. Aerial navigation . ri-table precipice on either side. 3. By devising a lighter motor, in proportion to itsenergy. This is the great field in which work remains tobe done. It was announced in September, 1888, by anewspaper correspondent that Commandant Renard hadbuilt a motor weighing 1,100 lbs. and developing 50 H. P.,but since then nothing has been heard of it. 4. By simply building larger air-ships, for, inasmuch astheir contents, and consequent lifting power, will increaseas the cube of their dimensions, while their weight will,approximately, only increase as the square, the surpluslifti
. Aerial navigation . ri-table precipice on either side. 3. By devising a lighter motor, in proportion to itsenergy. This is the great field in which work remains tobe done. It was announced in September, 1888, by anewspaper correspondent that Commandant Renard hadbuilt a motor weighing 1,100 lbs. and developing 50 H. P.,but since then nothing has been heard of it. 4. By simply building larger air-ships, for, inasmuch astheir contents, and consequent lifting power, will increaseas the cube of their dimensions, while their weight will,approximately, only increase as the square, the surpluslifting power will evidently increase with the size, andgreater motive power in proportion can be used. Let us suppose, for the sake of this argument, that no im-provement whatever has been achieved in either of the firstthree ways which have been mentioned, and inquire simplywhat would be the effect of doubling the dimensions of LaFrance. The comparison will be approximately as follows : Principal Dimensions. Double Length, out to out ft. Diameter, largest section Contents of gas cub. ft. Lifting power lbs. Weight of apparatus Cargo and aeronauts and calculating the speed by the formula of Commandant Renard, and inserting thenew diameter, meters, we have : T — X x V3 in kilogrammeters. But as we have 182 H. P., and there are 7$ kilogram-meters in the H. P., we have further : 182 x 75 = x 16J2 X V\ whence V = i/ = meters. So that we see that the speed of the new air-ship will meters, or ft. per second, say 25 miles per hour. The same result is arrived at by considering that thenew balloon will require four times the motive power ofLa France to go at the same speed, and that the power re-quired increases as the cube of the speed. So that we seethat a speed of 25 miles per hour is even now in
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Keywords: ., bookcentury1800, bookdecade1890, bookidae, booksubjectaeronautics
