Boat bottom changing shape?

Nikko

Seaman
Joined
Apr 7, 2005
Messages
55
I've picked up (free) a 1967 14' Islanders (made in Burnaby BC)with a 1980 Merc. 50 (4 cyl) on it. The boat has sat unused since 2000 and was used twice prior to that between 1996 and 2000. The rest of the time it's sat, uncovered but tilted (bow high) and plugs out.<br /><br />It came with a (used once) trailer that has 1.5" wide bunks (they're short). The bunks do not go under (past) the transom and the trailer does not have keel rollers except for one near the bow. The entire weight of the boat is on the bunks (and the one forward roller).<br /><br />I managed to get it on the water a couple of weeks ago (thanks much to the Merc. forum for helping me get it going!) and when I popped up on plane I noticed the boat seemed to wallow a lot. If I was to describe it, it was like an old Ford truck grabbing a rut on the road and following it. If you fight it, it fights back, but if you let it wander, it works itself out and wanders a bit quite happily, but generally head where you want it to go. If I pull back from WOT (5300 RPM) and run it about 4000 RPM, it tracks much nicer.<br /><br />I initially thought I had a simple engine trim problem so I reset the trim bar back a (trimmed the motor up) to see what differenc it made. I detected nothing noticable and the boat still behaved the same way. More to experiment with here I think...<br /><br />When I loaded the boat up with kids, it seemed to settle down and track much nicer, but still wasn;t quite right.<br /><br />Couple of other things to note. The transom seems rock solid. The boat has a bilge plug and the previous owner told me that after every trip, be sure to drain it as it always has water in it. I did, and I seem to be getting about a pint after a full afternoon's running. This is consistent with what he found and he's known the boat for years (it's always been that way as long as he's known it). the boat sits with plugs out on land, and always has. <br /><br />The floor seems solid. It's not rock solid, but I'm not the least bit worried about going through it..<br /><br />And now for the thing that worries me. When the boat is on the trailer and I pop my head under it to look, the hull is quite badly distorted where the boat is sitting on the bunks. I'd say I have at least an inch deflection, maybe a bit more. It's sort of cupped shaped.<br /><br />I believe this hull deflection is occuring when I'm running and that's why the boat's wallowing..the hull is constantly changing shape.<br /><br />I called the manufacturer and was told that this hull type has three stringers in it, one down the middle, one down either side. I have not drilled the floor to locate the stringers and I have no idea what shape they're in. Based on the hull defelction, I'm extremely suspect that they're shot. but based on the fact that there's no floor deflection, and I'm pretty sure it's only 1/2" plywood (which would distort if not properly supported) I'm not so sure. However, I do believe the boat should handle much better than it does.<br /><br />Ideas? Am I cutting the floor out and learning way more than I wanted to about stringers and fiberglass?<br /><br />boat pic at:<br /><br /> http://www.robswoodworking.com/images/IA_3.jpg <br /><br />Thanks<br />Rob
 

flashback

Captain
Joined
Jun 28, 2002
Messages
3,987
Re: Boat bottom changing shape?

Nikko, I would suspect that your assumption about rotted stringers is right. does the boat have carpet in it? if so, remove it and see if the floor is installed in sections and remove a section to see what the stringers look like. (preferably at the stern) also, I would install 2x4 bunks just for my own peace of mind and be sure the bunks are located inline with the stringers.. By the way, that boat looks real nice and you cant beat the price!
 

Nikko

Seaman
Joined
Apr 7, 2005
Messages
55
Re: Boat bottom changing shape?

Flashback:<br /><br />Thanks for the reply and comments on the boat. Yes, the price was most certainly right! It was a bit of a karma deal though, in that as part of the deal I agreed to pass my 14' aluminum (Johnson 20 and console) onto another family that would use it. I did, and it's getting a rebuild as I typs and should hit the water as a resident cabin boat in a month or so. Not one $ has changed hands..it's pretty cool!<br /><br />No, there's no carpet and I don't think there ever was any and unfortunately the floor is all one piece. When (there...I said it!) it comes out, it'll be in one piece and thanks to a worm drive!<br /><br />I've read that the bunks should extend past the transom. I'd be curious if this is a no-brainer or if there are different opinions about this?<br /><br />Nikko
 

Mark42

Fleet Admiral
Joined
Oct 8, 2003
Messages
9,334
Re: Boat bottom changing shape?

A quick note on the drain plugs: Pick up new plugs, clean the plug holes well with steel wool (if brass tube) or what ever seems appropriate. When using the new plugs, tighten them up with a pair of pliers to ensure that they are sealing. Go for a ride and check how much water is in the drain. It may be nothing. <br /><br />The reason I say to do that is my boat had water in it after every trip (about 6-8 oz drink cup full) until I used new plugs, cleaned the plug holes of corrosion and tighten with pliers (usually an extra half or 3/4 turn after hand tight) and no more water. <br /><br />The old plugs can be hard, the holes may not be clean enough for the plugs to seal against. And be sure that they are transom plugs and not live well plugs (Livewell plugs are the type with the flip lever, transom plugs have a T shaped handle to screw tight).<br /><br />Good luck with the stringers.
 

JasonJ

Rear Admiral
Joined
Aug 20, 2001
Messages
4,163
Re: Boat bottom changing shape?

Mark, that is a good point on the plugs. Not to hijack the the thread, but I have had water in the hull after every trip this year, and I am thinking it is time to replace my plug and clean the hole. I also never tighten with pliers, I just tighten hand tight. It has been fine in the past, but maybe the plug is done now and is seeping. I didn't have the problem last year, and I leave the boat in the water all season long with no water intrusion at all. <br /><br />As far as the hull deflection, My boat had warpage as well due to rotted stringers. When you do your teardown, you will want to let the hull set after all the junk is out for at least a week before rebuilding. The hull will return to its original shape without all that weight. Mine did, it was amazing to see, it was like it was fresh out of the mold. Also, you may want to rethink how you will rebuild it. Maybe add more stringers, ensuring there is a stringer positioned directly above where the bunks are when the boat is trailered. Foaming all of the voids under the floor will add structure as well. My boat has six stringers, and all the voids except the center bilge is foamed solid, so my hull is very solid. Good luck...
 
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