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Aviation History
1925
1925 - 0469.PDF
JULY 23, 1925 AIR MINISTRY NOTICES Aerial Navigators' Licences—Conditions of Examina-tion 1. ARRANGEMENTS have been made for the examinationof candidates and issue of licences to act as aerial navigators. 2. There -will be two classes of navigators and two examina-tions—first and second class. Candidates must pass the second-class examination before taking the first-class exami-nation. 3. The syllabi and conditions of examination may beobtained on application to the Secretary, Air Ministry (A. and L.), Kingsway, London, W.C. 2. 4. An examination for second-class navigators will be heldabout the end of September. A further Notice will be issued giving details of place and time of examination. The exami-nation is expected to last two or three days. 5. Applications to sit at this examination should be sentto the Secretary, Air Ministry (A. and L.) not later than August 15. Candidates should give, with their applications,full details of any qualifications they already possess. 6. The conditions of examination now announced takethe place of those detailed in C.A. Publication 2, the with- drawal of which was notified in Notice to Airmen No. 31 of1925. The requirements as to medical examination specified in the Air Navigation Directions are not affected by thisNotice. 7. For the time being, the holder of a licence ot either classwill be qualified to navigate aircraft in accordance with Article 5 (2) of the Air Navigation (Consolidation) Order,1923. At a later date it is intended to introduce more stringent conditions, which will require the carriage of afirst-class navigator on certain flights. 8. PREVIOUS NOTICES.—Notice to Airmen No. 31 of 1925is hereby cancelled. (No. 36 of 1925.) Holland ; Flushing Meteorological Ground Signals 1. THE meteorological ground signals at Vlissengen(Flushing) will, until further notice, be displayed for :— Schiphol At 0745 and" 0845 hours. Rotterdam .. .. „ 0945, 1045, and 1345 hours. Ostend ,, 0819, 0919, 1519, and 1619 hours.The ground signals for Rotterdam which are displayed after reception of the 1345 weather report will remain unchangeduntil 1819 unless weather conditions at Rotterdam undergo a change necessitating an alteration in the ground signalsdisplayed, in which case the Rotterdam-Waalhaven W/T Station will immediately inform the patrol ship Buffel atVlissingen, whose personnel is responsible for displaying the ground signals. Note.—The times given above are G.M.T, Add 1 hour to convert them into B.S.T., and 1 hour 20 minutes to convertthem into A.S.T. (Amsterdam Summer Time). 2. INFORMATION AFFECTED. The Air Pilot Appendix, page 43, paragraph 73, is affected.Notice to Airmen No. 116 of 1924, and Section 4, paragraph (1), page 10, of the Air Pilot Monthly Supplement No. 7 arecancelled. 3. AUTHORITY. Netherlands Notice to Airmen No. 21 of 1925.(No. 38 of 1925.) Cross-Channel Flights of Aircraft not Equipped withW/T Apparatus IT is notified that in future the following arrangementswill be available for pilots of aircraft not equipped with W/T apparatus, who wish to have their passage across the channelreported by W/T :— (1) It is of the utmost importance that any pilot whodecides to avail himself of these arrangements shall, after signalling his departure at one of the places named below,also signal his arrival on the other side of the Channel. (2) The reporting points arc as follows :—Lympne aerodrome. Ostend aerodrome. St. Inglevert aerodrome. Calais semaphore station at Village des Baraques. (3) An aircraft leaving England must circle once overLympne aerodrome at a height of not more than 1.000 ft. The departure of an aircraft making this signal will be re-ported immediately to Ostend and St. Inglevert. (4) An aircraft on arriving over Ostend or St. Inglevertaerodrome, or the Calais semaphore station, must circle once at a height of not more than 1,000 ft. The arrival of anaircraft making this signal will be reported immediately to the Air Ministry, London. (5) In a similar way an aircraft departing for Englandmust circle once over the aerodrome at Ostend or St. Ingle- vert, or over the Calais semaphore station, and signal itsarrival in the same way at Lympne. The departure of an aircraft making this signal will be reported immediatelyto Lympne and its arrival at Lympne reported to the Air Ministry. (6) An aircraft, signalling in the manner indicated itsdeparture from either side of the Channel, which is not reported as having arrived on the other side within one hourafter departure will be treated by the Air Ministry as missing and steps taken to warn all shipping and to put in train suchother action as may be possible to carry out a search and to effect a rescue. Air Pilot.—Aniamendment to the air pilot will be notifiedin due course. (No. 40 oi 1925.) AERONAUTICAL RESEARCH COMMITTEE REPORTS FROM the number of enquiries we receive it appears that there is a desire in aircraft circles to know approximately the contents of the various technical publications of the Aeronautical Research Committee. All the aircraft firms probably receive these reports regularly, whether or not they contain anything of immediate interest or utility. In the case of draughtsmen, however, and others interested in aeronautics, who can hardly be expected to purchase all the reports, the problem of deciding whether any publication interests him is often a difficult one. As it is obviously desirable that the knowledge of aeronautics should be made available to all who take an interest in the subject, we have arranged with the Air Ministry to publish in FLIOHT summaries of all the technical publications as soon as these are issued, or shortly before they are published. All A.R.C. publications can be purchased from H.M. Stationery Offices at Adastral House, Kingsway, London, W.C.2 ; 28, Abingdon Street, London, S.W.I ; York Street, Manchester ; 1, St. Andrew's Crescent, Cardiff ; 120, George Street, Edinburgh, and through any bookseller. Discontinuous Flow Around the Edge of a Bluff Obstacle. By L. W. Bryant, B.Sc, A.R.C.Sc, and D. H. Williams, B.Sc. Reports and Memoranda, No. 962. (Ae. 178.) (4 pages and 13 diagrams.) January, 1925. A question of general interest which often arises in practiceis the correct shaping of the nose of a body in order that the eddying region immediately behind the nose may be as smallas possible. The experiments herein described have a bear- ing on this question, and the results should prove useful as astarting point in determining the best shape of the leading parts of three-dimensional bodies for specific purposes, par-ticularly when a certain degree of bluff ness is unavoidable. A rectangular block of 6 ins. by 8 ins. section was fixedvertically from roof to floor in a 4-ft. wind tunnel, with an 8-in. face at right angles to the wind. The shape of the boun-dary line of the region of " cliff eddies " was determined by photographing a narrow smoke jet of ammonium chloride.Subsequently the two front edges were chamfered or rounded off in various ways and the extent of the eddying regionssimilarly determined in each case. It appears that the eddying behind the nose can be con-siderably reduced by very moderate fairing of the sharp edges ; and it is shown that the best shape of fairing dependsupon the amount of material which it is permissible to remove from the edges. A comparison made with the lines of discontinuity as cal-culated in accordance with the theory of two-dimensional discontinuous motion of a perfect fluid, shows excellent agree-ment for the first inch or two of flow from the edge of the block. It is considered that the results herein described may proveuseful as a starting point in determining the best shape of the leading parts of three-dimensional bodies when a certaindegree of bluffness is unavoidable. 469
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