Familiar looking - Chinese buoyant airborne turbine (BAT)

[PierreB]

@dougselsam

in order for the BAT to provide aerodynamic lift from its tubular envelope, it must be tilted back, to establish a positive angle of attack. However, that tilts the rotor itself backwards, adding a downward component to its thrust vector, which would tend to push the entire apparatus toward the ground.

Relevant observation. I also noted this:

@PierreB

But lift generating and power turbine generating through the shroud can be incompatible. Indeed the required angle of attack to generate lift could mitigate the wind area on the shrouded turbine if it is tilted.