Good news. The lighter V8 version is running and turning well with the 1515-1Y motor. The CG is at the front edge of the turn fin (this is key!!). It also took 6oz of weight (placed at the CG) to keep it down in race water. Speeds are 62-65mph.
Recall that I gave up on the big motor because it was just too fast. In order to keep it down as speeds approached 70mph, it would have required much more weight at the CG. The hull was at it's speed limitations IMO. Rather than just add more weight at the CG to keep it down, I'm trying to kill some more lift to increase the speed potential. On this experimental boat, I am reducing the AOA of the kick-up at the bottom. Some previous experiments with an air dam showed the boat to be much more predictable as it gave warning prior to a blow over (floated, rather than just snapped over).
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