Crab, correct on all counts.
I think we now need to forget the Sycamore, even I can't remember seeing one airborne. I recall RAF teaching was 30kts & 300 ft/min for the Whirlwind; that type used to be taken up to 10,000 ft on the basic course (pilots wearing parachutes) to demo it, the climb taking most of the sortie. I was never convinced by the demo I saw; I must have blinked and missed it.
The later inadvertent developed VRS in the Puma over Forkhill after a long night hovering at Flight Level Nosebeed was much more interesting....
)
Chalk and cheese for a decent modern helicopter. Even the little R-22 has a relatively high disc loading.