74’ Seacraft 23 CC Rebuild

[Capt Terry]

Glosta23-
Upon my return home I examined your cg calculation. Your use of my method and calculations appear correct. And recognizing in the CSC-world there are different opinions here are some comments:
1-Although your predicted 1.2’ cg shift aft may seem negligible, you may want to consider other ways to shift or reduce it. Bushwacker after his ETEC 150 was mounted on a Hermco bracket had to move his trailer axle 11.5” aft to maintain the original tongue weight. In addition it adversely increased his minimum plane speed from about 13 to 17-18 mph (don’t remember the exact numbers), He has plenty of posts describing the pros and cons of brackets.

2-KNZ911 mentioned it took 300# in the bow locker to balance out twin 150s. Plugging 300# and 21’ from transom in the calculation would put your cg right back where it was originally.

Best wishes and enjoy your project