Thanks a lot for your email, and please accept my sincere apologies for the late reply. For some reason or other, I forgot to highlight your email for a response, and I've only just re-discovered it!
Flint was designed as a rowing boat capable of taking a very small outboard motor i.e. the hull is optimised to be easily driven at displacement speeds. One of the primary requirements was for her to cut through a short, steep chop with minimum pounding.
|Eddie Guy's Flint, built to replace a flat-bottomed boat which pounded too much, and was difficult to keep on course|
It is common for passengers to sit too far aft in small boats, particularly when using an outboard, so I deliberately desinged Flint with quite wide sections aft, but only above the waterline. Therefore, when trimmed properly she is effectively a double-ender, but if someone moves too far aft, the wide sections pick up buoyancy quickly.
|Note the wide aft sections on Bill Bronaugh's Flint|
|Alec Morgan's polytarp Crab Claw rig - it works very well!|
|Steve Dorrington doing 6.3 knots on 2.5 Seagull horsepower!|
|6.1 knots with a 2hp Yamaha, and a heavy load|
Similarly, the sails have been located so that the daggerboard case can be positioned in front of the main rowing thwart. This means that retro-fitting an existing boat only requires the cutting of a slot in the bottom of the boat, without chopping into other parts of the structure.
I haven't had any reports regarding the sailing performance of this rig, because to my knowledge, none have been tested. However, my feeling is that the boat would sail very well indeed.
As for your question about a simple lugsail option, I am very keen to have a look at the figures, but I suspect that it may be necessary to cut a hole in the buoyancy tank to instal a mast step and partner. I've got a lot on at the moment, but I'll try to get something done as soon as I can. Please give me a nudge if you don't hear from me in a reasonable time!
I hope this helps a bit,