Thought some might find this interesting. Here are Some pics of an airboat that does treatments to the lake my in laws live on. This is a 450hp LS based 6.0, the company offers a 525hp 7.4 454ci and also a 600hp 6.2 LS based boat. This boat was quieter than the old 350 sbc since that one ran through open headers. The prop is huge and made of carbon fiber. Boat doesn’t weigh much but when they spray it has a 250 gallon tank filled with whatever chemicals which really weighs it down. I couldn’t see an oil tank but I’m thinking this is a dry sump
Levitator airboats