VGC News/Newsletters - Lakes Gliding Club

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In 1932 the Akaflieg stm·ted the development of che 0 28, the subject of this article. The aim was to get good performance even in poor weather conditions by building a relatively small plane to the lowest possible weight. Iln this respect the D 28 is unique stiB to this day; the empty weight was 54 kg (119 lb.) with a wing span of 12 m. The main technical data: Span 12,0 m Wing Area 11,4 m2 Wing Aspect Ratio 12,6 Wing Profile Gottingen 535 modified Empty Weight 54 kg Wing 27 kg Fuselage 17 kg Empennage 6 kg Instruments 4 kg Payload 75 kg Maxil11l!Jm Weight 129 kg Wing loading 11,3 kg/m2 LID (Measured at DFS 23,5 at 60,5 km/h by Hans Zacher and R. Kreyser) Minimum Sink 0,66 m/s at 52,0 km/h Minimum Airspeed 43 km/h dJ-- --; Figure 2 : Rudder/Aileron Coupling Gear ~___ 5910-- - J Figure 3: Semi-damped Fin and Rudder Figure 1 : D 28 "Windspiel" The main student designers were R. Schomerus and R. Kosin. Rlidiger Kosin later played an important role as chief aerodynamicist for the first jet bomber ARADO 234. The one-piece wi1ng had one spar and a plywood torsion nose box. The wing was attached to the fuselage by three duralumin fittings. The full-span ailerons were operated in common mode for airt{jil camber control and in opposite mode for roll control. Rudder and ailerons were coupled by a special gear, so with increasing rudder deflection the differential function of the aileron was increased. This gear is shown in the Figure 2. The fin and rudder arrangement of the D 28 was "semi-damped". The fin moved together with the rudder, but only with 1f3 of the rudder deflection. These special details were unique; they were never used on other airplanes except the Darmstadt 0 30, which also had the semi-damped fin and rudder arrangement. Personal comment of Hans Zacher: "The manoeuvrability of the 0 28 at the low speed of 60 krn/h was really exceptional due to the semidamped rudder and the variable differential function of the aileron. The LID of 23,S was remarkable compared to the DFS Meise with 15 m span, a design which occured five years later. I liked to fly the D 28 and moved it lively around the three axes". The front fuselage was a conventional wood structure; the rear fuselage was a plywood tube over frames without stringers. The small weight was achieved by extremely careful design and construction and exceptional skill in the workshop. The D 28 was completely designed to the pre-war German sailplane airworthiness specifications BFS and was even certified for simple aerobatics. The following measures contributed to the low weight: 16
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Page 1 and 2: Price (UK) £3.95 Free to members
Page 3 and 4: VGC News No. 100 Summer 2000 Conten
Page 5 and 6: Meet Your Committee Membership Secr
Page 7 and 8: FROM THE MEMBERSHIP SECRETARY We ar
Page 9 and 10: B & B close to Norfolk Broads. THE
Page 11 and 12: Features WOLFRAM HIRTH IN JAPAN Tra
Page 13 and 14: masses of poisonous smoke, incandes
Page 15 and 16: The work was completed by June 1951
Page 17: problem; he should have been employ
Page 21 and 22: scene as "McHinz" and he trained ma
Page 23 and 24: "\1 ;- \ ' .. I' I" t I /~ ,'- / ,?
Page 25 and 26: President: Chris Wills, Wings, The
Page 28 and 29: 1 J
Page 31 and 32: Adhesive badges @ £0.50 each. Blue
Page 33 and 34: In 1923 tnking ,part in the light n
Page 35 and 36: Lissant Beardmore had also made the
Page 37 and 38: large enough for him. His start was
Page 39 and 40: G.P.I. on Monre Mollarone ready to
Page 41 and 42: THE VERY EARLIEST DAYS OF SWEDISH G
Page 43 and 44: As the machine mounts in the air on
Page 45 and 46: charge of its building. He also tes
Page 47 and 48: Wally Wolf's Grunau 4 to great heig
Page 49 and 50: This picture was sent by Fronds Hum
Page 51 and 52: Book Review Exploril/g the MOl/ster
Page 53 and 54: EFTS at Woodley, near Reading. It w
Page 55: XKIO "CLUB"VARIO SYSTEM * Over SOO

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