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 BoatUS Boat Groups/Manufacturer Forums>>Doral
Subject Topic: Monticello porpoising Post ReplyPost New Topic
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Joined: January 13 2007
Posts: 24
Posted: July 09 2009 at 22:08 | IP Logged Quote Mikesf

Lately my 2006 Monticello has started porpoising, even in relatively
calm water. Anybody have an idea what causes this? The drive is not
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"Seaman Recruit"

Joined: July 16 2007
Posts: 3
Posted: July 10 2009 at 09:43 | IP Logged Quote p5surf

Porposing is common in all boating and usually indicates
that the thrust from the engine is not parallel to the line of
travel.   If your thrust is pointed downward, even by a slim
margin, it will cause the bow to ride up, conversely if the
thrust is pointed upward, the bow will dig in. Both
circumstances will cause porposing in different conditions.
The trick is to first (while motionless) create an even
distribution of weight around the boat. Next, once
underway, adjust the trim using the trim/tilt of the engine
settings, and then align the trim tabs (if equipped) to assist.
You may also want to check the bottom of your hull to be
sure there are no barnacles, etc... growing on the bottom.
Even a slight growth of alge can cause variation in your
Furthermore, if your boat is equipped with duel engines,
both engines must be trimmed in alignment.

I hope this helps get you started in your journey.

Safe boating!
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