Hi Ray - I was going to answer your Q on IW BUT - I usually mark the center of the hole at 3/8" to 7/16". Maybe some say a tad low BUT with the Speedmaster stinger I can play with the strut angle to keep the prop happy, the ride attitude correct for racewater, and ride out the chine walk when it happens .
Edit : when you think about it, the real measurement (and what it affects) is the prop depth. I've found that the Cyberstorms are quite competitive in P-Mono with a 1515 1Y- type 2200 KV motor and a prop no bigger than 45mm like a M545. A higher shaft with a 47mm+ prop starts some torque roll issues which can settle into chine walk.
Of course I'm open to other input.
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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