This system is representative of what could be used on a high-performance multihull. Given the extreme loads involved in taming big square top mainsails, and the righting moment generated by high-volume floats with foils, it would be preferable to contact your local Ronstan Representative to discuss your options before proceeding. The image shows RF69109A blocks however RF69109 may be suitable.
MWL = 1800kg (3970 lb)
Max Line Size = 12mm (1/2")