http://en.wikipedia.org/wiki/Japanes...er_Akitsu_Maru
Deployed acft.:
http://en.wikipedia.org/wiki/Kokusai_Ki-76
http://en.wikipedia.org/wiki/Kayaba_Ka-1
Video of 'gyro flight tests:
https://www.youtube.com/watch?v=_EFt7cLCRSY , particularly from 5:00 onward.
Won't see many of these out there. :)
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