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Post by tiger on Jun 5, 2019 19:13:27 GMT -5
When I tested the boat and several times since, I have experienced porpoising. The issue is the worst and most obvious when at full throttle with the engines trimed UP. If I hit the smallest of waves (intracoastal on a dead calm day with the wake from a kayak would qualify), the boat nose will come up, then bounce down then up then down, each time it goes further until I reduce throttle, tab down a lot or take all the trim out. Tabbing down causes other issues such as reducing handling and adding drag and it is the least effective solution. I do not often run full out but I would like to know the solution. I thought I just needed to learn the boat but I have 56 hours on it now and I think I know it well enough to know its not me.
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Post by fishnfool on Jun 5, 2019 20:07:34 GMT -5
Trim down
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Post by outtadblue on Jun 5, 2019 20:29:53 GMT -5
Trim your motors down. Common on all boats.
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Post by tiger on Jun 5, 2019 20:57:21 GMT -5
OK then what's the trim for?
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Post by noslackline on Jun 6, 2019 7:51:10 GMT -5
Trim your motors down. Common on all boats. What he said!
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Post by footy3 on Jun 6, 2019 8:01:31 GMT -5
that's exactly what the trim is for, to allow you to find the sweet spot, which will be different all the time depending on the weight distribution, water conditions, wind conditions etc. It can change from people moving around, it will be different if 3 people in the stern move up to the bow. It's totally normal. trim up to get some of the hull out of the water, when you start porpoising you know you went to far, trim it back a little until you're riding smooth. It's not static, you'll probably find you are making adjustments frequently throughout a trip. Good Luck.
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Post by outtadblue on Jun 6, 2019 9:09:07 GMT -5
^^^^ that’s it.
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Post by finatic on Jun 6, 2019 16:21:29 GMT -5
I always trim my Motors to get maximum RPMs. But that starts the porpoising.so to keep the RPM's up up and stop the porpoising trim tabs down a little bit brings the bow down and stops the porpoising. This way you could still keep your Motors trimmed they're not laboring and you get the best speed for the given RPM you're running.
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Post by reelkul on Jun 7, 2019 9:14:58 GMT -5
If your boat is porpoising that easy you may need to lower your engines.
I use my trim tabs to adjust the tilt of the boat and the bow height if I have too many people in the stern. Typically I use very little trim tabs.
I trim the engines up and down to get best fuel economy. So if I am going on a long haul, where I will be on-plane for a while, I will trim the engines all the way down before getting on plane. Once I am on plane I trim the engines up until it starts to porpoise. Then I trim the engines back down just slightly. I have Yamaha Command Link gauges and they have 10 marks for my engine trim indication. My boat typically starts to porpoise on the 3rd mark. I trim the engines back down to 2nd mark when on plane. My gph goes up from 1.8-1.9 to about 2.0-2.2 when slightly trimmed up.
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Post by Deleted on Jun 9, 2019 7:24:55 GMT -5
If the boat is porpoising like said above it’s over trimmed. Start with the trim set deep to plane off. Plane the boat off then Run the trim up slowly with the tabs up and when the boat starts to feel light and a slight porpoise starts then back down the trim slightly or slightly drop your tabs to remove the porpoising. The latter is were your boat will be the fastest. Just don’t over tab.
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Post by tiger on Jun 16, 2019 19:28:44 GMT -5
It takes hitting a small wave or wake to get the porpoising going. Just enough to lift the bow a tiny bit and it bounces down, but its like flubber, each bounce makes it go higher and higher. No one in the stern. Everyone is either at the helm or in the bow seating. If the water is dead flat it won't porpoise and I can trim it really high. I could hit the wake of a canoe passing by and that would trigger it. To me 2 bars up is not really trimmed at all. I would think somewhere in the middle of the gauge would be about where it ought to be otherwise why make a gauge that goes so far, or why make it trim such a range. Perhaps that means the engines are too high but they are set by the factory. I appreciate the responses.
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Post by tiger on Jun 16, 2019 19:35:47 GMT -5
I just watched a Freeman 37ft at full throttle get trimmed out over 50% and they gained a lot of MPH by doing that.THis was NOT on flat water. By flat, I'm talking about a lake on a day with no wind.
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Post by Deleted on Jun 17, 2019 8:44:04 GMT -5
Cats hulls and vee hulls are trimmed differently.
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Post by Deleted on Jun 17, 2019 8:46:00 GMT -5
Don’t worry about what the gages say, worry about how the boat handles. I use to do a lot of offshore racing back in the day and know how to trim both vee hulls and cats.
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Post by Deleted on Jun 17, 2019 8:47:38 GMT -5
Props also play a big part in the handling of the vessel. That’s said trimming is super important.
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