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Boat porpoising. Horrible spray. I think I know the answer but dealer giving pushback

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Boat porpoising. Horrible spray. I think I know the answer but dealer giving pushback

Old 06-01-2021, 09:42 AM
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Default Boat porpoising. Horrible spray. I think I know the answer but dealer giving pushback

I just bought a 2021 cape craft 180cc with a suzuki 115.
the break in was rather slow. But I noticed a little spray around the motor. I thought it was the transducer roostering but it wasn't a rooster. It was a fanning. And it was both sides. I took it the next weekend and we could run it a bit harder. I started porpoising like crazy with an adult sitting on the front seat of the CC. I had to trim all the way down to avoid porpoising which then caused massive drag and spray..
I took it back to the dealer for a few adjustments including that.. Oddly enough the 2 things that I think Cape Craft set wrong are the things in question. Imagine that. One of them being the motor. I was convinced the motor was too low. It's set on hole 2. I was almost thinking it should be 4.
the dealer called and said he checked OEM and it was "mounted correctly " per cape craft. There's just no way.

My first question is "could there be another reason I'm getting drag and porpoising?"

Am I off here?

Second the dealer said he is concerned about moving it up a hole or two because it might cavitate and overheat within 15 minutes????
is that a concern? Wouldn't cavitation that bad be painfully obvious?

Im not trying to get into a "performance " scenario which I'm concerned that's why they're pushing back.. I don't want my wife and kid bouncing like a horse as we try to get zipping through the water and I don't want spray everywhere.

Would moving it a hole or 2 really be all that disastrous?

Last edited by haystack; 06-01-2021 at 12:49 PM.

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06-09-2021, 05:51 AM
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Holy fricken lord......the predictions from those calling out the ones who will still ask for pictures and other items that were very clearly addressed already were right. Good grief.....it was like I should have maybe repeated myself a few times. Haha.

I'll try to do a summary for educational purposes for anyone who already doesn't know everything and might want to learn. I've had a few boats in my life and learn a new thing every time.

The summary should be short but since people brought up things unrelated to the original post I'll try to touch on those too..

1. I said I was out of town and the dealer had the boat. I may have said it twice or even 3 times after multiple repetitive responses.
2. I said I completely realized that that picture wasn't good. I knew what was needed. But a Full disclaimer was clearly provided and repeated. I explained it was the only picture I had for another random reason because.......(see #1).
3. It was too low. By 3 holes. I asked them for a side profile photo before they raised it but they did not do it. I really wanted to compare. I'm on hole 5 now. It runs like a dream. Its faster. It obviously does not overheat (that was really the part that made me post my question...when he said that). It does not have cavitation on hard turns. Porpoising is almost eliminated but it was rough/choppy out the past 2 days but just normal bouncing that was easily controlled. I haven't even installed my trim tabs yet.
4. I do have a left hand turning motor. As someone guessed......motor shortage. They wanted to get me out on the water. They said they'd be happy to switch it if I didn't feel that was disclosed but I can't imagine I'd even know. I'm not into flipping boats so resell isn't a problem and I get my props from a place in cape Canaveral that takes awhile anyway so they have a 3 blade They're getting me.
5. I asked for a 4 blade. Because I knew I'd get a spare anyway and will get my own 3 blade. I switched from a 3 to a 4 on my last boat and loved it. We'll see what I like better when the 3 comes in. They're all different and personal preferences can change.
6. It's a stainless steel prop. I assumed that should have been obvious and not even what we were talking about. But hey.....maybe it looks aluminum.
7. The transducer is on the wrong side. They will gladly switch it for me. I told them if I get disturbance I'll let them know and he said even if its a year from now they'll take care of it. So far so good. Ill mostly use It under trolling conditions anyway.
7a. The transducer is not the point of spray. As I mentioned the spray was on both sides.. it fans out. It's not a small rooster tail.. I've experienced that before with garmins stupid design that created a channel that worked like a Super Soaker.
8. Here's the reasoning Cape Craft gave. They do recommend Hole 2. However because the transom is "hand cut" I believe they said it can vary. Dumbest thing I've heard if you're going to give specs that specific. Maybe I'm wrong but it was off by 3 holes. I've other hang ups with Cape Craft on this boat. Huge quality control issues over very minor things but complete slop and a total lack of response. I'll get the boat to where I want it but I cannot recommend Cape craft at all at the moment. They have yet to return a call or Email over a 3 week period. Even though you get an automated message from the owner that says "I can't wait to talk to you".
8a. I do wish the service team would have verified the height vs just going with the specs.. As you'll see in the picture it is just about right now. It must have been really bad.
9. It does have indented transom.....layman's term.....I think someone said it might be a step transom? That and the level of the trailer is why I Indicated that picture was not good. Did I mention that I knew the first picture wasn't good? 😀

