MRH90 and Ships
The MRH90 fits into the hangars on the ANZACs, albeit encroaching on the margins around the aircraft (the S-70B-2 also encroached margins on the FFGs, but nobody worried about that for 20 odd years and it didn't prove to be an issue). Against much opposition a trial was conducted, the results were (unfortunately for many detractors) successful, and kept fairly quiet. Not quite sure of the Air Warfare Destroyers, but it may well fit there also. Won't fit in the FFGs.
Merlins are much, much bigger.