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Just a follow up about this recent 2014 Yamaha F70 'prop-rash'.

I haven't done anything to dress the edges yet, but I did get in a few hours of run time in varoius conditions and could not feel or hear anything different.

On flat bay water up on 12 mph plane in 4 seconds.

On open ocean, 2-3 swell, 1' chop, 8-10 mph breeze:
3200 rpm = 16 mph
4000 rpm = 21 mph

Speeds from Speedo app on cell phone, but no difference from before 'prop-rash'.

Going to dress prop edge this week and raise engine all the way up from 2nd from bottom to bottom hole of bracket.
After the engine raise and more test runs, I'll look into the stainless prop and likely the Flo-Torq II hub conversion.