For maximum power when sailing deep, loosen the boom or sprit to create a deeper sail curve.
Use telltales on both sides of the sail; ideally, they should be parallel and flowing backward to confirm laminar flow. Preparing For The Storm : How to Lie A-hull For maximum power when sailing deep, loosen the
Achieving a "deep" sail shape is about maximizing the lift-to-drag ratio and harnessing kinetic energy from the wind. For maximum power when sailing deep