Large tropospheric aircraft operated by Alfred Wegener Institute, Germany. POLAR 5 is a Basler BT-67 type aircraft, a fixed-wing aircraft produced by Basler Turbo Conversions of Oshkosh, Wisconsin. It is built on a retrofitted Douglas DC-3 airframe, with modifications designed to improve the DC-3's serviceable lifetime. The conversion includes fitting the airframe with Pratt & Whitney Canada PT6A-67R turboprop engines, lengthening the fuselage, strengthening the airframe, upgrading the avionics, and making modifications to the wings' leading edge and wing tip. This aricraft is part of the EUFAR TA fleet.
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More Information (under review)
Dimensions: Length: 20.66 m; Height: 5.20 m; Wingspan: 29.00 m; Flying performances: Speed: Min speed: 50 m/s Max speed: 105 m/s Usual speed during measurements: 80 m/s Usual speed during transit flights: 100 m/s Altitude: (1 ft = 0.31 m) Min altitude: Above sea: 100 ft Above ground: 500 ft Max ceiling: 19000 ft Usual ceiling during measurements: 14000 ft Payload: Empty weight: 8437 kg Max take-off weight: 13068 kg Max payload: 4631 kg Max scientific payload: 2500 kg ... (X-coordinate of 2nd point) Usual scientific payload during measurements: 500 kg Scientific payload for max endurance: 100 kg ... (X-coordinate of 1st point) Endurance: Max endurance: 8 h (at min scientific payload and max fuel) (Y-coordinate of 1st point) Endurance at max scientific payload: 3 h ... (Y-coordinate of 2nd point) Range: Max range: 1900 km (at min scientific payload and max fuel) Conditions for max range: with skis, 45' reserve, 3 PoB, survival equipment for 3 Range at max scientific payload: 470 km Usual range during measurement flight: 1675 km Other: Take-off runway length: 1200 m Engines: Pratt & Whitney PT6A-67R; Avionics: Honeywell Lasernav V Crew and scientists on board: Crew (pilots + operators): 2 pilots, (1 mechanic); Seats available for scientists: 5 Cabin: Length: 12.85 Width: 2.34 Height: 2.00 Apertures: top: 3 x 0,50 m & 5 x 0.15 m (all round) bottom: 4 x 0.45 x 0.50 m & 0.18 x 0.18 m (all rectangular); 2 x 0.15 m (round) ; Cabin pressurized: unpressurized More information: drop sonde launcher available; Aircraft modifications: Nose boom: 3 m protruding, with 2 sensor heads (magnetics, meteorology) Windows: 2 bubble side windows 1 optical window Openings: top: 3 x 0,50 m & 5 x 0.15 m (all round) bottom: 4 x 0.45x.50 m & 0.18x0.18 m (all rectangular); 2 x 0.15 m (round) Hard points: 3 hard points each side underneath the wing, inner and center 150 kg each, outer station 30 kg, mouting system bolts, resp. NATO lock system Inlets: no fixed ones, 2 removable inlets in front for aerosol and gases, 2 removable outlets in the back Additionnal systems: tail boom for magnetics and spectrometer Acquisition systems: MEDUSA-P Electrical power: Aircraft total electrical power (kW): 22.4 Electrical power (kW) and voltages (V) available for scientists: 15.4 kW/28 V DC, up to 2 kW 115 VAC/400 hZ and up to 2 kW 220 VAc/50 Hz - AC inverter are fed by DC science power -> less DC power when using AC power
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