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Author Topic:   13' Sport Porpoising

cayocosta posted 07-18-2000 05:09 PM ET (US)
I've had a 1979 13' Sport with a late '80s Evinrude 28 hp for about 10 years. A problem that's plagued the boat is porpoising -- the bow goes up and down as if in a light chop even when the water's like glass. In addition, to get the boat to plane, you have to crawl in the bow to get the nose down.
For a couple of years we tried a wing on the cavitation plate, but it wound up cracking the cavitation plate. The wing seemed to help the boat plane easier, but it picked up a lot of the seagrass that floats on top of the water around here during the summer months.
I'd always wondered if it weren't just underpowered, but I see in ads people waterskiing behind a 13' Whaler with a 30 hp on it. I weigh about 180, and I'm usually with my two dogs, who total about another 110, and none of us are trying to waterski.
This can't be that complicated a problem, can it? Any suggestions?
DIVE 1 posted 07-18-2000 10:32 PM ET (US)
THE BOW NEEDS TO BE TRIMMED DOWN. IN WHICH HOLE IS THE PIN LOCATED FOR YOUR ENGINE TRIM? TRY MOVING THE PIN DOWN ONE HOLE AT A TIME(TOWARDS TRANSOM) AND THEN TEST RUN THE BOAT. IN CALM WATER YOU SHOULD BE ABLE TO RUN THE ENGINE AT FULL RPM WITH NO PORPOISING.

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Author	Topic: 13' Sport Porpoising
cayocosta	posted 07-18-2000 05:09 PM ET (US) I've had a 1979 13' Sport with a late '80s Evinrude 28 hp for about 10 years. A problem that's plagued the boat is porpoising -- the bow goes up and down as if in a light chop even when the water's like glass. In addition, to get the boat to plane, you have to crawl in the bow to get the nose down. For a couple of years we tried a wing on the cavitation plate, but it wound up cracking the cavitation plate. The wing seemed to help the boat plane easier, but it picked up a lot of the seagrass that floats on top of the water around here during the summer months. I'd always wondered if it weren't just underpowered, but I see in ads people waterskiing behind a 13' Whaler with a 30 hp on it. I weigh about 180, and I'm usually with my two dogs, who total about another 110, and none of us are trying to waterski. This can't be that complicated a problem, can it? Any suggestions?
DIVE 1	posted 07-18-2000 10:32 PM ET (US) THE BOW NEEDS TO BE TRIMMED DOWN. IN WHICH HOLE IS THE PIN LOCATED FOR YOUR ENGINE TRIM? TRY MOVING THE PIN DOWN ONE HOLE AT A TIME(TOWARDS TRANSOM) AND THEN TEST RUN THE BOAT. IN CALM WATER YOU SHOULD BE ABLE TO RUN THE ENGINE AT FULL RPM WITH NO PORPOISING.