A question regarding aerodynamics and weight-to-lift rations.

[Gawdzilla Sama]

Sister Bertrille's head piece would have worked fine underwater.

As for the TV show, as I recall, it was 'explained' her abilities were a miracle or gift from God.   Note, she had no propulsive system and minimal steering, she was entirely relying on the wind to get where she was going in a timely fashion.  I don't recall she had the ability to 'just go for a ride', she invariably wound up somewhere where she was needed by others, so the flight capabilities were used by God to carry out His agenda.

That sound ... Oh, it's just the Wright brothers weeping.