LIGHTNING M-5 MAINSAIL Color:White the M-5 main is designed

the M-5 main is designed based on a tuning system which enables your team to "change gears" based on wind conditions and your sailing style by adjusting mast blocks and lowers tuning

this sail is a must

It is designed for easy setup with one mast butt position

The Magnum Mainsail is all-purpose sail

LIGHTNING M-5 MAINSAIL Color:White the M-5 main is designedPossibly the winningest mainsail in the history of the Lightning Class, the M 5 main is designed based on a tuning system which enables your team to "change gears" based on wind conditions and your sailing style by adjusting mast blocks and lowers tuning. The M5 setup allows more use of the backstay to control mainsail shape and headstay sag. Your rig can be set at a "base" setting for all purpose racing while also allowing tuning changes (between