tailieunhanh - Aeronautical Engineer Data Book Episode 8

Tham khảo tài liệu 'aeronautical engineer data book episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Principles of propulsion 131 VTOL fighter subsonic 1 X 22 000 Ibf kN turbofan Military fighter supersonic 2 X 25 000 lbf kN reheat turbofan Launch vehicle solid rocket boosters 2 X 2 700 000 lbf 12 MN Fig. Aircraft comparative power outputs Section 9 Aircraft performance Aircraft roles and operational profile Civil aircraft tend to be classified mainly by range. The way in which a civil aircraft operates is termed its operational profile. In the military field a more commonly used term is mission profile. Figure shows a typical example and Table some commonly used terms. Relevant formula Relevant formulae used during the various stages of the operational profile are Take-off ground roll Sg 1 2g A .ln T O K . This is derived from I ịa dV2 J0 Total take-off distance Sto SG Fpi where Fp1 is a take-off plane form coefficient between about and . VTRANS VLOF V2 2 Rate of climb For small angles the rate of climb RC can be determined from F - D V RC 4 7 g dh where V g. dV dh is the correction term for flight acceleration Aircraft performance 133 Stepped cruise Transition to climb Taxi out and take-off to 1500 ft Climb _Range Mission time and fuel Block time and fuel Descent Landing from 1500 ft and taxi in Fig. A typical operational profile Table Operational profile terms Take off Take-off run available operational length of the runway. Take-off distance available length of runway including stopway clear area at the end and clearway distance from end of stopway to the nearest 35 ft high obstruction . Vs. aircraft stall speed in take-off configuration. VR. rotate speed. V2 take-off climb speed at 35 ft clearance height. Vmc minimum speed for safe control. VLOF Lift off speed speed as aircraft clears the ground. Transition to climb VTRANS average speed during the acceleration from VLOF to V2. Ỵ. final climb gradient. Take-off climb best climb angle. 1st segment. first part of climb with undercarriage still .