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Vought-Sikorsky VS-300 helicopter in tethered flight, USA, 1939
(lemmynsfw.com)
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this post was submitted on 10 May 2025
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It seems a bit odd. The main rotor imparts an opposite spin on the body. Tha tail rotor is there to counteract that spin by blowing sideways. A horizontal one would have to use just its spin, not getting the benefit of the air mass being pushed sideways.
That (chinook-style solution) only works if both rotors are the same size and speed.
Perhaps Sikorsky's tethers to the ground worked around the problem for that photo anyway. Not sure.