Hi,
English is not my native language, but do I well understand that you are not meaning a furling main sail? (Roller carrier).
The dimensions of my standard main sail Bav 38 2003 (not full battened) are P = 13,30 m (luff), E= 4,65 m (foot). These dimensiones will be the same for a full battened main. Not for a furling main.
Ger