Check out this sight:

http://www.paddles.com/library/straight.html

> My G has been seaworthy for 2 weeks now, and I've had it out in high wind,
> variable wind and no wind at all. It weathercocks in any puff of breeze.
> It also has some interesting turning habits. It seems to rotate around a
> point about 4 feet behind the bow, and about 20 feet abeam the boat. Once
> the turn begins, it feels like the bow tracks but the stern
> "skids". It feels like a car oversteering, with the radius of
> the turn decreasing and the back end all hung out. It doesn't seem to
> matter much whether it's a flat turn or a carved one. Is this common? It
> seems like this could be a real problem in following seas or when surfing.
> It's hard to carry any speed when every second or third stoke has to be a
> sweep. Intuition says it needs a skeg, but I'd like to hear from other G
> paddlers before chopping holes in the hull. TIA, Pete.