water over transom prob

[fishfeatures]

My little runabout in the avatar has a 60hp on it which is 10 hp over max ( no regs over here and transom has been redone and knees added,and floatation foam redone , before anyone panics.)

anyway if I'm out fishing in the bay and it's slightly choppy, I tend to get water over the transom, now the pump can deal with it but i am a bit worried if i get a freak wave some day that it may cause me some hassle and put the stern under.

Anyone else experience this? I'm thinking off adding a plate either side of the motor about 8-10 inches high to stop this , so if anyone has any pics of theirs and wouldn't mind showing it off please post...

 

[pcrg28328]

Re: water over transom prob

I have a small fiberglass boat very narrow and shallow. With my weight ( im a big guy) and the engine this would happen to me. I had originally looked at bolt on floatation pods like this Cabela's: Beavertail Performance Flotation Pods But decided to just down size the engine and add more floatation in the bench seats and add a whale tail on my engine. No more water for me.

 

[captbren]

Re: water over transom prob

I had this problem on a couple boats of mine, too. I added a jack plate on the back, which helped bring the engine away from the transom as well as allow for vertical adjustment issues.

The addition of a motor well would solve your problem too, that is if you have the room necessary for one. Here's a couple pictures:




Any water that comes over the transom will flow back out the transom through a plug hole at the lowest point of the well. I've also seen them constructed on the exterior of the transom...

Hope this helps!

 

[Texasmark]

Re: water over transom prob

The floatation pods will work great as they extend back to the engine which removes the feet part of foot-lbs of your extra weight vs following wave, and being back there they can affect some practical buoyancy by hitting the waves before your transom does acting like a pre lifting agent.

Putting shields adjacent to the engine helps, but not all that much. I have seen them.

If you are getting water upon cutting the throttle from a plane, just cut the throttle in steps, practice will make perfect. Chop the throttle about half way or so, wait for the following wave to stabilize behind the boat then cut it all the way. That takes half the kinetic energy out of the wave and when it hits you it is not as high, nor as hard. I do it all the time.

Mark

 

[glenn property of pam]

Re: water over transom prob

if the rear is low hows the front of the boat. sometimes shifting a little weight helps

 

[Home Cookin']

Re: water over transom prob

whatever you do, don't rely on the pumps; fix the problem. The object is to keep water out; getting it out is for system failure.

can you build a splash well?

 

[NYBo]

Re: water over transom prob

How much heavier is your outboard than the original? Any chance of saturated flotation foam?

 

[saumon]

Re: water over transom prob

Walleye backtrollers use splash guards like this one all the time. Basically 1/4" Lexan screwed to the transom.

 

[crabby captain john]

Re: water over transom prob

1 small wave coming in if not huge is generally not a problem with a moving boat. It should NOT happen and the situation needs fixed. If a wave comes in the stern goes down-- a second wave can put her to the bottom, capsize the boat, or if lucky just swamp her. None are fun or safe.

 

[fishfeatures]

Re: water over transom prob

I have a splashwell, but in choppy water it can sometimes fill quite quickly if I'm stationary, doesn't hapen when moving or throttling back. I have tried moving everything from the stern batteries,fuel, etc.. but prob still occurs. The is no other weight there esp not water loggged foam as this is well sealed off when i re did the transom.

Saumon; i was thinking of something exactly along those lines. I screw something like that in place and see if that solves it.

 

[chriscraft254]

Re: water over transom prob

It would help us help you if you post up more pictures (larger of the way the boat sits in the water and also interior stern pics. If you already have a splash well, how large are the drain holes? You can enlarge the size usually of the drains to evacuate water more quickly. A 1 1/2 inch drain will draint he splash well five times as fast as a 3/4 inch drain.

The splash gaurds are used on a lot of open transom boats, they can be built out of lexon or starboard either one. Open stern boats can be swamped quickly when at rest, so you do need to get the issue resolved. How heavy was the original motor compared to what you have now? Though, probably not that much difference in hp, I'm guessing on that size boat that the additional weight of the motor is your main issue. good luck.

 

[Home Cookin']

Re: water over transom prob

I have a splashwell, but in choppy water it can sometimes fill quite quickly if I'm stationary, doesn't hapen when moving or throttling back. I have tried moving everything from the stern batteries,fuel, etc.. but prob still occurs. The is no other weight there esp not water loggged foam as this is well sealed off when i re did the transom.

Saumon; i was thinking of something exactly along those lines. I screw something like that in place and see if that solves it.

in that case the answer is simple. your boat is not seaworthy and should not be used as rigged. Seriously. That is not a minor "fixit" problem you have there; it's a fatal flaw. gluing plastic baffles is not the answer.

crabby is right. two waves and you're down and out. stay off the water and if you won't, please boat alone.

 

[JimS123]

Re: water over transom prob

I had the same problem on a boat I used to own. When I put a smaller motor on it the issue went away completely.

 

[glenn property of pam]

Re: water over transom prob

ff i know that your from ireland so you are use to rough weather but what do you class as choppy. Also how far is the lowest point of the rear of the boat above the water when you are parked fishing?

 

[Silvertip]

Re: water over transom prob

Seems to me "wave whackers" are the only practical way to limit water over the transom. Note that I said limit, not eliminate. These devices are commonly installed on folks that back troll for walleye as was pointed out.

 

[Friscoboater]

Re: water over transom prob

It sounds like the real problem is an over powered boat. The original hull was not meant to hold that weight, and now it is letting water over the transom. Flotation foam has nothing to do with how much weight a boat can hold, it just stops a boat from going to the bottom when it gets swamped. If your hull is not meant to hold that much weight, it will let water in.

Simple fix in my eyes. Go with the correct engine.

 

[JoLin]

Re: water over transom prob

I'm curious about the answers that lean toward the root cause being an overpowered boat. The boat's limit is 50 hp, and the boat's carrying 60 hp.

A 50 hp E-Tec weighs 240.
A Merc 50 hp 4-stroke weighs 220.
A Merc 60 4-stroke weighs 250.

The 85 hp Yamaha 3-cyl, 2-stroke on my Sylvan weighs roughly 280 lbs.

I guess my comment/question is... why would downsizing by 10 hp make any difference at all in this situation (the boat takes water over the transom AT REST)? There seems to be very little weight difference among the motors. I think there's something wrong with the boat. Bad design or some other issue.

My .02

 

[glenn property of pam]

Re: water over transom prob

my bassboat is only 6" clear of the water at the rear when im parked so im guessing a one foot wave rolling would flood out the splash well (at one foot im running for home). what im wondering is either the boat is in water it is not designed for (wouldnt take mine out to sea) or the anchor is set wrong and the boat isnt being allowed to swing nose into the waves.

 

[jigngrub]

Re: water over transom prob

Walleye backtrollers use splash guards like this one all the time. Basically 1/4" Lexan screwed to the transom.

+1

I was going to post the same thing.

 

[jestor68]

Re: water over transom prob

Don't anchor with the stern facing the oncoming waves. ???