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INITIAL PERFORMANCE EVALUATION OF THE HORTEN IV
When the Horten IV was first tested by the DFS in 1943 in comparison flights with the D-30 "Cirrus", it showed very good performance indeed, however, it's best glide ratio fell short of the estimated one: (L/Dmax = 32, instead of 37)
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Estimated
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DFS Tests
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Weight Empty
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We = 551
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500 lb
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Flight Weight (max.)
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W = 727
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720 lb
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Wing Loading
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W/S = 3.5
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3.55 Ib/ft2
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Max. Glide Ratio
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L/Dmax = 37
@ Vc = 45.3
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32
42.5 mph
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Min. Sink Rate
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wmin = 98.4
@ Vc = 37.3
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109 ft/min
34.8 mph
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Stall Speed
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Vc = 34.1
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30.4 !? mph
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Max. Lift Coefficient
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CLmax = 1.20
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1.49 !?
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Min. Drag Coefficient
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CDmin = N.A.
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0.01175
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Efficiency Factor
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e = N.A
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63 %
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