About: Akaflieg Darmstadt D-40     Goto   Sponge   NotDistinct   Permalink

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The Akaflieg Darmstadt D-40 is an experimental variable geometry single seat sailplane, fitted with almost full span, camber changing flaps for optimum aerodynamics in weak thermals and integrated into the wing so as to minimise flap tip drag. One flew successfully but the D-40, like other variable geometry sailplanes, was not commercialised.

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rdfs:label
  • Akaflieg Darmstadt D-40 (en)
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  • The Akaflieg Darmstadt D-40 is an experimental variable geometry single seat sailplane, fitted with almost full span, camber changing flaps for optimum aerodynamics in weak thermals and integrated into the wing so as to minimise flap tip drag. One flew successfully but the D-40, like other variable geometry sailplanes, was not commercialised. (en)
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sameAs
span m
stall speed kts
wing area note
  • flap retracted; 11.5 m2 extended (en)
wing area sqm
wing loading kg/m
wing loading note
  • minimum, flaps in, 52.63 kg/m2 maximum. Flaps out, 28.70 kg/m2 minimum, 43.48 kg/m2 maximum (en)
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dbp:primeUnits%3F_
  • met (en)
first flight
national origin
crew
designer
  • K. J. Heer and D. Teves (en)
manufacturer
ref
  • Jane's All the World's Aircraft 1987/8 (en)
type
  • Experimental high performance sailplane (en)
has abstract
  • The Akaflieg Darmstadt D-40 is an experimental variable geometry single seat sailplane, fitted with almost full span, camber changing flaps for optimum aerodynamics in weak thermals and integrated into the wing so as to minimise flap tip drag. One flew successfully but the D-40, like other variable geometry sailplanes, was not commercialised. (en)
airfoil
  • Inner Wortmann 67 - VG - 170 ; at tips, Wortmann FX60 - 126 (en)
aspect ratio
empty weight kg
g limits
  • +5.3/-2.6 (en)
gross weight kg
gross weight note
  • Maximum 500 kg with water ballast (en)
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