I have a 38' Commercial Gillnetter,(Sternpicker style) built by Mel Martin in '75 and you've all seen some of these around as they are all over the state. Mine is 38' after a 4ft extension on the stern but most are 32-34'
Doing Prop Calculation work I can't figure what they would call this Hull, Planing, Semi-displacement, Fast Semi-displacement, etc.???
It'll do 17.5 knots at WOT, has a 400hp Cummins 6CTA 8.3 which may just "Force it" up on step but it does just get up there at say 2200rpms, Max is 2600rpm.
I'll try to get some pics of the boat out of water if nobody knows what I'm referring to but I really need to get a feel for what this would be considered. I run it at Displacement speeds/rpms all the time as the fuel burn is outrageous on step but I can't get prop guys to not see the engine size, length, and reduction gear/prop info without trying to tell me I need More and Faster,
I'm hoping to reprop it for traveling at 10-12 knots more efficiently but not sure how to figure it out
Any prop calc guys on here, Please PM me if you think you can help with this idea, Pics of hull coming shortly