Rick,
I too found that the UL-1 / SV27 rudder with a built-in pickup was a direct bolt-on replacement BUT the pickup was rather high up in the blade. I lowered the pickup (a fairly tricky job) but ended up bolting on a spare Speedmaster rudder with an enlarged orifice I had laying around.
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With some scraps laying around, I made a simple propwash pickup which works great
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Keep in mind that watercooling, while nice to have, won't cure an overstressed setup. Stay in the "safe zone" and enjoy the MC ; it's a great boat
2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono
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