: Back in the late 50's two friends and I built a flat bottom boat to take on a
: Canadian fishing trip. Coming out of a quiet bay we got into huge waves on
: the main lake and could turn back for fear of being broad sided and
: capsizing, So we headed strait for the other side of the lake. Water kept
: splashing into the boat to the point that the water would rush from one
: side of the flat bottom almost tipping the boat, then we would adjust our
: weight and the water would run to the other side. We were in trouble and I
: started to take my boots and clothes off for swimming. About 30 feet from
: the other shore we capsized but were able to pull the boat to shore and
: get our gear. With a v bottom or a round bottom the water would center in
: the middle of the boat. No way would I have a flat bottom kayak.

: John

Hi John,
I think the phrase is free-surface, the amount of space without any interuption. A flat-bottomed canoe could have a considerable amount of free-surface compared to a similar shaped kayak. Also, in a kayak, the kayakers legs act as baffles in lateral water movement.
Of course, a spraydeck would minimise any water ingress, and in a canoe, a bailer scoop does help.

I still prefer a kayak, or boat, that has some vee or keel effect. I have gone for an accidental swim from a flat-bottomed punt when it literally slid out form under me. I was standing at the time. That learned me.
Another good reason to always wear a PFD in a boat or kayak.

Mike Savage
South West Cork