Natural stability and the parachute principle in aeroplanes by LeMaitre W

Author:LeMaitre, W
Language: eng
Format: epub
Tags: Airplanes, Aeronautics
Publisher: London, E. & F. N. Spon, ltd; New York, Spon & Chamberlain
Published: 1911-03-25T05:00:00+00:00

CHAPTER VI.

THE DESIGN WHICH FULFILS THE CONDITIONS.

IN constructing any sort of machine it is usual to first obtain the most important device and then to build up the accompanying parts to that. We have now succeeded in evolving the thing we set out to look for, i.e., a plane which will fly and lift with the minimum of head resistance, and which is absolutely stable laterally and longitudinally by reason of its construction and without any interference from the pilot or the employment of balancing devices of any description. We have now to fit the propelling apparatus, car, and chassis on to this.

Fortunately, the design is one that lends itself easily to manipulation, which is not always the case with models. The short span of the planes, for instance, with the dihedral angle, at once suggests girder construction (see Figs. 29, 30), which is, perhaps, the strongest of all devices, being an M strut girder, familiar to us in numberless bridges.

The photo which forms the frontispiece of this book, and which, by the way, makes the car look much too large owing to its position nearest the camera, represents a 6-foot model which was exhibited at the

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