Modified Schrenk distribution?

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In that case have a look at the following, it may save you a visit ...

The Nurflügel Page .

Multhopp, Hans: "Methods for Calculating the Lift Distribution of Wings (Subsonic Lifting Surface Theory)"; ARC RM 2884; 1950

Basic deign of flying wing models

The Panknin Twist Formula

Performance analysis of the "Horten IV" Flying Wing

Weissinger.: "The Lift Distribution of Swept Back Wings" NACA TM 1120,1947.

Wilkinson, K.G.: "The Horten Tailless Aircraft", RAE Report FA 259/1, T.N. No. Aero 1703, October, 1945.

Stadler. R. "Solutions for the Bell-Shaped Lift Distribution" PDF version

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