Fletcher FU-24, how loud?

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Take a guess at how loud this full-sized crop duster is at 50 meters?
The FU-24 950m is powered by an 8-cylinder horizontally opposed Lycoming O-720 engine producing 400 horsepower and a *lot* of prop noise.
I caught this footage today at the Tokoroa Airfield (28 Oct 2016)
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