Anybody knows the percent of pilots in Japan flying electric in a typical contest?

Yes, IBM and US government labs are working on lithium air battery and and the energy density theorized is 1000 times more of what we have. If it plays out, e-powered plane can be in air for much longer, and we may not need multiple packs!

Little bit off the topic but I would assume YS is also watching the development in e-power segment?