I will be looking at max hp 2 stroke weight that was originally recommended for the boat.
Once you find the center of gravity of a boat, you are supposed to be able to measure out foot lbs of weight of downward force on the boat as the weight moves away from the center if gravity of the boat. I plan on trying to figure out the most weighty objects in the boat and try to see what the weight distribution looks like.
Taking that info, I will then mock the weights of the new engine I am wanting to use and how I want to set my boat up and see what my weight distribution would look like and see how it relates to the original design set up. I can then move weight around in the boat to try to get as close as I can to what the weight distribution design was originally.
If you look at the two different spec sheets... One on the SF 20 and one on the Seafari 20, you will notice that the fuel tank is in two different spots. I don't believe this is due to the center of gravity changing because the center of gravity of the hull shouldn't change. The SF20 has a more open bow and is lighter in the front end so the fuel tank appears to be positioned near center of the boat. The Seafari 20 on the other hand has a more heavier front end due to the cabin and thus if you see to where the fuel tank is located it is located more off center towards the stern of the boat. Also of note was the use of a more lighter capacity fuel tank at 38 gallons. Again, I do not believe the center of gravity of these boats change.... Rather it's more of a changing of weight distribution around the center of gravity.
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