In article , Wyatt Emmerich
wrote:

Anybody had any experience with the Turbo Alternator? It is a wind-driven
fan, about 7 pounds, which drops down from your wind in the event of an
electrical failure. It puts out about 15-20 amps--enough to drive all your
instruments.

I would love to have one for my Champ, but at $500, I cannot justify it.