This is my attempt at building a prandtl d wing from Dollar tree foam board. The designers directly from Al Bowers work at NASA among the others and from the AMA modeling website on Prandtl-D.
It is the practical application of mr. Prandtl 1930s paper on the subject. It essentially answers why birds don't need Rudders. The twist at the wingtips here end up creating pro verse y'all allowing the wing to turn into a bank turn essentially.

Using an iron on cotton, I was able to get a thin trailing edge on the dollar tree foam board (DTFB) and the typical nerdnic speed design. Next step is glide test, and control surfaces

If you wish to see you more follow the links below:

NASA:
On Wings of the Minimum Induced Drag: Spanload Implications for Aircraft and Birds - NTRS - Nasa
PDFNASA (.gov) › ntrs › casi.ntrs.nasa.gov

AMA:
[ Ссылка ]

AL Bowers' talk:
[ Ссылка ]

Nic Lechner: [ Ссылка ]


My build log on Flite Test Forums:
[ Ссылка ]

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