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Aviation History
1914
1914 - 0918.PDF
t/DCHll SEPTEMBER 4, 1914. well under 5 or 10 degrees. Suppose, however, that the wind be judged by the eye alone ; say the speed truly to 30 per cent., the direction truly to 10 per cent; what then is the likely range of error in steering by compass an air craft having a natural speed of 60 miles an hour ? As a particular case, suppose a wind of 20 miles an hour blow squarely across her desired course. The pilot, misjudging the wind speed by 30 per cent., will think it six miles faster or slower than it really is. When he has pointed his course to the best of his ability he will be advancing towards his goal at 60 miles an hour and drifting sideways six miles an hour. The error in steering is thus an angle whose tangent is one-tenth or an angle of 5!°. The lengthening of course due to this error is about one half of one per cent., and the drift off course about 60 miles in a voyage of 600 miles. If the whole direct course be 1,200 miles,and no correction for drift be made during the first half of the voyage, this half is lengthened out by the error to the extent of about half a per cent, of 600 miles, or about three miles. " From the foregoing discussion of the navigating de vices and of the consequences of error in steering, it appears that no grave evil is to be expected from steer ing over any length of sea course terminating on a liberal coast line, say of 2°, or 120 nautical miles, provided that a powerful and long-sustained storm be not encountered." ® ® ® IKe Raved &ero Clu. of the UratecL Kir^gdo OFFICIAL MOTICES TO MEMBERS BE Aviators' Certificates. 881 THE following Aviators' Certificates have been granted :— 878 Engine Room Artificer John Watson Jean, R.N. (Maurice Farman Biplane, Central Flying School, Upavon). 882 Aug. 19th, 1914. Flight Sub-Lieut. James Douglas Maude, R.N. (Maurice Farman Biplane, Central Flying School, Upavon). 883 Aug. 19th, 1914. Richard Cecil Hardstaff(E.A.C. Biplane, Eastbourne School, Eastbourne). Aug. 20th, 1914. 879 880 (Hydro-Aeroplane). Petchell Burtt Murray (Lakes Hydro- Biplane, Lakes Flying School, Windermere). Aug. 21st, 1914. William Orchard Usher Purnell (Henry Farman type Pashley School, Shoreham). Aug. | • 21st, Biplane, 1914. Master Mariner Richard Upton (Grahame-White Biplane, Grahame-White School, Hendon). Aug. 26th, 1914. • " - HAROLD E. PERRIN, Secretary. 166, Piccadilly, W. FROM THE BRITISH FLYING GROUNDS. Royal Aero Club Eastchurch Flying Grounds. Naval Flying.—There has again been quite a great deal of flying during the week, the following machines being up nearly every day: Maurice Farman, Bristol tractor, 1, 2, 10, 63 Shorts, Deperdussin. Flight-Com mander McClean's machines left for service on Capt. R. Upton, who has passed (or his brevet at the Grahame-White Aviation School at Hendon. Thursday, the transport on motor cars, 1 machine on Friday. Short Bros, despatched another seaplane to Isle of Grain for Admiralty. Civilian Flying.—Mr. Alec Ogilvie made several flights during the week on his 35 Wright. Brighton-Shoreham Aerodrome. Pashley Bros, and Hale School.—Instructors last week :—E. and C. Pashley and Hale. Up with instruc- Mr. F. Courtney, •who has recently passed his test for tibe Royal Aero Club certificate at the Graham e-"V7hite School, Hendon. tor:—C. Winchester, Mrs. Vincent. Straights,alone:— Mrs. Vincent. Circuitsandeights:—E. Roberts, C. Rutlen, J. Woodhouse, C. Winchester. Certificate :—E. Roberts- 918
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