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Pathfinder 15t Prop help


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I recently bought a Pathfinder 15t with a Yamaha F40.  It's currently propped with a Powertech SCB3 13pitch.  I'm only making 4800rpm's WOT at 27mph.  It is painfully slow to get on plane.  Probably around 9 seconds.  I have Lenco trim tabs on it and I'm trimmed all the way down to get on plane.  I can only come up about 2/3's on trim before it starts to porpoise.  I spoke with Powertech and they came up with some suggestions, but my prop guy doesn't agree and made another suggestion.  How were these boats propped from the factory in 1999, and what are people running today that seem to work?  Thanks

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