Have the mast out of my 37c. Extrusion was 52'-10" My understandiing of above water ht is 50' for this boat. Mast base was about 1-3" below cabin sole, and I know sole is below waterline a foot or so. I am comfortable with 50 above WL. there is about 6-3 headroom in the cabin at the mast, and with a couple of inches for deck thickness, height above deck may be 46'-47'. " "P" dimension from boom to top of main is 45'. Hope this helps clarify.