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Old 06-10-2016, 11:30 AM   #1
ljk
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Help me drive my 34P!

Friend of mine took this shot of us last week. The large wake behind the boat bothers me.


Chardonnay has 2 240 hp Yanmar diesels. We cruised at 17 mph burning a little less than 1 gallon per mile, generator also running.

Comments? suggestions? Do I need to trim the bow down more? Up?
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Old 06-10-2016, 11:37 AM   #2
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I am not getting the image.

Btw, kudos to you for considering your wake. As Bob Hale once said, "most boaters never leave bad wakes because they never look behind them to find out".
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Old 06-10-2016, 12:39 PM   #3
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Looks more like prop was than wake. Are you well on plane? Is thee any more speed available? is this a roundish bottom boat?
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Old 06-10-2016, 01:28 PM   #4
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Old 06-10-2016, 02:12 PM   #5
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Experiment with the trim and watch your GPS for speed change. Do at various rpm's.
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Old 06-10-2016, 02:25 PM   #6
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Wake

Quote:
Originally Posted by bayview View Post
Looks more like prop was than wake. Are you well on plane? Is thee any more speed available? is this a roundish bottom boat?
I seem to be well on plane. The boat feels good. I am running at around 2800 rpm to get the 17 mph. She tops out at 3400 rpm making 25 mph.

The bottom is hard chine, semi-v. Not a round bottom.
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Old 06-10-2016, 02:26 PM   #7
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Sea salt, thanks for getting the image to show in your post. How you do that? BTW, my boat lived in Punta Gorda for 10 years before I bought her.
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Old 06-10-2016, 02:31 PM   #8
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I have the same boat, but with the single Yanmar 370 hp engine. I have never seen the wake from the side like your picture.

But the boat's attitude looks good and your numbers look good. I hit 16 mph with the somewhat smaller hp single at 2,800 rpm (both engines are rated for 3,300). On mine it takes full trim tab down to do that.

BTW, 2,800 is a good conservative cruising rpm, presuming that your engines reach 3,300+ (real phototached rpm) at wot.


And relative to the next post about adding drop fins to the trim tabs, I installed them over the winter and so far I can't see much difference.


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Old 06-10-2016, 02:33 PM   #9
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You may find this thread about improving trim tab performance helpful:

2005 Mainship 30 Pilot II tim tab mod

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Old 06-10-2016, 02:37 PM   #10
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ljk

Go to the photobucket link in your post. Photobucket has 4 choices to copy pictures. The bottom one is IMG. Hover over the [URL=http//... and a hand appears. Left click and it says copied. The come back here and paste it (Ctrl V) into the box.
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Old 06-10-2016, 03:15 PM   #11
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[QUOTE=seasalt007;450687]ljk

Go to the photobucket link in your post. Photobucket has 4 choices to copy pictures. The bottom one is IMG. Hover over the [URL=http//... and a hand appears. Left click and it says copied. The come back here and paste it (Ctrl V) into the box.[/QUOTE]


OK, thanks!
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Old 06-10-2016, 03:26 PM   #12
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You may be a little below the ideal cruising speed for that boat.

As to the wake, how far back and to the sides does it go? To me it looks a lot like the props churning the water. From the photo I can't tell whether it ever really would impact others. I may be totally wrong, but would suggest you looking further.

Think a moment of a surface drive boat. They create a huge rooster tail behind them. It's so noticeable because the props are on the water's surface. Well, other boats have the same, just under the water. You may be at the speed that maximizes it.
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Old 06-10-2016, 03:39 PM   #13
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Quote:
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You may be a little below the ideal cruising speed for that boat.

As to the wake, how far back and to the sides does it go? To me it looks a lot like the props churning the water. From the photo I can't tell whether it ever really would impact others. I may be totally wrong, but would suggest you looking further.

Think a moment of a surface drive boat. They create a huge rooster tail behind them. It's so noticeable because the props are on the water's surface. Well, other boats have the same, just under the water. You may be at the speed that maximizes it.
Great thoughts, maybe its just the props. The wake behind the boat after the "rooster tail" is quite flat. I will experiment with higher speeds next time I am on her.
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Old 06-10-2016, 03:46 PM   #14
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Relax, there is nothing wrong with your boat.
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Old 06-10-2016, 04:09 PM   #15
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Boat and wake look just fine!!!! David is correct. 2800rpm is a sweet spot for those engines provided they are propped correctly. I had a Pilot 30 II and it cruised at the same speed with the same power setting...but only one of the same engine. 15kts at 2800rpm. That is a great engine and coveted by most Yanmar techs.
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Old 06-10-2016, 04:24 PM   #16
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Great thoughts, maybe its just the props. The wake behind the boat after the "rooster tail" is quite flat. I will experiment with higher speeds next time I am on her.
I doubt seriously that what you're seeing is impacting anyone.
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Old 06-10-2016, 05:42 PM   #17
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Quote:
Originally Posted by BandB View Post
As to the wake, how far back and to the sides does it go? To me it looks a lot like the props churning the water. From the photo I can't tell whether it ever really would impact others. I may be totally wrong, but would suggest you looking further.
I think B is on to something. Now that I can see the photo, I would bet that if you look at the wake 2 boat length astern it will not be significant.
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Old 06-11-2016, 03:21 PM   #18
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LJK, I have the same boat, with twins 240hp Yanmars. At 2800 I'm doing just about the same, my wake is not bad at all. When I slow to 10 mph my wake is really big, it's only good for when the Dolphins are around. I'm usually doing 8mph or mid teens.
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Old 06-11-2016, 09:19 PM   #19
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Thanks all. Guess I won't lose any sleep over my wake. Can't wait to experiment the next time we are on her!
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Old 06-15-2016, 03:01 PM   #20
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I occasionally look back and it doesn't look much different then what my boat throws doing 18 knots with a single 315 Yanmar. Your trim looks even better but I don't get a chance to look at mine from the side?
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