VIDEO: North Sails Tech Talk – Upwind Speed Booster with Charlie Cumbley & Cyclops Marine

With the help of smarttune load sensors from Cyclops Marine, North Sails One Design Expert, and J/70 World Champion Charlie Cumbley explains how the dynamic balance of upwind performance hinges on forestay load.

Find the smarttune for your boat: or enquire at:

Get in touch with Charlie at for any sail-related enquiries or questions.