A couple things that Cliff said I don't understand. One is that you can paddle closer to your keel line with a bent.
That one had me scratching my head too.
I missed this CJ comment, which does sound strange, so I went back to reread it. Here's what CJ says:
"Even your precious
J stroke is best done bent. Why? Because the bent blade runs partly under the canoe during the stroke, whereas a straight blade runs alongside. It is a canoeing axiom that the closer to the keel line you paddle, the less directional correction is needed."
He's talking here specifically about the J stroke. I think he means that as you twist your grip thumb down for the J, the bent blade will angle (or point) partly under the hull and not just alongside the hull like a straight blade. Hence, the bottom tip of the bent blade will be closer to the keel than the bottom tip of a straight blade upon completion of the J twist.
The problem I see with this argument is that once the J twist is completed, the paddle is no longer being drawn back to propel the canoe forward. So, I'm not sure that that being a bit closer to the keel during the short "J twist time" significantly affects the directional yaw of the forward stroke with a bent shaft paddle.
The positional angle of the bent shaft blade upon completion of the J twist does explain, however, why J correction is weaker with a bent than a straight paddle. After the J twist is completed, the paddler finishes off the J stroke by prying away from the canoe to make the correction. The angle of the bent blade, pointing partly under the hull, provides less surface area for the outward pry than the angle of the straight blade, which is more parallel to the hull.
But, contrary to a racer seeking every microscopic speed advantage, this is all sort of peanuts to a competent recreational paddler, who can propel and control a canoe just fine with either a bent or straight shaft paddle. Personally, I firmly prefer a short bent shaft for recreational forward paddling on flat water. There are several efficiencies in my experience.