Return to Sail Loft Courtesy of Doyle Sailmakers Rig Terms I Deck to mast length - distance from the deck to the intersection of the forestay and and mast. J Forestay to mast length - distance from the forestay at the deck to the mast at the deck. P Main mast length - distance from the top of the main boom to the black band at the top of the main mast. E Main boom length - distance from the back side of the main mast to the black band at the end of the main boom. PY Mizzen mast length - distance from the top of the mizzen boom to the black band at the top of the mizzen mast. EY Mizzen boom length - distance from the back side of the mizzen mast to the black band at the end of the mizzen boom.