>>1169655If by "viable" you mean carrying 2 guys for 30 minutes at 80 knots, then sure. Anything more that that requires a giant, unforeseen leap in tech or materials science. Hybrid, biofuel, hydrogen, are all WAY more "ready for prime time" than electric batteries right now, or anytime soon. Heck, solar-powered gliders can stay up hours longer right now, but you're sure not gonna start an airline with them.