Thanks for all of the suggestions. I have more research to do on some of your suggestions.
Right now, I have a windmill built out of the hard plastic from a luggage case that is mounted on a bike frame (recovered from the cargo hold). The bike gives me 10:1 ratio so that I can drive some motor/alternator to get power down to some electronics (PSU?) that can charge the three 28V DC batteries that are on a 777 (at least I know of 3).