10. Aaaaaaand wouldn't you know it. The photo upload is spinning and won't show the photo that I just took. wow. After all that. I'll try again on a desktop later. But it is good. Perfectly even with the very bottom of the "V"

11. I will consider a jack plate but maybe later. It runs so good now. But it would be nice especially in areas I go.

12. Let me know if I overlooked anything. We really got off on a tangent. And thank you to everyone who really did want to try to help and understood what I was trying to ask and not focus on asking things like "why is your boat so white"

13. I won't respond to inane garbage that takes pride in being too lazy to read. So if you say "TLDR" and make me Google whatever the heck that means and find out it means "too long didn't read" and you ask a question that was clearly addressed.......I'm not hand holding.
Old 06-01-2021, 10:04 AM
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Where is the anti-ventilation plate with respect to the bottom of the hull?

If the cavitation (anti-vetilation) plate is already an inch or two above the bottom of the keel, I'd be hesitant.
If it's at the same level as the bottom of the keep or lower, moving it up would be a no-brainer.
Old 06-01-2021, 10:10 AM
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Take one of these pictures,, exactly like this..
Old 06-01-2021, 10:12 AM
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The dealer isn’t gonna get into an engine height adjustment issue, Not good for him.
Old 06-01-2021, 10:21 AM
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Originally Posted by Dacman View Post
The dealer isn’t gonna get into an engine height adjustment issue, Not good for him.
Which I get but if that's not the issue they have to find the issue. It's unbearable. The water can be like glass and it will feel like we are on an episode of deadliest catch. Haha.

And if it's not porpoising it is spraying horribly.

I just can't imagine popping it up the 1.5 inches would lead to "overheating in 15 minutes "

I get they don't want to do it but it has 2 days (a total of maybe 8 hours) on it. And something must be wrong. It's a horrible ride.

Last edited by haystack; 06-01-2021 at 10:27 AM.
Old 06-01-2021, 10:26 AM
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Originally Posted by jobowker View Post
Where is the anti-ventilation plate with respect to the bottom of the hull?

If the cavitation (anti-vetilation) plate is already an inch or two above the bottom of the keel, I'd be hesitant.
If it's at the same level as the bottom of the keep or lower, moving it up would be a no-brainer.
So I knew it had to be pretty close. I knew to measure that and unfortunately I already dropped it off otherwise I'd post a photo.

But I did eyeball it a week ago and it looked pretty close to even. Again though just eye balling it. When I took it in the owner came out (he's been our guy on all of our boats for years and knows us pretty well) He walked around back and immediately said "oh yeah that's low".

I was almost 100% convinced moving it up a little wouldn't be that big of a deal at all but I felt like him saying "overheat in 15 minutes " over a 2 hole adjustment was an exaggeration

Last edited by haystack; 06-01-2021 at 12:50 PM.
Old 06-01-2021, 10:27 AM
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Take the picture Dacman said to or when it is running at speed take a picture over the transom to look at height of A/V plate.

if it is buried in water at speed than raise the engine.
Old 06-01-2021, 10:41 AM
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Originally Posted by bluedart View Post
Take the picture Dacman said to or when it is running at speed take a picture over the transom to look at height of A/V plate.

if it is buried in water at speed than raise the engine.
I imagine this is just hard to even discuss generically without photos. I knew that and should have done that before I dropped it off. I guess I was so convinced that was the issue.
Unfortunately I realize the below picture is tough to tell. I took this for a friend shortly after I got it and it wasn't intended to measure the plate height.

I'll see if they can take a photo for me because I see what everyone is getting at and this really helps.. it helps me with a discussion point for them.


