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Aviation History
1910
1910 - 0113.PDF
li FEBRUARY 12, 1910. The diagram of velocities for the inward motion is given in Fig. 6. By measurement, or by calculation, AC is found to represent a velocity of 46 miles per hour. The time of flight for the double journey is, therefore, •60 60 , , . > + -> == 3'o2 hours, as against 3 hours in still air. (4) A flight along the four sides of a square course, each side 60 miles long, with the wind blowing parallel to two sides of the square. The course is shown to scale in Fig. 7. The time of flight along the two sides, AB and CD, taken together is 3*47 hours, as found in Case 2. The time along the other two sides, BC and DA, is 4 hours, as found in Case 1. Therefore the total time of flight is 4 + 3'47 = 7"47 hours, 240 as compared with = 6 hours in still air. (5) A flight along the complete perimeter of a regular hexagonal course of 60 miles side, with a wind blowing parallel to two sides. The course is shown to scale in Fig. 8. The time along the two sides AB and BE, is 3*62 hours as found in Case 3. The time along the two sides CD and FA, is also 3*62 hours. The time along BC and EF is 4 hours, as in Case 1. Therefore the total time taken is 3-62 + 3-62 + 4 = 360 11-24 hours as compared with = 9 hours in still air. If we reduce the hexagon to one having a perimeter of 240 miles, equal to that of the square, instead of 360 miles 24° as above, the time of flight will be 11*24 x-z =7*49 hours. By comparing this time with 7*47 hours, the time taken for the square course, it appears that the shape of the course does not very materially affect the time of flight, provided the course is of the correct perimeter, and is of the form of a regular polygon. We may The Kaiser at Tegel. •*•• ON the 4th inst., Ff.I.M. the Kaiser, accompanied by Prince Fushimi of Japan and Prince Henry of Prussia, paid a visit of inspection to the military airship l/ycHfj from the above safely assume that the time of flight round a circular course of 240 miles circumference would be practically 7^ hours with a wind of 20 miles per hour blowing, as against 6 hours in still air. On a course which is approximately circular, the effect of a wind blowing at half the speed of the machine is to increase the time of flight by one-quarter. With a greater wind velocity the effect on the time of flight would be more considerable, while if the velocity of the wind were equal to, or greater than, the velocity of the machine it would become impossible to fly round the complete perimeter of any closed figure. This con clusion affords an explanation of what it is reported Latham stated at Blackpool in connection with his brilliant flight on the Friday, viz., that if the velocity of the wind had equalled his velocity he would have been compelled to give up his attempt to fly round the course. ® ® headquarters at Tegel. He had hoped to see an ascent of the new " Gross III," but owing to the heavy fog this part of the programme was abandoned. Afterwards the Imperial party inspected the Wright flyers which are being constructed in an adjoining factory. Eastchurch "Flight Town," the Aero Club's Auxiliary Aviation Grounds on the Isle of Sheppay.— Our photograph .shows the rapid growth of the little colony which only started about three months ago. The "docks" seen, reading from right to left, are occupied by the following flyers' machines:—Mr- J. T. C. Moore - Brabazon, Mr, Percy Grace, Mr. F. K. McClean, Prof. A. K. Huntington, the Hon. C. S. Rolls, and Mr. Maurice Egerton. 109
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