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Shouldn't all of this be under the "aircraft engineering" topic?

I don't think it was effective. The spitfire was flying at about M=0.5 if I remember well, so compresibility is, though noticable, not important enough to have any benefits from a not too good area rule that resulted by chance.

Without going into the question that you'll need a variable shroud geometry for proper off-design, I don't think this will work (I'm not sure). If the blade tip is close to the wall, the wall serves to prevent the formation of the tip vortex. If there is no wall, the tip vortex will be there...

Hi, I have two questions on vortex computations. Imagine that I've got a vortex ring in space. Each separate vortex bar is modelled with a circulation Gamma. In order to prevent a singular point computing velocities by means of a Biot-Savart method, I included a viscous core with a linear...