Minutes of Proceedings of the Institution of Civil Engineers Volume 32, PT. 2
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...thus increased if the obliquity was very small. The theoretical aspect of the conditions inherent in the intrusion of the plane into undisturbed fluid, in virtue of the superadded edgeways component of motion, pointed to this quasi-paradoxical conclusion; and Hutton's experiments distinctly, and Vince's and Beaufoy's, though less clearly, presented indications of its truth. (3.) The excess of resistance experienced by a plane moving with a high degree of obliquity explained the otherwise inexplicable phenomenon of the support offered by the air as an inclined plane to the rotating Australian weapon 'boomerang, ' which, in virtue of its rapid rotation, virtually or approximately realised a normal resistance to normal motion, as great as that due to the whole area covered by it while rotating, even when rotating locally and without progression edgeways through the air; and probably a far greater normal resistance when the edgeways motion was superadded. Whereas, according to the popular law which referred the normal pressure to (sin.2 6), the normal motion should be as rapid when the weapon was spinning and travelling edgeways as when at rest. It was in virtue of this same condition of rotation, combined with progression, that a screw propeller, consisting of a pair of comparatively narrow sectorial blades, realised the reaction (available for propulsive action) due to the whole 'disc of rotation;' or perhaps it would be more correct to say, due to the dynamic resistance of the whole cylindrical column of fluid traversed by it in its rotative progression. In point of fact, a two-bladed screw of ordinary proportions rotating locally without progression, at a speed due to a given velocity of progression, experienced about as much propulsive...
- Paperback | 164 pages
- 189 x 246 x 9mm | 304g
- 13 Sep 2013
- Illustrations, black and white