Flight Without Formulae Simple Discussions On the Mechanics of the Aeroplane
Flight Without Formulae Simple Discussions On the Mechanics of the Aeroplane
Emile Duchne
The book Flight Without Formulae Simple Discussions On the Mechanics of the Aeroplane was written by author Emile Duchne Here you can read free online of Flight Without Formulae Simple Discussions On the Mechanics of the Aeroplane book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Flight Without Formulae Simple Discussions On the Mechanics of the Aeroplane a good or bad book?
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In the first case, there- fore, the turning move- ment produces a righting couple, in the second case an upsetting couple. This effect is the more pronounced the larger the angle of incidence. Therefore in the case of wings forming a lateral dihedral, a raised axis is stable, a lowered axis unstable, and the more so the greater the angle of incidence. This effect is added to the secondary effect already referred FIG. 63. Unstable. Lateral V with lowered axis. STABILITY IN STILL AIR 149 FIG. 64.... Unstable. Lateral A with raised axis. to in the case of straight wings ; but as soon as the dihedral is appreciable, the former effect becomes by far the stronger. Now consider the case of wings forming an inverted dihedral or A. The same line of reasoning shows (see figs. 64 and 65) that : In the case of wings forming an inverted lateral dihedral a raised axis is un- stable, a lowered axis stable, and this the more so the smaller the angle of incidence. In this case the secondary effect acts in opposition, but it becomes negligible as soon as the inverted dihedral is appreciable.
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