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Strike Back: Legacy (DVD): Tim McInnerney, Michelle Yeoh, Sullivan Stapleton, Milauna Jackson, Max Beesley, Robson Green,... Strike Back: Legacy (DVD)
Tim McInnerney, Michelle Yeoh, Sullivan Stapleton, Milauna Jackson, Max Beesley, …
R472 R259 Discovery Miles 2 590 Save R213 (45%) Ships in 10 - 17 working days

All ten episodes from the fifth series of the action drama based on the novel by former Special Forces operative Chris Ryan. In this series, Section 20 continue their globetrotting military missions as Sgts. Stonebridge (Philip Winchester) and Scott (Sullivan Stapleton) travel to Thailand to find the kidnapped daughter of the British Ambassador where they are caught up in a plot to bomb the embassy. After a North Korean general dies in the blast, Stonebridge and Scott investigate the covert crime syndicate known as Office 39 who planned the attack to provoke a North Korean war with the West.

Optimal Spacecraft Attitude Controlusing Aerodynamic Torques (Paperback): Michael Luke Gargasz Optimal Spacecraft Attitude Controlusing Aerodynamic Torques (Paperback)
Michael Luke Gargasz
R1,284 Discovery Miles 12 840 Ships in 10 - 17 working days

This thesis introduces a method of three-axis spacecraft attitude control using only aerodynamic torques. Attitude actuation is achieved using four control panels mounted on the rear of a cubical spacecraft bus. The controller consists of an outer loop using linear state feedback to determine desired control torque and an inner loop to choose appropriate control panel angles. The inner loop uses a Jacobian-based approachto invert the nonlinear relationship between panel angles and generated torque. Controller performance is evaluated via simulations, which show that three-axis control is possible over a range of initial angles and angular rates. The analysis used partial accommodation theory as the basis for aerodynamic torque calculations and assumed a rotating atmosphere with an exponential density profile.

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