My question is, how high can be the angle of attack of a hang-glider, paraglider (the canopy) or a sailplane, gliding in still air.
Assuming a small glide ratio of 4:1, tha flight path is at 14 degrees with the horizontal line. If the glider was at the angle of attack 14 deg, that would mean...
Let me then put it this way. The leg-wing of the wingsuit (and let's concentrate on the wingtips / feet) gliding through :
1) still air
2) "vortice-affected" air
What will be the difference in aerodynamic DRAG that the leg-wing experiences in 1) and 2) ?
As for the vortice-path and glide ratio- the vortice may hit the feet. The angle of attack varies, and the hands may be positioned in such a way that the vortice lines go 'through' the feet (leg-wing wingtips).
IF they do, even if thay are small, do they increase drag on the legs or do they...
If you are not familiar with what a wingsuit is- you should google it.
Now...
Let's assume we have ourselves a wingsuit flyer in flight (or rather glide). Let's assume the arm-wings produce vortices on the wingtips and that these vortices hit the wingtips of the leg-wing ( which are where the...
A superfluid has zero viscosity.
Lift of an airfoil (and any shape for that matter) is zero without fluid viscosity. So, superfluids shouldn't generate lift when flowing around an airfoil.
Is that true? I think it is impossible for a superfluid not to generate lift on an airfoil, because...