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Aviation History
1974
1974 - 0039.PDF
FLIGHT International, 10 January 1974 35 lock switch is connected in series with the speedbrake selector and the flap lever. When DLC is in operation it is necessary to reduce to a minimum changes to the established stalling characteristics of the One-Eleven. The DLC and pitch compensation demand signals are therefore automatically cancelled and the SEP 5 autopilot dis connected after the stick-shaker has been in action for about 2 sees. Since the maximum lift coefficient of the wing is reduced when the spoilers are selected, approach speeds with DLC are increased by 2kt to 3kt to main tain a satisfactory margin above the stalling speed. The importance of the location of the point at which direct lift acts relative to the centre of gravity, the aerodynamic centre and the man oeuvre point has been emphasised in all the work carried out by the RAE. DLC cannot be treated simply as a device for applying lift without any regard to the aerodynamics and stability of the aircraft. The distance of the aerodynamic centre of control lift from the aerodynamic centre of the aircraft affects the control and re sponse of the system. If this centre of control lift is ahead of the centre of gravity by an .amount equal to the manoeuvre margin, lift increases in proportion to control application and the aircraft does not otherwise re spond to the control input. The most efficient range for direct lift to act is forward of this point and therefore, in general, reasonably forward of the centre of gravity of the aircraft. In this case, the direct action of the applied lift is further amplified by a favourable response in aircraft incidence. Theoretical and experimental work on automatic control with DLC was carried out prior to the flight of the modified One-Eleven to study the per formance of the aircraft in turbulence during approach and landing. Two ex perimental automatic landing systems for the BLEU One-Eleven were de signed, the first using automatic throttle and elevator control and the second using spoilers for DLC. The control laws for each system could be simulated in the aircraft by means of the RAE's "versatile autopilot." Comparisons have been made be tween the predicted performance in turbulence of the two experimental systems and simulations of current automatic landing systems. In the ex perimental system using DLC, the spoilers were fed with the same verti cal motion command signals as was applied to the elevator, apart from a suitable gain change. The evidence available from the tests suggests that the use of spoilers provides a marked improvement to the performance in turbulence compared with a system using elevator and throttle control only. The results also suggest that the largest touchdown deviations are pro duced by gusts occurring close to the ground and that further work on this subject should concentrate on this aspect. Although the 1973 sales of Mes- serschmitt-Bolkow-BIohm (8000 Mu nich 80, Postfach 8011220) increased by only DM40 million to some DM1,190 million relative to (1972, the operating loss of DM6 million in 1972 was not repeated. The company expects to declare a dividend in 1974 and subse quent years and to reach sales of DM2,000 million in (1978 as develop ment programmes move into the pro duction stage. MBB's space work generates im portant sales, but MRCA and, hope fully, Airbus are the chief prospects in increasing turnover. The B6105 heli copter is selling well and German military orders for 300 might materia lise in -1974. There is increasing in terest in the Kabinen Taxi urban monorail system. EMI Electronics (Blyth Rd, Hayes, Middx) has introduced a new video map generator, the VM 101, designed for use with ATC or harbour radars and radar simulators. Static informa tion such as airway boundaries is drawn on a slide, which is inserted in the equipment and scanned by a flying spot. The result is amplified and added to the video signal input to the radar display. Standard photographic plates or 35mm film transparencies can be used. When used with simula tors the equipment can display clouds which are electronically made to drift with wind. A new family of thin line pressure transducers for use on aerofoils and turbine blades has been introduced by Kulite Semiconductor Products (1039 Hoyt Ave, Ridgefield, NJ 07657). The LQ-5-080 or LQ-26-125 series are less than 0-015in thick, have diameters of from 0-080in to 0 125in and are avail able with pressure ranges of 0-101b/ sq in and 0-5001b/sq in; nominal out put is 75mV. Transducers of this type are claimed to have experienced 33,000g lateral accelerations, without failure, when used on compressor blades. RCA's Aviation Equipment Depart ment (8500 Balboa Boulevard, Van Nuys, Calif 91409) has redesigned its AVQ-47 weather radar for light and medium twins, increasing the range from 80 n.m. to 125 n.m. The new equipment will be available in March. Who's selling what RCA's Aviation Equipment Department (Van Nuys, Calif) has sold AVQ-47 weather radars worth $348,000 to Cessna, for installation in 400-Series aircraft, and $75,000-worth of the same type to Embraer, which will equip the EMB-110 Bandeirante. BCA has also received orders from Dornier for AVQ-47 s and also for AVC-110A VHF transceivers, AVN-220A VHP integrated navigation systems and AVQ-75 DMEs. This equipment will be installed in four Skyservants for the Nigerian Air Force. Mitsubishi Heavy Industries (Nagoya, Japan) and the Kawasaki Aircraft Protect Division (Kobe) are to build flaps for the Boeing 747SP. Electronic Communications (St Peters burg, Fla) has won a Boeing contract worth $1 million to build the Awacs flight-deck digital radio control. Kaman Aerospace (Bloomfield, Conn) has received an $860,000 contract from Fairchild Republic to build tooling for aft-fuselage sections of the A-10. Kaman will also supply detailed sheet- metal components for the first six pre- production aircraft. People and posts Mr Anthony D. Autorino has been appointed a senior vice-president of Hamilton Standard and Mr John Lovkay, Jr, is named manager of the Electronic Systems Department. Air Chief Marshal Sir Denis Spotswood is to join the board of Rolls-Royce (1971) as vice-chairman after his retirement as Chief of the Air Staff on March 31. Marshal of the Royal Air Force Lord Elworthy retires from the board at the same time. Three other executives have been ap pointed: Mr Dennis Head becomes managing director of the Derby Engine Division, Mr D. J. Pepper is the new company executive office director and Mr R. T. Whitfield be comes managing director of the Bristol Engine Division.
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