There is a tunnel that almost runs full length
As Ron notes there is a lot of lift in this hull
In the link Pic # 38 is a shot of the bottom to clarify what Stupidbaker57 describes
http://www.boatsport.org/PDF/BenHur5.TextMark.pdf
Here is a profile of the hull that shows the S curve
http://www.boatsport.org/PDF/BenHur1.TextMark.pdf
You might find a shaft angle of about 8 to 10 degrees down will cause to much lift at the rear and plow the sponsons with this cabover design..So you need design flexibility for the shaft angle to change to something less than 8 to 10.
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