Some explains on https://www.sciencedirect.com/science/article/pii/S0167610519300327 and also
abstract and full text on request on
And about “induction factor”:
https://www.sciencedirect.com/topics/engineering/induction-factor
By some tests I made, there are significant losses during crosswind figure because of the variation of power from that of cosine, above all for very large figures.
Small figures like on Low radius loop seems to produce roughly the same power. It is because the lesser swept area is compensated with a better swept area closest to the centre of the flight window, as a result lesser power variations.