Man! Was that meant to imitate a Blériot XI? Good job to the girls!

But why are they dressed as Tengu?

Doesn't look like they are Hiei and Haruna, removing tags. A translation might help identify them.

They are Ibuki-class Ibuki and Kurama battlecruisers.

In a reply he points out the progress of military aviation over the years through his drawings.

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• Wikipedia: Grade monoplane
• THE EARLY BIRDS OF AVIATION, Inc.: Kumazō Hino