Determining the correct waterline turned out to be quite tricky, the more so as I had to provide my friend Frank Ilse with the correct information to design the decals - many thanks, Frank!
The 1:285 HH-52 / S-62 helo was converted from an Airfix 1:350 S-61. Luckily, the PE rotors for the kit´s S-55 fit. They were also used on the S-62, so my Franken-helo must scale out somewhere in the ballpark after all.