Re: Oday 240 (wing keel) vs Oday 25 (cb shoal)
Enjoy! I have great memories of camping on Lake Sakakawea as a kid. I imagine it would be great for sailing. A couple hundred miles long, ten miles wide, windy, and you'll have it almost all to yourself.
One word of warning, the lake can have quite a strong seiche effect where the water level is higher on the downwind side of the lake and lower on the upwind side. I remember having to move the tent one night when the wind shifted and the water level came up by over a foot and started flooding our campsite.
What this means to sailors is that on the other side of the lake the water probably dropped a foot, so if you had anchored in shallow water you might now be aground.
Anyway, get a boat and come back here to post stories! I would love to hear some adventures sailing on Lake Sakakawea.
(Also, I dig the 701 in your handle)