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airplane design 5 - component weight estimation - part 5

Phần 1: Bối cảnh Công nghiệp • Hệ thống sân bay Mỹ • Sân bay Cải thiện tài trợ Sân bay hệ thống Hoa Kỳ • Sân bay thương mại được sử dụng cho . • Du lịch Kinh doanh và Du lịch • hàng hóa • Một số phi công tư nhân | The factor Kịnl takes on the following values K. 1.25 for airplanes with inlets in or on the fuselage for a buried engine installation Kịnj 1.0 for inlets located elsewhere Definition of new term qD design dive dynamic pressure in psf 5.3.2.2 Torenbeek Method The following equation applies to transport airplanes and to business jets with design dive speeds above 250 kts. wf 0.021Kf VDlh wf hf 1 2 Sfgs 1 2 5.27 The constant Kf takes on the following values Kf 1.08 for a pressurized fuselage 1.07 for a main gear attached to the fuselage. 1.10 for a cargo airplane with a cargo floor These effects are multiplicative for airplanes equipped with all of the above. Definition of new terms Vp design dive speed in KEAS Ijj distance from wing c 4 to hor. tall ch 4 in ft 2 Sfgs fuselage gross shell area In ft 5.3.3 Military Patrol Bomb and Transport Airplanes 5.3.3.1 GD Method For USAF airplanes Eqn. 5.2ố may be used. For USN airplanes the following equation should be used wf 5.28 11.03 K.nl 1 23 q 100 0 245 W_ n 1000 0 9 8 lf hf 0 61 ini L TO Part V Chapter 5 Page 77 Values for Kinỉ are as given in 5.3.2.1. Pef initioa.Qf_n w_t inu. qL - design dive dynamic pressure in psf 5.3.4 Fighter and Attack Airplanes For estimation of fuselage weights Equations 5.26 or 5.28 may be used. Warning In using Eqn. 5.26 for fighters leave off the factor 2 at the beginning of the equation. 5.4 NACELLE WEIGHT ESTIMATION The nacelle weight is assumed to consist of the following components 1. For podded engines the structural weight associated with the engine external ducts and or cowls. Any pylon weight is included. 2. For propeller driven airplanes the structural weight associated with the engine external ducts and or cowls plus the weight due to the engine mounting trusses. 3. For buried engines the structural weight associated with special cowling and or ducting provisions other than the inlet duct which is included in the air induction system under powerplant weight. Section 6.2 and any .