Conrad: What does your 42 NT cruise at. (Max cruise--not WOT.) There's a 42 down here in San Diego and it's a beauty!
Hi Walt; still getting her sorted out. (Only owned her 2 weeks)
She has a 350 HP Lugger for starters, whereas many have much higher HP.
But so far I can report that the PO cruised at 1600 RPM at 8.3 knots, using about 3 GPH. The delivery crew that brought the NT up to Campbell River ran at 2200 RPM at 10 knots using about 8 GPH.
On our recent maiden voyage we discovered a shimmy at 1600 - 1800 RPM so ran at 1500 RPM giving us 8.2 knots. The flow meter suggested we were using 2 GPH although I don't know how accurate that was.
During the sea trial she easily went up to 2600 RPM, her rated max, at just under 12 knots. That would suggest that she is slightly underpropped, but since we like the ~ 8 knot cruising range we won't touch the prop (unless it is the source of the shimmy) as we want to keep the engine running at 1500 RPM or higher.
Ours is actually hull #1 of the NT42 series, and we love it!
(As an aside, using a delivery crew was not a luxury; in fact it saved us many thousands of dollars as they left Canadian waters for a few minutes, allowing us to take ownership in international waters which as Alberta residents saved us the cost of the BC sales tax.)