Introduction
The document discusses the design challenges and innovations in creating sails for foiling International Moth dinghies, highlighting the involvement of Hyde Sails in collaboration with Paul Brotherton.

Design Specifications
The mainsail, coded as 2A, is priced at £595 excluding VAT. The sail's design focuses on weight reduction, crucial for a boat with a sailing weight of 30 kilos. The sail uses ODL 04, a 2.8oz Technora laminate, known for its lightness and stability.

Design Evolution
In 2007, a four-batten layout was used to save weight. However, in 2008, the design reverted to a five-batten layout to enhance sleeve rotation, ensuring smooth and easy gybing.

Performance Balance
A successful Moth sail design balances power and control. Power is essential for early flight, but once foiling, the apparent wind increases, necessitating a flatter and twisted top sail. The 2008 sail design is believed to have achieved this balance, as tested extensively by Mike in Hayling Bay.

Conclusion
Hyde Sails emphasizes continuous improvement and reserves the right to change specifications. The document underscores the importance of innovation and testing in sail design for foiling dinghies.