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Antonov An-2MS nine-engine biplane - video and photo
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Any idea what powered the small props? It looks like it could be electric motors, but this plane was from the mid-60s. Being a Soviet creation, it may well have had a shaft running off the turboprop engine going to a sprocket(s) and chain(s) setup to drive the smaller propellers. Maybe, a generator running off the turbine or an APU?
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Looks like it was some sort of demonstrator or test bed, this says that the small props are driven by electric motors:
https://sustainableskies.org/nine-en...s-dep-antonov/