Confirming Glosta23 CG calcs
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 (dont 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
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