Engineering:HERC JOV-3
From HandWiki
The HERC JOV-3 was a two-seat tandem helicopter originally designed by Drago Jovanovich at the Helicopter Engineering Research Corporation (HERC). The helicopter first flew in 1948.[1] When McCulloch Aircraft Corporation purchased HERC they improved the design for prospective military use and it became the McCulloch MC-4.
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