They look too short and wide for helicopter blades.
Drifting back to how the RAF won the Battle of Britian, I watched documentaries on the first world and Battle of Britain and they said exactly the same thing about both conflicts.
"We would fly sorties all day and might lose 5 or 6 aircraft, by the morning of the next day there would 5 or 6 replacement aircraft on the airstrip."
Manufacturing capacity was significant factor
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