By Rene J. Francillon, Peter B. Lewis

A whole examine the lifetime of the B-52's. Photo's on evry web page.

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Extra info for B-52: Aging BUFFs, Youthful Crews (Osprey Colour Series)

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Roll Roll angle sensor Following sea - 1 0 7 . roll "•Beam sea 1 f Hydraulic relay Unit J Roll velocity sensor 11 Fin FIG. 4. Principles of continuous control. I D Time (sec) (a) ho'/ Time (sec) Control signal5Roll v e l o c i t y ^ ^ , ^ ^ 4-637. roll FIG. 5. (a) Beam sea control, / (b) (b) Following sea control. TYPES OF STABILIZATION IN TILTING. FIN SYSTEMS 51 The graphical illustration of the combination is shown in Fig. 5. The combined curve acts as the control signal for the fin mechanism and possesses a phase advance to the velocity signal.

Its function is to select, add and amplify the various signals and to compute an order for: (c) The operational unit. This unit carries the order out by means of pumps and a fin tilting mechanism. A block diagram is shown in Fig. 1. BASICALLY Roll angle 1 Roll | vel. List correct. 1 Damping || m ( \[1 servo 9 " Rate =fiN*-Tpir>—® ψ£^~Λ. Mech. feedback ■ èrj^H"^ Control unit I Roll 1 accel. Sensor unit — . . A M CX CT Electrical linkage Mechanical linkage Servoamplifier Servo motor Synchro transmitter Synchro receiver (Control transformer) FIG.

2. Note that the tank is above the centre of gravity so that the statical moment due to the difference in water level in the vertical legs is acting in the same direction as the moment caused by the dynamic force which is created by the acceleration of the water in the horizontal connection. ANTI-ROLLING DEVICES IN GENERAL 33 Air valve FIG. 2. Anti-rolling tank. T h e action of anti-rolling tanks is shown in Fig. 3. T h e phase difference between the movement of the water and the movement of the vessel is 90°.

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