Tham khảo tài liệu 'thiết kế kỹ thuật máy bay chiến đấu episode 3 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Cooua 11a tke Coc-Kpit . A founts Iu. bo Ok rd profile. must be SKetckeot witk Stick. 2 aUo rudd .r pedoj s o Fig. Preliminary plan view and inboard profile of light aeroplane in example 14. 5o i aches I metre LAYOUT Item. RectoM ular Ta ercJ VJiiAij oreo. ft sf aa f t Aspect ratio ShÀc ft stabiliser ojta ft1 spaa ft As feck ratio pin awX area f t1 Aileron area fp 15 34 -7-3 4-ẾS 2ÌỈ IO 15 12. 6 14 1 b b 7-4S 4 -71 II 12 b 14 7 o 546 THE DESIGN OF THE AEROPLANE of which swept surfaces and hinges are structurally longer and more complicated and costly to manufacture. The wing section has probably not been determined at this point but a depth of spar around 15 per cent chord with maximum depth at 30 per cent is reasonable. Tail surfaces have thickness ratios around 9 per cent. As far as choice of wing section is concerned do not waste too much time with theory and elaborate calculation of lift drag ratios. Almost any section which fits the requirements of gentle stall good c Lmax low drag low pitching moment and ample room for arranging wing spars is good enough for our kinds of machines. The rigging angle of incidence of the wing should be that for minimum drag of the section with standard roughness say 3 deg. Example 14 Use the results of examples 7 to 13 to sketch a single-engined light aeroplane with retractable gear and a 240 BHP 179 kW piston engine to carry 715 lb 325 kg payload. This is done in fig. . The aeroplane has a number of salient features blended with much guesswork. The cabin has been arranged to allow room for the wing structure to pass under the seats of the four occupants sitting side by side in tandem pairs. There is ample room for baggage behind the rear seats. From the firewall to the tailcone bulkhead is one structural unit with cutout for doors. Ideally there should be doors on both sides but crashworthiness considerations coupled with the need to save weight might limit us to one door. Cabin structure especially .
