Volume 8 No 3 Jun 1957.pdf - Lakes Gliding Club
Volume 8 No 3 Jun 1957.pdf - Lakes Gliding Club Volume 8 No 3 Jun 1957.pdf - Lakes Gliding Club
Performance of the AV-22 Two-Seaterby Charles FauvelT HE e'xamination by the Flight TestingCentre of the performance of this twoseatersailplane has confirmed the polarcurve (j)f velocities given herewith, whichshows that the AV-22 corresponds well toan all-purpose biplane: for dual controltraining, ab inirio, advanced and highperformance;and, if flown as a singleseater,for first solo, training, and highperformance with suitable equipment,including ballast if desired. It is normallyfurnished with radio, and optionally withrespirator.With the first model, NO. 01, a glidingangle in the region of 1 in 26 was attained(actually 1 in 25.6); this value will beexceeded in No. 02, which will incorporatesome refinements and will shortly put in anappearance. Its drag, moreover, remainsIc;ss than that ofconventional single seatersof 15 m. span and 5 m. length.The instructor's seat ,is raised nearly30 cm. (I foot) at the centre of gravity, andmoreover gives him exceptional visibilityand comfort, while he makes use of thesingle instrwnent panel in front.Thanks to the purchase premium, themachine will sell at about a million francs(£1,015) only to the clubs, complete inflying order with basic equipment (supplementaryequipment also benefits fromthe premium).Examination ofthe recording instrumentshas shown that the maximum speedattained with two up by M. Fauvel and hismechanic M. Herve, during the high speedtrials carried out for the Flight TestingCentre, was actually 270 km/h. (168 m.p.h.);this represents the highest controlled speedever attained iD France with a glider, and inthe same flight a pull-out of 5g was carriedout, likewise the highest measured."AV-22", rhe twoseaterversion ofM. Fauvel'sfamous''jfying wing".(Block reproduced bycourtesy of"TheAeroplane".)-136-
During this high-speed trial, a speed of230 km./h. (143 m.p.h.) was maintainedwhilst descending several hundred metres,giving a rate of sink of 13.30 m,fsec.(43.6 ft./sec.) or a gliding angle of only 1,2°.This enables the actual minimum dragcoefficient of the aircraft to be obtained,which is thus shown to be only 0.0153 (forthe AV-36, the minimum drag coefficient is0.0154) despite an old-fashioned thick aerofoilsection which, although having favourablecharacteristics at mOd\;ratc angles .ofattack, 'has quite a high minimum dragcoefficient.ROBERT KRONFELDOn lvinghoe Beacon in 1930. L. 10 R.: Robert Kron/eld beside h.is ..Wien"'; J. R. AshwellCooke (chairman, London Gliding Club), the Prince 0/ Wales, and E. C. GO/'don England(chairman, B.G.A.).IN selecting a pioneer of motorless flight tests three years after,as the subject of a shorl biography, one's Soon he became an instructor at thefirst choice naturally falls on Robert historic gliding centre on the Wasserkuppe,Kronfeld.. He was not the first to glide, nor one of the Rhon group of mountains nearwas he the first tQ soar; but he, more than Flankfurt-am-Main; and here, during theanyone, freed the sailplane ftom depen- German national contest of 1928, hedence on hill slopes and showed how it became the first pilot to use the upcurrentscould be flown to great heights and over under cumulus clouds by making an outlongdistances. Not until this was proved and-return flight to the Himmeldankbergpossible did soaring fljght really catch on in and back, 4! miles each way, returningone country after another, our own against the wind under a cloud street (aincluded.term not then invented). As an instance ofBorn in Austria, Kronfeld started gliding Kronfeld's care in leaving nothing to chancein 1927 at the Rossitten school in East in competition work, I remember seeing hisPrussia, and flew his C test there late in the team on that day repeatedly give him theyear, with the air below freezing point, exact wind direction by lying down end-toalmostcertainly in an open primary glider, end on a neighbouring promontory, theas the type was still being used there for C Pferdskopf.-137-
- Page 2 and 3: new altitude to glidingOu R new lig
- Page 4: Lasham to Land's Endby A. J. Deane-
- Page 7: tremely heavy whenever encountered,
- Page 10 and 11: House,-.lames's,I.ondon,-120-
- Page 12: -EASY HANDLING should combine witht
- Page 15 and 16: particularly good flying Qualities
- Page 17 and 18: Finally, how often should you lubri
- Page 19 and 20: Locking wire \~I \(a)At least 3 ful
- Page 21 and 22: 1t..,'LL~ ,. ~ 'you\~. ''I?sFor and
- Page 23 and 24: TOM DAVIDSON,C.FJ. - SCOTTISH GLIDI
- Page 25: B.G.A. NEWSNatianal Oampioasbips 19
- Page 29 and 30: the adjoining hill. At a lecture to
- Page 31 and 32: keep GOOD MEN DOWNandrs ofl.NES....
