Citations
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Patent
Paddle blade end with sidewalls form eccentric shaft
TL;DR: A foldable paddle blade and shaft comprises a planar elongate polymer plastic substrate with two angularly directioned weakened hinge lines which extend inwardly and angularly from a location at or near one elongate end of the substrate's lateral edges to form a blade with sidewalls and a free terminal end as discussed by the authors.
References
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Patent
One-handed paddle
TL;DR: In this paper, a one-handed paddle having a blade, a hand-grip and an arm brace portion was used to control a single-handed hand-held paddle.
Patent
Paddles for boats
TL;DR: In this article, a plastic paddle of unitary construction defining a hand grip with a wrist engageable portion at one end, and a blade portion at the opposite end, which blade has a tapered cross sectional shape with flanges defined along its marginal edges to achieve maximum strength from a minimum material, and the paddle material itself being formed of plastic to a uniform thickness for economy in manufacture.
Patent
Vanes for abrasive blasting wheels
TL;DR: In this paper, a blasting wheel is provided with vanes having a relatively concave face to project abrasive particles in a narrow pattern, and the vanes are equipped with a small diameter.
Patent
Reduced drag paddle for kayak - has concave profile plus longitudinal ribs and grooves for stability
TL;DR: The paddle head has a convex outer profile reinforced by ribs running axially, with a large middle rib (4) and shallower outer ribs as discussed by the authors, and the ends of the ribs are tapered into the paddle profile.