Sheet in as you go faster?

I going faster, but feel out of control! "Sheet in!" the instructor cried.

It sounds odd that the faster you go the more you need to sheet in.

But it’s because the wind you’re sailing too is as much a component of you moving forward as the true wind itself. Check out this awesome video from the America’s Cup teams on apparent wind.

We need to do this a lot in windsurfing, but check out how extreme it gets when foiling.

The clip below is short foil clip going deep downwind, but look how sheeted in the sail is,

So don’t forget, for more control the faster you go sheet in more.