle brake levers, mounted on the control stick.
Controls and instrumentation.
The plane is equipped with one instrument panel, containing following instruments: airspeed indicator, altimeter, variometer, RPM gauge, fuel gauge, engine temperature gauge, compass and bank indicator. Power unit management panel is located on the right side of the cockpit. Instrumentation can be customized according to customer's requirements.
System of controls.
Ailerons, elevator and aerodynamic brakes are operated via rods, equipped with swiveling joint ends. Levers are fitted with the ball bearings. Rudder is cable controlled, rudder pedals also control steerable tail wheel.
The main source of the energy is an on-board accumulator 12V-14Ah, which is recharged by the engine. The accu feeds the lifting/retracting system of the power unit together with bay doors and electric starter.
Alu fuel tank is located in the fuselage and it can contain 27 liters of the fuel. It is equipped with fuel float system, measuring quantity of the fuel in the tank. Filler neck is located on the left side of the fuselage, below the wing.
is based on the Rotax 447 engine, equipped with electric starter and special belt reducer. Propeller can be lifted to the operational position or retracted back to the fuselage during the flight.