Originally Posted by
SplineDrive
I don’t know what the UH-60 yaw rate in a hover is, but I recall a design requirement of 15 deg/s yaw in a 35 knot wind, so perhaps it’s 20-some odd deg/s in a no wind hover.
It might be higher than that, or you might have nailed it.
For the CH-60S (which was based on the UH-60L) I find this limitation in an old NATOPS manual: Paragraph 4.5.6 (Prohibited Maneuvers) includes
Hovering turns at a rate in excess of 30° per second.
(TBH, that rings a bell in my memory from SH-60B days, less than 30° per sec for pedal turns, but that's been more than a couple of decades so I'm not gonna put any money on that).
Guessing the design spec was in that ball park, but they reduced the permitted envelope (as with ship landing envelopes) for normal operations.