Epitome of the Aeronautical Annual1910 |
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ABBOTT LAWRENCE ROTCH aerial navigation aerodrome Aeronautical Annual aeroplanes angle ascending automatic balloon blades blowing Blue Hill body boiler carried centre of gravity CHANUTE circle CONGRESS LIBRARY CONGRESS THE LIBRARY constructed curved dead calm degrees descending direction distance edge exertion experimenter feet per minute feet per second flying experiments flying machine flying-machine force forward front gliding ground gusts horizontal horse-power inches inclined increased kite Langley launch LIBRARY OF CONGRES LIBRARY OF CONGRESS lifting effect ments metres per second miles an hour miles per hour models motion motor moving necessary observations Observatory obtained OCTAVE CHANUTE OTTO LILIENTHAL plane position possible pounds practical pressure principle propellers raised resistance rise rudder sailing flight screw shown side soaring birds speed square feet square foot steam steam engine steering stork sustaining surface tion upward velocity vertical weather weight wheel WILBUR WRIGHT wind wings
Pasaje populare
Pagina 84 - ... do not recollect ever having seen one of these birds flap its wings. Near Lima, I watched several for nearly half an hour, without once taking off my eyes : they moved in large curves, sweeping in circles, descending and ascending without giving a single flap.
Pagina 213 - It is very much the same in learning to ride a flying machine; if you are looking for perfect safety, you will do well to sit on a fence and watch the birds; but if you really wish to learn, you must mount a machine and become acquainted with its tricks by actual trial.
Pagina 213 - Now there are only two ways of learning to ride a fractious horse : one is to get on him and learn by actual practice how each motion and trick may be best met; the other is to sit on a fence and watch the beast a while, and then retire to the house and at leisure figure out the best way of overcoming his jumps and kicks.
Pagina 139 - ... degree of accuracy in the balance had been obtained which had not been hoped for. Still there had been such a long succession of disasters and accidents in the launching that hope was low when success finally came. I have not spoken here of the aid which I received from others, and particularly from Doctor Carl Barus and Mr.
Pagina 157 - I feel perfectly confident, however, that this noble art will soon be brought home to man's general convenience, and that we shall be able to transport ourselves and families, and their goods and chattels, more securely by air than by water, and with a velocity of from 20 to 100 miles per hour.
Pagina 201 - ... it became quite unmanageable. The wind acting upon the already tightlystretched webs, their united pull caused the central boards to bend considerably, with a twisting, vibratory motion. During a lull, the head and shoulders were inserted in the triangle, with the chest resting on the base board. A sudden gust caught up the experimenter, who was carried some distance from the ground, and the affair falling over sideways, broke up the righthand set of webs.
Pagina 172 - ... as a centre, and of being fixed in any position. The powers of the machine being previously balanced, if the least pressure be exerted by the current either upon the upper or under surface of the rudder, according to the will of the aeronaut, it will cause the machine to rise or fall in its path so long as the propelling force is continued with sufficient energy.
Pagina 168 - ... the weight and distance from the centre of the section elevated above the water, by any given heel of the boat, on one side; and on the bulk, and its distance from the centre, which is immersed below the water, on the other side; the combined endeavour of the one to fall and of the other to swim, produces the desired effect in a well-constructed boat.
Pagina 167 - If the upright shaft be elastic or have a hinge to give way a little, near their tops, the weight and resistance of the parachutes will incline them so as to make a small angle with the direction of their motion, and hence the machine rises. A slight heeling of the parachute towards one side, or an alteration in the position of the weight, may enable the aeronaut to steer such an apparatus tolerably well; but many better constructions may be formed for comFlg.
Pagina 84 - If the bird wished to descend, the wings were for a moment collapsed ; and when again expanded with an altered inclination, the momentum gained by the rapid descent seemed to urge the bird upwards with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid so that the action of the inclined surface of its body on the atmosphere may counterbalance its gravity. The force to keep up the momentum of a body moving in a horizontal plane in tke...