1985 On March 2 1, the British government announced that Short Brothers won the bid, thus ending the two-year bidding. The main consideration of the British government in making this decision is cost. According to the contract, the Short Brothers will manufacture the first batch of 130 toucans for the Royal Air Force. The delivery is scheduled to start at the beginning of 1987, and 12 will join the active service at the end of the same year.
Compared with EMB-3 12 intermediate trainer made in Brazil, the main improvement projects include: adopting engines with higher thrust; Install the abdominal speed brake; Increase structural strength; Adopt a new cockpit layout; A large number of British equipment are selected. The design fatigue life of the short-brother toucan is 12000 hours.
The first toucan with Garrett PP-ZTC engine made its first test flight in Brazil at 5438+0986 on February 6th. After completing the flight test in Brazil for about 6 hours, it was disassembled and transported to Britain, and then reassembled in Belfast. A series of flight tests have been carried out in Britain since1April 1986 1 1.
The wing of S-3 12 is a cantilever lower wing, and the installation angles are13 ′, 7075-t7351,2024-t-351/extruded profile. The aileron is equipped with an electric adjusting piece and a small ground correcting piece.
The fuselage adopts the conventional semi-hard shell structure of aluminum alloy, and the abdomen has a hydraulic drive speed brake. The tail is the same as EMB-3 12 made in Brazil.
Landing gear is a three-point landing gear before hydraulic retraction, which can be lowered by accumulator in case of emergency. Fairey Hydraulic Equipment Company's nose landing gear. Deng Lupu Rubber Company's wheels and tires have a main wheel size of 22×6.75- 10 and a front wheel size of 5.00-5. The main wheel is equipped with a single disc hydraulic brake of Deng Lupu Rubber Company.
The power plant adopts the TPE33 1- 12B turboprop engine with the power of 820kW from garrett Company to drive the constant-speed propeller with the fairing from Hartzel Company. Two interconnected fuel tanks are installed on each wing, carrying 694 liters of oil. There is a gravity filler on the upper surface of the wing, and the oil flow is 4.25 liters. An auxiliary fuel tank can be temporarily installed under the wing with a total capacity of 660 liters. Allow the fuel system to fly backwards.
The cockpit is two seats in front of each other, and the back seat is higher. It is equipped with Martin-Baker MK8LCP ejection seat.
The S-3 12 cockpit is equipped with an air conditioning-steam circulation system, and the discharged air is used for heating and defogging the canopy. A hydraulic system with a pressure of 207×105pa (211kg/cm2) is used to retract the landing gear and speed brake. Direct current is provided by a 28 volt 200 amp starter/generator and two 24 amp hour alkaline battery packs. The static converter provides 400 Hz 1 15 volts and 26 volts AC. Each ejection seat is equipped with an independent high-pressure oxygen cylinder, which can supply oxygen for 15 minutes. The air inlet of the engine is deflated by the engine to prevent icing; Propeller, pitot tube, static pressure hole and stall alarm system are all electrically heated to prevent icing.
Standard avionics include VHF/UHF/audio communication systems; Gyro magnetic compass, VHF omni-directional beacon/instrument landing system/beacon receiver, General Electric company AD2780 TACAN, Kyle company transponder.
S-3 12 wingspan 1 1.28m, captain 9.86m, wing area 19.40m2: propeller diameter 2.39m; Empty weight is 20 17kg, maximum internal oil load is 555kg, maximum takeoff weight is 2650kg, maximum wing loading1.34kn/m2 (137.1kg/m2), and maximum dynamic load is 3.23kg/kw.
The speed limit is 5 18km/h, the maximum horizontal cruising speed (height 3050 ~ 4570m) is 507km/h, the economic cruising speed (height 6100m) is 407km/h, the stall speed 128km/h, and the maximum climbing rate (sea level