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Aviation History
1929
1929 - 1030.PDF
FLIGHT, MAY 16, 1929 K on circle No. 1 is just the same point as B on circle No. 2. To make good the track OF you have to steer the course OK, and this course is read on the graduations of circle No. 2 in B, where it is cut by the prolongation of OF. How to Use the Course Corrector A. Find the speed and direction of wind by the help of two drift observations on two different courses. The aircraft is first flying compass course 030°, and the drift is found to be +15°. The craft then changes its course to 080°, and the drift is found to be + 12°. The relative displacement of circles corresponding to the speed and direction of wind is then to be found in the following way :— The point of graduation 3 (030°) on the transparent disc is moved in negative (anti-clockwise) direction to the radius going through the point 030° — 15° = 015° on the white disc. The next operation is to move the point 8 on the transparent disc to the radius through the point 080° -f- 12° = 092° on the white disc in positive (clockwise) direction. This must be done by moving point 3 along the radius whereon it is placed, and until point 8 is on the radius through 92° on the white disc. This done, you screw up the clamping screw. You can now get from the instrument the following data :— (1) The speed of wind, represented by the distance between the centres. This is read directly on the white disc, where the circles divide the radii in tenths of the air speed of the craft, represented by the radius of the tenth circle. (2) The direction of wind. You look for the radius going through the centre of the transparent disc. This centre is always moved away from the centre of the white disc in the direction of wind. (3) Course to steer to make good a certain track. On the white disc, you note the track you want to make good. You follow the track till cutting the graduation of the transparent disc, and here you directly read course to steer. (4) Ground speed. The ground speed is represented by the line from the centre of the white disc to that point of gradua- tion on the transparent disc which represents compass course (course to steer). The ground speed, as well as the wind., is measured in tenths of the air speed of the craft. B. You have seen above how to determine the wind by two drift observations. If you know the wind from a meteorological report, you have only to give the centres of discs a relative displacement corresponding to a certain air speed of the craft. The corrector is therefore very useful when you are preparing a flight and want to know the influence of wind in various heights and various directions. Example: Wind, 210° 25 m.p.h., air speed 100 m.p.h. Find the course to steer to make good the track 120°. You can read directly that you must steer course 135°, and that your ground speed will be 96 m.p.h. C. How to find speed and direction of wind when ground speed and air speed, track and compass course are known. Ground speed . . . . 80 m.p.h. Air speed . . . . . . 120 m.p.h. Track 305° Compass course . . . . 290° The point 29 on the transparent disc is to be moved to the radius through point 305, on the white disc, and thereafter along this radius till the distance from the centre of the white disc is 6| tenths (80 m.p.h.). You then screw up and read directly : wind, 265°, 40 m.p.h. D. All other problems in connection with the triangle of velocities can be solved by this instrument. You can, for example, use it to determine the radius of action of an aircraft If you can determine the direction of wind on sea surface (compass bearing), it is enough for determining speed of wind to take one single drift observation on one course. Further particulars of this instrument may be obtained from Henry Hughes & Son, Ltd., 59, Fenchurch Street, London, E!C3. Lubrication of Aircraft Engines ON May 23, at 6.30 p.m., Mr. F. A. Foord will read his paper " Lubrication of Aircraft Engines," before the Royal Aeronautical Society. The paper will be read in the Lecture Hall of the Royal Society of Arts, 18, John Street, Adelphi, W.C.2. Mr. Foord, who is the Senior Technical Officer in charge of air-cooled engine design, fuels and oils at the Air Ministry, will deal with the difficulties of finding the ideal lubricant and will discuss the main features of modern aircraft engine lubrication systems, oil cleaners and oil coolers. The lecture will be illustrated with slides. METAL CONSTRUCTION : The above photo shows the erection of Bristol " Bulldogseater Fighters at the Filton works of the Bristol Aeroplane Co., Ltd. An order for a machines has just been obtained from Latvia. 404 ' all-steelnumber <-* these
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