-of Flight Measurements-Aerodynamics,Flutter, Fatigue. etc.; Work on LaminarAirfoils at Low Reynolds Numbers;Structures Using New Materials andMethods; Design of Flight Control Systemsand Control Surfaces; Analyses ofNew Sailplane Designs.METEOROLOGICAL PAPERS are desiredon, but not limited to; MeteorologicalFlight Reports on Record or other ExceptionalFlights; Satellite Observationsof Interest to Sailplane Pilots; The FlowProfile of Thermals: Advances in Instrumentation;High Altitude Soaring-Experienceand Theory.CoMBINED TECHNICAL AND METEOROLOGICAL SESSIONs.-The theme for thissession will be: Matching weather, contesttask and sailplane characteristics.Some suggested titles are: SoaringClimatology of 'Contest Sites; OptimumMeteorological Conditions for Specific.Tasks; Optimum Sailplane Characterisitics for Specific Contest Tasks; Optimum'Overall Sailplane Characteristics for:Specific Geographical Conditions.Authors must submit titles as soon aspossible, and completed papers by 15thApril, 1965, to:Scientific Chairman: Dr. Joachim P.Kuettner, 2919. Thompson Circle, SE,Huntsvil!e. Alabama, U.S.A.; orTechnical Chairman: Lt.-C01. FloydJ. Sweet (Rtd.), 5649 Massachusetts Ave.,Falls Church, Virginia 22043, U.S.A.Mr. Alan Yates's address during theweek is: Coombe Lodge, Blagdon, Nr.Bristol (Tel. Blagdon 503); but he canstill be reached at Technical College,Bath.PICTORIAL ANALYSIS IN FLIGHTBy BRENNIG JAMESWHEN you fly, you are looking at apicture which is steadily growingand appearing to radiate from a centralpoint which we shall call the point ofzero parallax (Fig. 1). At a good altitudethis effect is too slow te be clearly apparent,but flying through rain or snowit is a dramatic sight.Clearly the point of zero parallax isyour destination. The recognition of thispoint is rapid and instinctive, if, forexam~le, you skid your car: as it begins12to spin,. your head and eyes will automaticallyturn 10 stay fixated on theP.Z.P.This. 'skill is not specially related toflying, but it is one of the main means.whereby you navigate when you walkor run; the effect experienced by a dogwhen it runs through long grass must bevery dramatic and is clearly pleasurable.(If you ever see an object steadily increasingwith zero parallax, duck!)J1le P.Z.P. tells you where you are• g01Og; how do you know where you are?, When you are airborne, the earth is yourmost important navigational aid, sinceits position will tell you where you are.On the drawing board you establish aposition by Cartesian co-ordinates (Fig_2), but in the air your instinctive positionsense is based on radial co·-ordinates(Fig. 3).Three-dimensional positioning is basedon the diagnosis of perspective, and it isl'5lo1OATH"lEAST .)
well that you should understand how itis done. as it will make your judgmentof height and position in the air moreeasy and accurate. It is best that youshould practise this by holding a bookin your hand and studying its change ofappearance with change of position.t>retend that you are a fly coming in tolamd 00 it; baving just returned froma mission .to the larder. As you fly vert,icallyover the book, you se~ it in planview (Fig. 4); you now throttle back andwing-over into your cross-wind leg; anotherturn and you are on your approach.Two, four, six, all legs downand your airfield looks like Fig. S. <strong>No</strong>tethat, as you are a good way away. thenear and far boundaries lQok about thesame length. As you get nearer. the farone will stay about the same size butthe near one will appear to get longer, aprocess called foreshortening.Look out-you are much too low (Fig.6); you know .this because the airfieldlooks too widc ~n relation to its depth,so shove on full throttle till it looks likeFig. 7; hold it and ease yourself ownto a nice gentle six-po.inter.<strong>No</strong>w keep on practising with yourTHREE COUNTIESAERO CLUB LTD.FIG.4l \FIG.SFIG-.7book; it's the cheapest flight simulatoryou'll ever get!Blackbushe Airport, Nr. Camberle.y, .SurreySpecial Courses for Glider Pilots to obtainPriva,te Pilot's UceMe<strong>No</strong>rmal Courses for Private Pilot's LicenceNight flying -Instrument FlyingCharter and Pleasure FlyingResidential Courses availableC.F.I. Mr. Derek JohnsonYATELEY 215213
- Page 1 and 2: SA LP A&GLIDIGFebruary - March 1965
- Page 3 and 4: SAILPLANE& GLIDINGOFFICIAL ORGAN OF
- Page 5 and 6: 1965 WORLD G,LIDINGCHAMPIONSHIPSHE
- Page 7 and 8: FRED SLINGSBY'S RETIREMENTANY are t
- Page 9 and 10: D-34(o)D·36Polyt 3Kria7
- Page 11 and 12: dead into sun, and the haze made VI
- Page 13: its normal position lies very near
- Page 17 and 18: TESTING A SOVIET DISCOPLANEBy V. IV
- Page 19 and 20: cursed. The designer looked despond
- Page 21 and 22: SECOND NEW ZEALAND CHAMPIONSHIPSHOO
- Page 23 and 24: •Official rest day.three pilots a
- Page 25 and 26: 1965 COURSES AT LASHAMHE 196'5 cour
- Page 27 and 28: LEE WAVE uGEN" FOR AEROPLANE PILOTS
- Page 29 and 30: of the Sheffield gale. The other is
- Page 31 and 32: IT wasn't just having to get used t
- Page 33 and 34: change, my man," I sa.id grandly, a
- Page 35 and 36: outes. It's all a snare and a delus
- Page 37 and 38: electrical horizons 'have complete
- Page 39 and 40: Finally, the turn-and-slip indicato
- Page 41 and 42: 1964 KRONFELD ART EXHIBITION AND196
- Page 43 and 44: Loi61U ;nOrder Pi/or Points 1964 Or
- Page 45 and 46: RHODESIA'S FIRST 500 KILOMETERSBy E
- Page 47 and 48: 2-3~ en154.2'-'5-0 IDID6 0 en~c7
- Page 49 and 50: JIy30-40506"0 70 8"0 9"0I I I I, eq
- Page 51 and 52: BRITISH GLIDING ASSOCIATION NEWSCHI
- Page 53 and 54: wings ar~ lewel. If you can do this
- Page 55 and 56: T" T I G" I. 1.111 Y 11 74'0THEKRON
- Page 57 and 58: as the squall struck us, about half
- Page 59 and 60: about 3,000 feet, at which altitude
- Page 61 and 62: TRUE FLIGHT-A FABLEBy M. BIRDOOKING
- Page 63 and 64: iBOOK REVIEW•Great Flights and Ai
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will go on into the foreseeable fut
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I feel that the home-made winch wil
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FOR SALE (contd.)T.3IB, C. of A. fr
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BLACKPOOL AND FYLDEP"e.~enratioll o
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which we had from the Shaw Slingsby
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able piece ef Club equipment was bu
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And still he wasn't satisfied, this
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As usual, Lasham continues to opera
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to his usual standard. The surprise
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Margate before setting off in Sky.)
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CHEVIOTS (Acklington)SINCE our last
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a gliding record. He made his first
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The Boomerang.from a light-weight a
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The Club's order for a Ka-6 waschan
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Lindner, of Teek, with 2,434.2. - A
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A Gliding Holiday io Kentwith the K