Spinouts: Why They Happen and How to Stop Them

Discipline

Windsurf

The tail slides away and you're suddenly sailing sideways. That's a spinout — and it comes down to pushing too hard against the fin. Here's the physics, the gear and the technique to stop it.

Your board is planing and the tail suddenly slides away, leaving you almost sailing sideways over the water. That's a spinout. In simple terms, you're pushing too hard against your fin — the sideways force gets so big that the smooth flow of water over the fin breaks down. Here's the physics behind it, plus the gear and technique to stop it.

Step by step

1
Understand the fin's physics
A windsurfing fin works like a small wing. You're moving forward and sideways at the same time, so the water meets the fin at an angle. Push too hard and the sideways force grows so large that the water flow can't stick to the fin's surface — it separates, and you spin out.
2
Tune your gear
The thicker the profile and the more area a fin has, the more lift it creates — and the harder you have to push before it lets go. If your fin is too small for the board, or your tail is too wide for the fin, spinouts get more likely. Keep the fin clean too: scratches and dirt disrupt the flow, and a clean surface is often the simple fix. On the sail, spinouts often happen when the power point sits too low and too far back — a touch more outhaul releases pressure off your backhand and back foot.
3
Fix your technique
At higher speeds, don't trim the nose too high — lift it too much and less of the fin stays in the water, so it makes less lift. And in the early planing phase we tend to overload the fin: keep your back foot in front of your back strap until you reach a speed that lets the fin generate enough lift.