[quote=Dogboy]I raced a H20 for several years in the '90s and early 2000's.
I would recommend you run the boat more or less stock. Mostly what is being shown in those pics are cascading downhaul systems. Basically what a cascading downhaul does is eliminate a couple blocks from the system so you have less friction. The H20 class rules allow for an 8:1 downhaul system. The stock system just had a quad block at the tack of the sail and then used the cleats and blocks in the mast base, so you had 8 "throws" of the downhaul line. A cascading system basically takes a 4:1 system and ties a 2:1 system onto it, so you have 4x2=8:1 and you eliminate one or two throws of the line. The problem with the cascading system is that it requires twice as much vertical space on the mast, so you either have to run the adjustment line several feet up the mast or you have to add extra cleats so you can change the position of the adjusting blocks so they don't bottom out. Again, go with the stock system for now, if you get serious about racing see what other folks are doing.
Moving the mast rotation bar above the boom is a personal preference. Adding a positive mast rotation/bungee system is pretty standard for racing since it allows for full rotation downwind. For pleasure sailing, I wouldn't bother with it.
As for the other mods in the pics, one looks like the barber hauler blocks were re-located. This is probably not class legal. The other looks like some multiple purchase on the jib halyard or a remote jib halyard adjustment and this also would not be class legal.
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