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The SD-2 SportMaster is two seat high performance light airplane in the side by side order. It is designed in accordance with the LTF-UL/UL-2 regulations but could also be operated as LSA or Experimental airplane. The main emphasize is given on high performance + payload + comfort at lowest possible price.
The fuselage is of wood truss design with prevalent section 15×15 mm covered with plywood of 1.5-3 mm thickness. The pilot seat back is inclined under 40°. Both seats are equipped with in flight adjustable pedals with 150 mm range. These assure comfort also for 200 cm (6.6 ft) tall pilot. The inside width of cockpit in shoulder place is 117 cm (46″). The plywood tunnel with wing and upper gear legs mounts is under pilot knees. The baggage compartment of 190 l (6.7 cb ft) volume and 20 kg/44 lbs capacity is behind seats
Two half wing uses GA 37U-A315 airfoil. It consists of full carbon composite main spar on which are glued ribs made of XPS. The composite integral fuel tank of is glued on the main spar. The rest is covered with 1.5 mm plywood. Wingtips are made of glass/PVC foam sandwich. Big slotted flap is made of carbon/PVC foam sandwich. The staticaly counterbalanced ailerons are of plywood/XPS foam construction. Connection of wings to fuselage is performed thru two main and two auxiliary pins. Disassembly of wings from fuselage takes 10 min and assembly 15 minutes.
The all movable horizontal tail (HT) has electrically actuated anti-servo/trim tab and is statically balanced. Tails are of similar construction as wings- on composite spar are attached polystyrene ribs and plywood skin. Disassembly of HT is made thru disconnection of control and tab rods and pulling out of pin. The fin has main composite spar with carbon caps and HT hinge.
The tricycle undercarriage has controllable nose gear of 300 mm DIA. The main wheels of 350 mm DIA are mounted on cantilever glass composite legs. Hydraulic brakes are actuated by lever on the middle console.
The horizontal tail and ailerons are controlled via pushrods and bell cranks. The rudder is controlled via cables. Flaps are actuated mechanically via lever on middle console.
It is possible to use any engine of 65-120 HP power range up to 110 kg (243 lbs) weight. The R 912 ULS2 engine is used in prototype.