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2824-2 [9] Mecaline automatic 25.6 4.6 25 28800 4 38 2826-2 [10] Mecaline automatic ... ETA Mechanical movement features Caliber Hours Minutes Seconds Date Day
Hamilton Khaki Field Officer H70615133 with Swiss ETA 2824-2 movement. One workhorse of the ETA mechanical line is the ETA 2824–2, The 2824 is an automatic winding, twenty-five jewel movement, available in four executions or grades: Standard, Elaborated (improved), Top and Chronometer. [4]
angle of attack α: angle between the x w,y w-plane and the aircraft longitudinal axis and, among other things, is an important variable in determining the magnitude of the force of lift When performing the rotations described earlier to obtain the body frame from the Earth frame, there is this analogy between angles:
The Eta is an example of a trend in glider development in which private pilots initiate the development of new open class gliders. The private development of the Concordia sailplane promises a further elevation of the max lift-to-drag ratio to slightly over 75 at 137 km/h (85 mph; 74 kn). [2]
The rates of change of lift and drag with angle of attack (AoA) are called respectively the lift and drag coefficients C L and C D. The varying ratio of lift to drag with AoA is often plotted in terms of these coefficients. For any given value of lift, the AoA varies with speed. Graphs of C L and C D vs. speed are referred to as drag curves ...
Drag and lift coefficients for the NACA 63 3 618 airfoil. Full curves are lift, dashed drag; red curves have R e = 3·10 6, blue 9·10 6. Coefficients of lift and drag against angle of attack. Curve showing induced drag, parasitic drag and total drag as a function of airspeed. Drag curve for the NACA 63 3 618 airfoil, colour-coded as opposite plot.
Lift comes from having air at a lower pressure above the wing than below. In the case of aircraft with more than one wing, one above the other, the higher pressure below the upper wing and the lower pressure above the lower wing will tend to equalize and so reduce the lift available. The closer together the wings are the more dramatic is this ...
In both cases the lift vector is the same (as seen by an observer on the ground), but in the latter the vertical axis of the aircraft points downwards, making the lift vector's sign negative. In turning flight the load factor is normally greater than +1. For example, in a turn with a 60° angle of bank the load factor is +2. Again, if the same ...
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