Porpoising not on purpose

CABINDOC · 05-04-10, 08:44 PM

I have a porpoising problem and was wondering if anyone out there has any insight.
The problem: Porpoising before getting to the sweet spot while trimming @ speed.
The boat: 93 Hydra-Sports 170 fs. 17’ fish/sk.
The motor: Johnson 90 2 stroke runs well as far as I can tell based on my observations, WOT and speed
The prop: I have tried 3 and 4 blade, right now; prop is good based on speed/RPM @ WOT and the way it gets up on plane.

The load. I have tried it alone and with max capacity. I have tried shifting all the people forward of the wind screen to see if I could get there before the porpoise showed up, no luck. Has room for 2 trolling motor batteries in the rear bilge, I don’t have them in right now. Tank is ½ full and I have been running with the live well empty.

Is this a design flaw with these boats? I have only had it for 2 years and it has always done it.

05-04-10, 08:44 PM	#1
CABINDOC BassFishin.Com Member Join Date: May 2010 Location: New Egypt, NJ Posts: 18	Porpoising not on purpose I have a porpoising problem and was wondering if anyone out there has any insight. The problem: Porpoising before getting to the sweet spot while trimming @ speed. The boat: 93 Hydra-Sports 170 fs. 17’ fish/sk. The motor: Johnson 90 2 stroke runs well as far as I can tell based on my observations, WOT and speed The prop: I have tried 3 and 4 blade, right now; prop is good based on speed/RPM @ WOT and the way it gets up on plane. The load. I have tried it alone and with max capacity. I have tried shifting all the people forward of the wind screen to see if I could get there before the porpoise showed up, no luck. Has room for 2 trolling motor batteries in the rear bilge, I don’t have them in right now. Tank is ½ full and I have been running with the live well empty. Is this a design flaw with these boats? I have only had it for 2 years and it has always done it.

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