I'm really trying to learn more about airboat design. I've built a couple airboats by simply parking completed paraflyers on flat bottom hulls. Best performance with a 21hp single cyl Briggs was 20mph with a 170lb 'driver', it never did really plane in deep water. It was a fun project but I earn my living with flying stuff and I had to move on.
here is one such video
https://www.youtube.com/watch?v=iXrTCzbK3Sc
Terry
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