Engineering Analysis of Flight Vehicles by Holt Ashley

Author:Holt Ashley
Language: eng
Format: epub
Publisher: INscribe Digital
Published: 2013-04-07T04:00:00+00:00

Symbols in (6.30,31) are defined in Table 6.2, except for the derivatives of the aerodynamic-propulsive coefficients. Our next task is to discuss how the more significant of these derivatives may be roughly estimated from what we know about the forces and moments produced by the various parts of a cruising aircraft. Their precise determination must be left, of course, to that interactive process of testing and refined analysis to which we often allude in this book. As our review proceeds, we hope that you will seek a “feel” for both the physical meaning and the relative importance of each term in the two systems.

In anticipation of how they will be solved, let us mention that (6.30, 31) are ordinary differential equations in time, linear and with constant coefficients. Since it was for such situations that the Laplace-transform apparatus was evolved, we shall embrace it. Indeed, with zero initial conditions at = 0, transformation requires merely that we substitute the variable s for each of the D-operators.

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