Designer: Günter Rochelt Lerchenfeld 2 D-22081 Hamburg Germany Plane: Solar Plane Solair II Dimensions/Systems/Weights Wing Planform: rectangular swept forward (inner) and backward (outer) Airfoil: DU 95-136+8 Span: 20.00 m Area: 17.00 m² Aspect ratio: 23.5 Mean chord: 855 mm Aileron area: 2.87 m² Aileron mean width: 160 mm Aileron deflection: +15° / -25° Spoilers: 6000 x 70 mm (inner panel only) Remarks: Ailerons being used as full span flap Stabilizer Stab arrangement: V Tail Open angle: 110° Planform: tapered Airfoil: NACA 0012 mod. Stab area: 2.04 m² Control surface area: 0.57 m² Control surface mean width: 168 mm Control surface deflection: 15° elevator plus 15° rudder; max. 30° in combination Projected vertical area: 1.97 m² (incl. fuse extension) Projected horizontal area: 1.17 m² (incl. fuse extension) Fuselage Length: 6.12 m Height (at cockpit): 0.9 m w/o landing gear Width (at cockpit): 0.62 m Landing gear: steerable front wheel, fixed 2 wheel main gear, fixed tail wheel Stab lever length: 3.80 m Solar Generator Type of solar cells: Monocrystalline Silicone Max. efficiency: : 17.3 % Solar cell area: 13.44 m² Max. power: 1163 W (insolation 500 W/m²) Control Type: PCE Optimiser Max. efficiency of MPP Tracker: 98% Propulsion Motor type: Permanent induced DC motor Number of motors: 2 Motor arrangement: Pusher, mounted at the stabilizer fin tips Nominal voltage: 30 V each (motors are wired in series) There are 2 propulsion alternatives: Type 1 (direct drive) Motor designation: DINO HP 550-100 Max. power: 2 x 4500 W Max. efficiency: 91 % Propeller type: Delago 2 blade folder Propeller diameter: 1.46 m Propeller max. efficiency: 89 % Type 2 (geared drive) Motor designation: DINO HP 550-67 modified Max. power: 2 x 4000 W Max. efficiency: 91 % Gearbox type: planetary Gearbox ratio: 1:4.32 Propeller-Typ: Delago 2 blade variable pitch folder Propeller diameter: 2.00 m Propeller max. efficiency: 92 % Remarks: inflight thrust monitoring Batteries Batteriy type: SANYO KR 4000; 54 cells wired in series 2-4 packs in parallel Nominal voltage: 65 V Capacity: max. 4 x 5.2 Ah = 20.8 Ah Stored energy: max. 1352 Wh Weights Empty weight: 140 kg Max. weight (MTOW): 230 kg Max. wing loading: 13.5 kg/m² Construction Carbon/Glass/Aramide Composite Honeycomb sandwich shell construction Design constraints Design rules: Berblinger Bauvorschrift Max load n1: 4.0 Max. load n2: 4.0 Max. load n3: -1.5 Max. load n4: -2.0 Operational velocities: Stall speed vs: 44 km/h Maneuver speed vA: 96 km/h Max. speed vNE: 120 km/h Operational top speed vD: 111 km/h Performance Glide: Min. sink rate: 0.35 m/s at 51 km/h Best glide Emax: 46 at 59 km/h Level flight with solar power (500 W/m²) Min. aerodyn. power: 755 W Optimum level flight airspeedt: 51 km/h Climbing with battery power: Aerodynamic power req'd for 2 m/s climb rate: Min. aerodyn. power: 5071 W at 51 km/h Aerodynamic power req'd for 2 m/s climb rate and optimum: matching of the propulsion system: Aerodynamic power: 5742 W Optimum climb airspeed: 65 km/h