Paddle convex and concave sides and forward propulsion

In summary, the correct way to use a paddle for stand up paddle boarding is to have the convex side facing rearward and for kayaking, the concave side is used instead. This is due to the fact that the convex side generates a lift force when moving backward, while the concave side would seem to scoop more water. This difference in paddle usage is also related to the concept of cavitation.
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fog37
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Hello everyone,

In stand up paddle boarding, the correct way to use the paddle when moving forward is to have the paddle convex side facing rearward while the paddle pushes water backward. This is explained by the fact that the paddle generates a lift force pointing backward if the convex side of the paddle is moving backward. The beginner would think that the concave side would have to face backward instead since it would seem to scoop more water..

In kayaking, I think the kayaker uses the paddle with the concave side of the paddle facing backward instead...Why?

Thanks,
 
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1. What is the difference between the convex and concave sides of a paddle?

The convex side of a paddle is the outwardly curved side, while the concave side is the inwardly curved side. The convex side is typically used for forward propulsion, while the concave side is used for steering and stability.

2. How does the shape of a paddle affect its forward propulsion?

The shape of a paddle, specifically the convex side, is designed to provide maximum surface area for pushing against the water, resulting in more efficient forward propulsion. The curvature of the convex side also helps to create a smooth and continuous flow of water, reducing drag and increasing speed.

3. What is the ideal shape for a paddle's convex side?

The ideal shape for a paddle's convex side depends on various factors such as the type of water and paddling technique. However, a general rule is that the convex side should have a gradual curve and not be too sharp, as this can cause excessive drag and decrease forward propulsion.

4. Can a paddle's concave side also contribute to forward propulsion?

While the concave side is primarily used for steering and stability, it can also contribute to forward propulsion. The inward curve of the concave side creates a pocket of water that can be used to push against, providing additional power and speed.

5. How can I improve my forward propulsion with a paddle?

To improve your forward propulsion with a paddle, you can focus on using the convex side efficiently by maintaining a smooth and continuous motion, keeping the paddle angled correctly, and using your core muscles for power. Additionally, practicing proper paddling techniques and choosing the right paddle for your needs can also improve your forward propulsion.

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