# Landing

From the market requirements, Vapp = 120 knots = 120 x 1.68781 = 202.5 ft/s (61.72 m/s). Landing CLmax = 2.1 at a 40-deg flap setting (from testing and CFD analysis). For sizing purposes, the engine is set to the idle rating, producing zero thrust using Equation 11.22.

In the FPS system, W/Sw = 0.311 x 0.002378 x 2.1 x (202.5)2 = 63.8 lb/ft2. In the SI system, W/Sw = 0.311 x 1.225 x 2.1 x (61.72)2 = 3,052 N/m2. Because the thrust is zero (i. e., idle rating) at landing, the W/Sw remains constant.

Performance. Chapter 13 verifies whether the design meets the aircraft perfor­mance specifications.

11.3 Coursework Exercises: Military Aircraft Design (AJT)

This extended section of the book on coursework exercises – military aircraft design (AJT) is found on the Web at www. cambridge. org/Kundu and includes the following subsections.

11.5.1 Takeoff – Military Aircraft

Table 11.4. AJT takeoff sizing

11.5.2 Initial Climb – Military Aircraft

Table 11.5. AJT climb sizing

11.5.3 Cruise – Military Aircraft

Table 11.6. AJT cruise sizing

11.5.4 Landing – Military Aircraft

11.4 Sizing Analysis: Civil Aircraft (Bizjet)