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The phugoid is a relatively low-frequency oscillation in which kinetic and potential energies are exchanged. The mode is generally characterized by low damping and approximately constant incidence: i.e. CL and CD both constant. In the following simplified analysis, it is assumed that the aircraft is initially trimmed straight-and-level at a horizontal speed V0. Lift and weight balance, as do thrust and drag.
We now assume that the velocity vector is perturbed from V=(V0, 0) to V=(V0+u, w) where u and w are small (relative to V0) perturbations in the x and z directions in the inertial (i.e. non-rotating and non-accelerating) axis system oxz. Using a local tangent approximation to the quadratic dependency of lift and drag on speed, the lift and drag will increase by small increments
Linear lateral dynamics The second order (two degree of freedom) Dutch-Roll approximation is an approximation to the abovefourth order system for the Dutch Roll dynamics. A jus
Continuous Casting : In essential, the process consists of pouring molten metal into a short vertical metal die or mould (at a controlled rate), which is open at both ends, coolin
Slipstream Effect. In passing through the propeller the air is accelerated and given a rotational velocity. The parts of the aircraft that are in the propeller slipstream wi
what is covered un this field?
Asymmetric Effect In general the axis of the propeller will be inclined upwards to the direction of flight due to the angle of attack of the aircraft. This causes the dow
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Spinning Reticle Seekers A spinning reticle seeker contains a single thermal detector and a spinning patterned disk - such as the ‘Rising Sun' Reticle. - consis
mobility and conductivity
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