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Tham khảo tài liệu 'thiết kế kỹ thuật máy bay chiến đấu episode 2 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 270 THE DESIGN OF THE AEROPLANE get into and out of small fields. The same applies to fields that are hot and high with reduced density altitudes. There is a direct trade-off between w s and ambient density p for a given Vso which may be seen from eq 6-68 . Low span loading w b reduces induced drag which improves rate of climb. Therefore if we want an aeroplane to climb fast make the wingspan as long as possible for a given structure weight . For high speed profile and parasite drag must be reduced which means that fast aeroplanes need small frontal wetted and wing areas. But small wing area spoils field performance forcing one to provide flaps and other forms of variable geometry. Having made this last point it should be noted that many amateur-built light aeroplane designers do not bother to equip their aircraft with flaps. The trim changes which occur and the added mechanical complexity and weight are thought to outweigh any advantage in reducing a landing speed of 50 to 60 knots by around 5 knots. It is argued that the kinetic energy at such relatively low speeds can be dissipated more cost effectively by a combination of tail-down attitude after touchdown and wheelbrakes. Now that we have some idea of the airframe factors which influence achieved performance we shall look next at powerplant characteristics. References 6.1 Mondey D. 1975 The Schneider Trophy. London Robert Hale. 6.2 Quickie Aircraft Corporation Quickie. Post Office Box 786 Mojave Ca 93501. 6.3 Foxworth T. G. 1975 The Speed Seekers. London Macdonald and Jane s Publishers Ltd. 6.4 Federal Aviation Regulations Part 23. Federal Aviation Administration Superintendent of Documents US Government Printing Office. 6.5 Macdonald and Jane s Publishers Ltd annually Jane s All the World s Aircraft. London. 6.6 Light Aeroplane Design Competition Guidelines 1978-79 . The Royal Aeronautical Society. 6.7 Air Navigation Order Section 101.22 1967 Australian Department of Civil Aviation. 6.8 Special Terms of .
