Boat Trim
Posted: Sat Sep 28, 2019 8:46 am
How much does your stern drop when under power? I constantly search for ways to improve boat speed (maybe that is because I am an ex-power boat owner), but we don't ever seem to be able to achieve the speed that most people on this forum talk about whether under power or under sail. I have began to notice that our stern lowers into the water significantly when under power. Given the squared off transom of the C350, that can't possibly do anything but increase drag and lower speed. At 2400 RPM we typically can achieve 5 to 5.5 knots with a recently cleaned bottom whereas the typical discussion on this forum is around 6. The only time we get 6 knots or more is when we have a helping tide or breeze. I have converted the aft berth into the 'aft garage' and there are a lot of tools, spares, toys (inflatable kayak, roll-up dinghy, etc.) stored there, but others have dinghies stored on davits even further aft than what we have. We generally keep the aft tank empty to reduce weight aft. I wonder if I need to move some of that stuff forward under the forward berth. Or possibly it is simply a matter of the keel wing or prop shaft angle that creates the effect. We have the standard "M" series prop (newer wide blade). Our stern drops almost 4 inches when under power, what is 'normal' for a C350?