Consider the simplified speedbrake configuration slightly resembling the F100 sp

Question

Consider the simplified speedbrake configuration slightly resembling the F100 speedbrakes. For further analysis we will only look at one side, the upper halve, of the system. Coordinates in meters: A: (0,0) B: (0.10, -0.08) C: (0.26, -0.08) D: (-0.04, -0.13) E: (0.17,-0.07) F: (0.50,-0.14) Mass of speedbrake outer fuselage component (member ACF, e.g. location C): 25 kg Mass of speedbrake inner fuselage component (member BEC, e.g. location E): 25 kg System description: Actuator EB is able to extend with a constant speed dr_2/dt. There is no friction in the system. The aircraft travels with a velocity of 60 m/s through an air density of rho = 1.23 kg/m^3. The surface area of the speedbrake is 0.26 m^2 and the Cd is for theta_1 = 0 degree is 0 and for theta_1 = 60 degree is 0.4 (assume a linear relationship). [J. Roskam, (2003), Airplane Flight dynamics and automatic flight controls part II, DAR cooperation] One of the assumptions is that the speedbrake can be extended with 2 degree/s. Extension is defined as a 60 degree rotation of the speedbrake, theta_1. What extension speed dr_2/dt is required (actuator DB). Using vector notation express V_B with respect to point A. Using vector notation express V_B with respect to point D. Since equal in both cases, write down the full equation: V_B/A = V_B/C Solve for omega_1 and omega_2.

Explanation / Answer

Student,

What is the meaning of (member ACF,c.g.location C) and (member BEC, c.g. location E).

Actually mass is given 25 Kg. Its ok, but these two brackets are given along with the mass so I just want to ask that, Are these two brackets wrongly given here ?

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