Hydrophobic Projectiles Slice Through Water With No Drag

Summary by Krater

This video explains how a projectile with a superhydrophobic surface and a layer of entrained air reduces drag in water, achieving a drag coefficient 10 times lower than a solid shape.

From the video

Answers: How does a superhydrophobic projectile reduce drag in water?

• No-slip condition in fluid dynamics
• Superhydrophobic surfaces
• Leidenfrost effect
• Drag coefficient of projectiles
• Entrained air bubbles in water

What it concludes

• A superhydrophobic projectile with entrained air around it hits the bottom of the water 33% faster than a non-hydrophobic ball.
• The total drag coefficient of a shape with an air pocket is 10 times lower than that of a solid shape through the same liquid, measuring around 0.02 or 0.03.