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Sandbags to keep bow down?

Old 12-12-2019, 01:38 PM
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Default Sandbags to keep bow down?

Have a maycraft 19 cc. Everytime in the ocean the bow just wants to launch in the air. Was thinking of throwing some sandbag in the bow locker to keep it down some. Anyone try this? Also was thinking of trying a hydrofoil on the outboard? I don't have the budget for electric tabs this year as I just repowered with a new etec.

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12-12-2019, 02:02 PM
Drako
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Stuffing your bow has worse consequences than launching it.

Old 12-12-2019, 01:45 PM
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Why not just slow down? I would guess it would take a substantial number of sandbags to make a noticeable difference, and that would be at the expense of speed and fuel efficiency.
Old 12-12-2019, 01:54 PM
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Originally Posted by GrayBeard Pirate View Post
Why not just slow down? I would guess it would take a substantial number of sandbags to make a noticeable difference, and that would be at the expense of speed and fuel efficiency.
Yea I slow down to almost just barley on plane but the boat wants to launch. I know it doesn't have much of a deadrise.
Old 12-12-2019, 02:02 PM
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Stuffing your bow has worse consequences than launching it.

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Old 12-12-2019, 02:09 PM
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Before you add weight move everything you can forward.
Is the motor mounted too low? Does the motor tuck in enough when trimmed down that the nosecone points kinda upwards? How much heavier is the new motor?
A detailed description of the details and a photo would help with this internet diagnosis.
Old 12-12-2019, 02:13 PM
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Originally Posted by Drako View Post
Stuffing your bow has worse consequences than launching it.
x2

boats are designed by the manufacturer who employs marine engineers, tests stability, some times gets approvals/certifications

shifting around weight can have consequences

perhaps the boat is configured wrong or something is off. perhaps a maycraft 19cc does not perform well in the ocean. perhaps its operator error or running too fast for current conditions.

Last edited by mystery; 12-12-2019 at 02:19 PM.
Old 12-12-2019, 02:15 PM
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Go to a reputable prop shop and get a sized prop that will make your boat plane better.
Old 12-12-2019, 02:18 PM
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I have same boat and used a thick piece of steel plate (wrapped in foam) in the bow locker to keep bow down. It worked great but obviously is not adjustable. Eventually I was able to move enough every day carry weight forward(sinkers/anchor etc.) that I got a good handle on porposing with just using motor trim. No matter what you do you will still probably launch off of swells at speed as this is a relatively light hull(1900#). There is always trim tabs and as already stated you can slow down. Off subject but I just repowered from a 135 Opti to a 150 Merc four stroke and am loving it.
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Old 12-12-2019, 02:18 PM
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Originally Posted by Captainhaug View Post
Yea I slow down to almost just barley on plane but the boat wants to launch. I know it doesn't have much of a deadrise.
you probably need trim tabs but how about some data? what is your WOT RPM/speed? planing RPM/speed? time to plane? what power do you have the boat? how is it loaded? perhaps someone with a similar configuration can comment on their data points and you can see if you might have a noticeable issue...but almost all boats benefit from trim tabs...
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Old 12-12-2019, 02:19 PM
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Originally Posted by Walleye Guy View Post
Go to a reputable prop shop and get a sized prop that will make your boat plane better.
the boat planes fine right now looking to get the bow down in a head sea.
Old 12-12-2019, 02:19 PM
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No issue using sand bags to experiment with bow rise. Probably not a long term fix. If you determine 3-4 bags make the boat run better plan to get trim tabs next year.
Old 12-12-2019, 02:20 PM
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Originally Posted by lodel View Post
I have same boat and used a thick piece of steel plate (wrapped in foam) in the bow locker to keep bow down. It worked great but obviously is not adjustable. Eventually I was able to move enough every day carry weight forward(sinkers/anchor etc.) that I got a good handle on porposing with just using motor trim. No matter what you do you will still probably launch off of swells at speed as this is a relatively light hull(1900#). There is always trim tabs and as already stated you can slow down. Off subject but I just repowered from a 135 Opti to a 150 Merc four stroke and am loving it.
Thanks for your input. I know it has its limitations but If the bow was down it would ride a lot nicer instead of pounding so much
Old 12-12-2019, 02:32 PM
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Will a set of trim tabs fit the stern?
Old 12-12-2019, 02:38 PM
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Engine fin would help
Old 12-12-2019, 02:42 PM
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Originally Posted by mystery View Post
x2

boats are designed by the manufacturer who employs marine engineers, tests stability, some times gets approvals/certifications shifting around weight can have consequences perhaps the boat is configured wrong or something is off. perhaps a maycraft 19cc does not perform well in the ocean. perhaps its operator error or running too fast for current conditions.
I think you'd be surprised or possibly shocked at how few recreational boat builders have a genuine engineer on staff. A degreed engineer is expensive to employ. Competent engineers get better job offers from more stable and high tech companies. I can't speak about Maycraft but lots of boat builders have what's known as a "seat of the pants" engineer. I've met many. Some are successful. Not all. If you hang around a boat builder long enough you'll know how to do many things. But you probably won't know why to do them that way. Wait until the next hurricane and you can get free sandbags.
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Old 12-12-2019, 02:47 PM
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Trim tabs biggest you can fit or the ones with fins
Old 12-12-2019, 02:48 PM
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Originally Posted by Island Marine Group View Post
I think you'd be surprised or possibly shocked at how few recreational boat builders have a genuine engineer on staff. A degreed engineer is expensive to employ. Competent engineers get better job offers from more stable and high tech companies. I can't speak about Maycraft but lots of boat builders have what's known as a "seat of the pants" engineer. I've met many. Some are successful. Not all. If you hang around a boat builder long enough you'll know how to do many things. But you probably won't know why to do them that way. Wait until the next hurricane and you can get free sandbags.
My buddy has the 20 ft maycraft rides a 1000 times better seems they built my 19 ft model first and realized they f*** up and built the 20 hahaha
Old 12-12-2019, 02:50 PM
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Originally Posted by LMK View Post
Will a set of trim tabs fit the stern?
It will I was trying to get by right now without them until next year. Anyone know anything about the self adjusting trim tabs or a fins on the outboard?
Old 12-12-2019, 03:06 PM
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Originally Posted by Milehog View Post
Is the motor mounted too low? Does the motor tuck in enough when trimmed down that the nosecone points kinda upwards? How much heavier is the new motor?
A detailed description of the details and a photo would help with this internet diagnosis.
You skipped over this but it's very important. You need to verify that the motor is at the right height before doing anything else - it's shocking how many just get rigged on their lowest hole and left there. The other thing that's shocking is how your boat handling can be transformed by moving the motor up a hole or two - including making a substantial difference to bow rise.

There are plenty of threads and YouTube videos on how to evaluate whether your motor is the right height - have a look and then evaluate yours. Better yet, post a video of your cavitation plate while you are on the plane - it should be resting on the surface of the water, not buried.

Absolutely don't start adding weight or tabs until you know you have the motor height right or you'll just be fighting a performance-damaging set-up with performance-damaging bandaids.
Old 12-12-2019, 03:14 PM
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Test it with people weight that way u can move em around to see how much weight the bow likes.

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