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1

The drag can be computed from Navier-Stokes momentum equations as: $$D=-\oint_{S_\infty}p\hat{i}\cdot d\vec{S} - \oint_{S_\infty}\rho (\hat{i}\cdot\vec{u})(\vec{u}\cdot d\vec{S})$$ Usually, all boundaries other than the rear boundary (Trefftz plane) would have the same flow properties as the free-stream, and they fall out of the integral. We are left with: ...


2

Although his design is based almost entirely on intuition and is wholly unworkable, as with most of Colani's design concepts, some recent study had made the swept supersonic propeller a fashionable topic of discussion at the time, but he pushed it way beyond its comfort zone. The idea of the sweep is the same as for the swept wing; to delay the onset of ...


2

Looks like the Colani Museum has picked up my question on Twitter and posted a response later with an archive photo of an advertising article: The English part of the article says about the propellers: Since 1976 we have been investigating sharply cambered pusher and tractor propellers which maintain supersonic flow over part of their top surfaces. In ...


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