- Page 33 and 34: By th.is time I was down to 5,000 f
- Page 35 and 36: The1956-57 Australian Championships
- Page 37 and 38: counting themselves a no contest da
- Page 39 and 40: Na_P. WildburJ. J. ConnollyJ. F, We
- Page 41 and 42: hampering, though it was clearer so
- Page 43 and 44: Detection and Location of Thermalsb
- Page 45 and 46: THIS GLIDINGWHAT has happened to th
- Page 47 and 48: CluL~Ass~m1onNavs•ENTRIESare comi
- Page 49 and 50: CROWN AGENTSOUR A.G.M. was held on
- Page 51 and 52: · . . '. '""\OUTSTANDING ·1-26 fl
- Page 53 and 54: eaching 1,800 and 2,000 ft. on 2O-m
- Page 55 and 56: in his Kite 11, and this was the be
- Page 57 and 58: A.S.l. ,out of action" but Alan tol
- Page 59 and 60: BRISTOL GLIDING CLUBInitial T,ainil
During this high-speed trial, a speed of230 km./h. (143 m.p.h.) was maintainedwhilst descending several hundred metres,giving a rate of sink of 13.30 m,fsec.(43.6 ft./sec.) or a gliding angle of only 1,2°.This enables the actual minimum dragcoefficient of the aircraft to be obtained,which is thus shown to be only 0.0153 (forthe AV-36, the minimum drag coefficient is0.0154) despite an old-fashioned thick aerofoilsection which, although having favourablecharacteristics at mOd\;ratc angles .ofattack, 'has quite a high minimum dragcoefficient.ROBERT KRONFELDOn lvinghoe Beacon in 1930. L. 10 R.: Robert Kron/eld beside h.is ..Wien"'; J. R. AshwellCooke (chairman, London <strong>Gliding</strong> <strong>Club</strong>), the Prince 0/ Wales, and E. C. GO/'don England(chairman, B.G.A.).IN selecting a pioneer of motorless flight tests three years after,as the subject of a shorl biography, one's Soon he became an instructor at thefirst choice naturally falls on Robert historic gliding centre on the Wasserkuppe,Kronfeld.. He was not the first to glide, nor one of the Rhon group of mountains nearwas he the first tQ soar; but he, more than Flankfurt-am-Main; and here, during theanyone, freed the sailplane ftom depen- German national contest of 1928, hedence on hill slopes and showed how it became the first pilot to use the upcurrentscould be flown to great heights and over under cumulus clouds by making an outlongdistances. <strong>No</strong>t until this was proved and-return flight to the Himmeldankbergpossible did soaring fljght really catch on in and back, 4! miles each way, returningone country after another, our own against the wind under a cloud street (aincluded.term not then invented). As an instance ofBorn in Austria, Kronfeld started gliding Kronfeld's care in leaving nothing to chancein 1927 at the Rossitten school in East in competition work, I remember seeing hisPrussia, and flew his C test there late in the team on that day repeatedly give him theyear, with the air below freezing point, exact wind direction by lying down end-toalmostcertainly in an open primary glider, end on a neighbouring promontory, theas the type was still being used there for C Pferdskopf.-137-
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