Mental thoughts........ and perhaps contradicting part of my last post. What is exactly happening with a doel-fin?
Correct me if I'm wrong, but when we trim out we are pushing the force of the prop in an upward angle away from the boat. That has the effect of raising the nose, (or lowering the stern slightly). Now the oncoming rush of water will hit the hull further down the length of the boat, thus making the whole boat rise further out of the water on the plane. Less boat in the water, less drag, faster speed etc. As the speed increases and if we get the trim right and the boat is balanced, we should get level again and be an inch or two higher and happy.
So, how is the doel-fin helping? Is it causing more downward force to make the bow rise at the start of the sequence, or does it help to put the boat back onto a level plane by upward force when maximum speed is reached? Or both? Or neither? Got me thinking now!
Any Hydrodynamics experts out there?