This phenomenon was first stated by the physicist Bernoulli, who said that in a moving fluid, velocity and pressure are inversely proportional.
This law, which is exploited in the nautical sailing world to move quickly at sea, should be minimised in garden sails.If a sail is not properly tensioned, this effect will swell the belly of the sail, making it very dangerous.
Maanta sails are of nautical design and their installation must be done in a manner directly opposed to the design of boat sails. While in sailing it is necessary to harness the wind to move forward, we must minimise this force (the 'lift') to enable the sail to be stable and safe.
Saill and Solaria, Maanta's Made in Italy sails, can minimise this effect thanks to the adjustable straps (see instructions on how to tension the shade sail) which are used to tension the sail and flatten the belly (called 'sail fat' in nautical jargon).
The more tensioned our sail, the less lift effect it gets.
Saill and Solaria are the only shade sails on the market that can withstand the wind effect on the sail.