Art,
There was a boat in our yard that was much like a Tolly w ONE full keel. I may have a pic at home in the I-mac but not here. KK does that but keeps the keels as small as possible to (most likely) minimize drag.
Forget about planing if you do that. Probably too much drag. There will be "interplane drag" loss between the two keels but if you can overcome the drag w power the compression between the keels may give you some lift.
You'll have a lot of lateral surface aft from those keels and if they don't extend a long way fwd a bad lateral mismatch will result in a bow easily blown downwind so a big bow thruster could be in order.
Art if you want a keelboat why don't you buy one? Of course we all know the answer to that
Are you concerned about maneuvering in port or on big following seas? Or something else? Save your money Art or spend some on some powerful hydraulic thrusters. Maybe I'm reading you wrong and you just want a boat that's more of a trawler. Seems to me when you came on TF you wanted us to consider your Tolly to Be a trawler. We had quite a discussion on the matter as I recall. I loved my XK140 Jaguar roadster but I sold it and bought a Mercury cause the Merc filled my needs. Never got another Jaguar but I still think about the 140.
If this is serious stuff Art think it out and do/get what you want/need. Look for balance but we only live once. Once in a great while I think of selling Willy and buying a Bently. Choices choices choices. We can do what ever we want. But we've got to live w the results and usually that's fairly predictable if we can have a few moments of objectivity.
If I were you I'd probably do something very different. I'd curve the bottom of the aft part of the boat up to almost the WL and install two 40hp diesels. But the end result would still be a two GPH boat.
The easiest and smartest thing to do is to probably just run what you brung. Not to mention the cheapest. Heard that in car circles a long time ago.
