PTWoody said...
I like to think it's different strokes for different folks. Seriously. You can't apply the same assumption to everybody.
This.
Just to illustrate, I have three sizes of Ke Nalu paddle, all with the same comfortable shaft length. I'm not fast or competitive in race terms but I had the impression that I was going faster with the little one at high cadence. I have lately been testing this by timing myself with the different sizes over short and middle distances (same board and and fin, in a range of conditions). So far I'm finding I'm slower with the smallest blade at high cadence by about 30-40 sec/km compared to the mid-size. Over a 6k course that's as much as 3-4 minutes. Between the medium and big - seems over short distances up to about 5k I'm quicker with the biggest blade by about 10-15sec per km, longer runs the mid-size has the edge but that's probably more to do with my lack of fitness. I'm tallish and have a
lot more body mass to move than most. Light/lean/short paddlers would probably find different.