Old 06-01-2021, 10:44 AM
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Trim , tilt and tabs are not set it and forget it features. They need to be adjusted as the sea state dictates, this is why they have adjustment buttons. It is a small boat and weigh distribution needs to be taken into consideration as well, make sure your load is even. You have to find the sweet spot for the given conditions. Try running with the motor all the way down and no tab. Then gradually tilt the motor in small increments until you feel the proposing starting , kick it back down a pinch and give it a hint of tab. Raising the motor will help it run flatter but try this first .
Old 06-01-2021, 10:47 AM
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Looks 6-12” too low from that angle. Going to need a shorter shaft if that’s for real
Old 06-01-2021, 10:48 AM
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Originally Posted by quick View Post
Trim , tilt and tabs are not set it and forget it features. They need to be adjusted as the sea state dictates, this is why they have adjustment buttons. It is a small boat and weigh distribution needs to be taken into consideration as well, make sure your load is even. You have to find the sweet spot for the given conditions. Try running with the motor all the way down and no tab. Then gradually tilt the motor in small increments until you feel the proposing starting , kick it back down a pinch and give it a hint of tab. Raising the motor will help it run flatter but try this first .
That's all stuff I'm familiar with. 4th boat of my own. Several others In the family growing up. Not counting friends boats. This is the first time I've had this massive of an issue. Trim all the way down is the only option. We also shifted 2 adults to the front and Still bad. That amount of spray when not porpoising is the other issue. Even with the motor trimmed up and bouncing we still have some spray.

Something is definitely unusual. I'm familiar with Trim changes but this is not that.

Old 06-01-2021, 10:55 AM
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Originally Posted by Xjclint View Post
Looks 6-12” too low from that angle. Going to need a shorter shaft if that’s for real
it's a horrible angle. I just happened to find that in my phone. I mentioned in the post I realized it wasn't great for the purposes mentioned here.

I realize that That's what I need to push back to the dealer with. So I appreciate everyone's help there.

I guess overall I was mostly concerned that he was saying I'd overheat within 15 minutes.

Last edited by haystack; 06-01-2021 at 12:51 PM.
Old 06-01-2021, 11:05 AM
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This dealer is a moron. Engine is way low, even with the crappy angle of the picture we can tell that it's low. take the picture as requested and we can give you an answer. Cav plate should be an inch or so above the bottom of the boat. Your engine isn't going to overheat unless the prop is 70% out of the water too so that's just B.S. that the guy is feeding you...
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Old 06-01-2021, 11:52 AM
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After seeing the photo I would agree with the others that that engine needs to come up.
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Old 06-01-2021, 11:53 AM
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Dealers seem to have a thing about mounting engines too low (or is that just my experience?) - the Opti that was on my boat when I bought it was set too low by the installing dealer and the owner had to have it raised.
Then when I installed my 225 V6 last year and the dealer arrived to initialise it, his first comment was that the engine looked too high (turned out where I’d set it was spot on).
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Old 06-01-2021, 12:00 PM
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I will say that the photo is definitely not the best for this purpose. It certainly looks worse than it is. Angle of the boat , driveway, etc. Plus the area where the drain plug is actually recedes back.
So I still will get a better photo. But it was all I had for now. I'm out of state otherwise I'd probably be down there right now having them disprove me basically.
I think it will be fine once the owner gets involved. He's good people but I don't want to throw that whole "get me the owner now" card.

Hopeful 2 holes is enough room and it fixes those symptoms.

Last edited by haystack; 06-01-2021 at 12:51 PM.
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Old 06-01-2021, 12:01 PM
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Default boat-porpoising-horrible-spray-i-t

Absolutely too low
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Old 06-01-2021, 12:03 PM
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Looks way low to me, although with the angle of the photo, and a transom notch, that may be an illusion.
In that photo it almost appears as a long shaft motor on a boat intended for a short shaft.
If it measures low when you actually measure it, raise it and run it. If you are happy with the performance, and it has water pressure, you're good. If its too much, split the difference and try it.
As for overheat . . . you only need a couple of minutes to see how it performs, and you can keep an eye on the guage. I think he is over reacting - as a kid I raced production v-bottoms, we had the propshaft above the bottom and still could keep water pressure for sprint races.
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Old 06-01-2021, 12:04 PM
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Just curious did you sea trial before buying it? How did it run then?
Old 06-01-2021, 12:09 PM
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Yeh , that picture does nothing.
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