Engine/tranny combo? Prop type/brand?
Same thing here. I have removed the cockpit floor to check that the engine (Yanmar 3HM35F) is not moving aft on its soft mounts, but I saw nothing interesting. I thought about going over the side to see what was going on in the water, but it seemed likely to be one of those, "Honey, hold my beer and watch this." ideas.Yes! Kenlanu makes exactly the same (and quite disconcerting) noises. The faster you are going forward the more the noise and the greater the "What the bleeep?!?!?!" As others have noted, going into reverse when standing still produces none of these noises so it has be to something to do with turbulance, cavitation, or special gremlins that came with our boats, take your pick.