I've got an SC-4 for my F70. It's a good compromise 4 blade with the jackplate on my Caimen. Not remotely as much grip as the RXB I run sometimes but enough for most situations and I'm able to run 2" more pitch than the RXB which gives me a little more top end and, more importantly, about 1.5 mpg better cruise economy at equal speeds due to running much less rpm for the same speed.
It's one pitch lower but the extra blade is allowing more bite from the tunnel wash. It's only a pocket tunnel but its very large and does shoot a lot of wash up into the prop.
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