my current favorite brushless generator for series hybrid aircraft is a rotary:
https://capitalcitymazda.co.nz/mazda-reveals-mazda-mx-30-e-skyactiv-r-ev-in-europe
THE ROTANG PLANE. i'd definitely want a bridgeport. sitting on the apron at NZPP doing run ups:
BRAAP BRAAP BRAAAAAAAAAP BRAAAAAAAAAAAP