Originally Posted by
Conquistador_del_mar
I'm sure it is a matter of how these k planes are made because the leading edge is about 1" above the bottom of the hull.
The transom angles were the same on every boat they built. The tabs that Keith put on that boat, while cool looking, are a complete misfit for that hull and the waters it ran in. Merc made a family of K-planes that are 12" long if I remember correctly. Find a used set and have a plug and play replacement. Now as to how your current tabs are mounted, I think there was a miscue there as well. Why on a fast, short hull would you mount the leading edge of the trim tab a full 1" above the hulls horizontal running surface? I would have thought 1/4" max.
The other thing to consider is the depth of the drive which effects leverage, what is that prop shaft depth on your 23?
1972 16 OB - C16B-63 - "Surface Tension" Resto Project
1974 16 OB - DMR16106017-B - "The Mule"