Take a look at this video – UK National Champs 2005 Lightweight mens quads
The leading Tideway Scullers crew is using Dreher Rounds…. very little splash at catch or finish. Blade holds its depth through the stroke.
Now take a look at the Peterborough City crew (Blue/Yellow oars) as they come up into frame at 40 seconds. All their oars corrugate and wash out.
What’s your experience? Which oar designs do you use? Do they hold the water at race pace?