newbie transom question...

Joined
May 21, 2008
Messages
74
I know I need to rework/replace my transom. I don't look forward to it, but I will feel much better when it's done properly. I've been reading post after post about the process, and feel I can accomplish it with LOTS of work.

So.. here's my question.

Being that I'm using a motor that I really like, and just got it running, I just also realized that it's a short shaft motor. My transom is setup for a long shaft motor.

So... do I look for a long shaft bottom end?

or...

do I adjust my transom height when replacing it, and re-glass the stern splash drain to match? (not sure what that sink looking area on the stern of most outboard boats is really called, you know the one that has a drain hole that's not plugged, to catch the water that splashes in when you stop too fast and let it back out without having to use a bilge pump)

or...

do I replace my transom at it's original height, and then add some sort of additional piece to my rebuilt transom, like I see on so many boats to raise the outboard, but put it upside down, so it lowers my outboard?

or...

open to suggestions :)
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: newbie transom question...

im not an ob guy.....but if you re cut the transom lower.......your chances of getting swamped increase huge......that means you sink !


my advise......go get your wood......start drying it....it takes from a week to a month.......start on the transom tear down......by the time your done.....our new "chief of the boat" will be back from vacation......pm him (tashasdaddy) and include a link to this thread so he can answer in open forum.....ask him to "look in on this one"

there is other guys here that have done exactally what you are thinking of .....quite recently.......i think they used the jackplate method.......
 

jcsercsa

Captain
Joined
May 21, 2007
Messages
3,401
Re: newbie transom question...

im not an ob guy.....but if you re cut the transom lower.......your chances of getting swamped increase huge......that means you sink !


my advise......go get your wood......start drying it....it takes from a week to a month.......start on the transom tear down......by the time your done.....our new "chief of the boat" will be back from vacation......pm him (tashasdaddy) and include a link to this thread so he can answer in open forum.....ask him to "look in on this one"

there is other guys here that have done exactally what you are thinking of .....quite recently.......i think they used the jackplate method.......

Yep I dont rember when or who , but it was a jackplate !! and ooops is right TD is the man to ask !! And I alsp agree get your wood now and get a fan on it [24-7] so it can dry..And if you can the guys really like pics , Ok were all here to help so keep us posted !! John
 
Joined
May 21, 2008
Messages
74
Re: newbie transom question...

yeah, I was pretty much not liking the idea of cutting down the transom, for the very reason that I thought it'd increase the chances of loading up the boat with water when I stop. I think a lowering style jack plate sounds like the ideal solution, plus I've heard nothing but good things about moving an outboard further back on a short (15 foot) boat, and adding some trim tabs.

It will be some time before I get this done, and purchasing wood and drying it is alreay in the works. Believe me, the wood I got for the stringers has been drying for.... oh.. now... bout 2 months. Thankfully no warpage, and I still need to plane it down to size, and cut it to the curve of the hull.

I wish I could get some pictures up, but I've only got a 35mm, and wal-mart is expensive :)

I was glad to get photos of the "original" look of the boat up. I'll add one here just for fun :)

The plastic chairs were a joke, by my neighbor. He said I should just fix the outboard, and screw them down and go for a ride.

I've since added bunks to the trailer, removed the locked roller, replaced the winch, moved it forward on the trailer, added a trailer jack with wheel, replaced the front loop and reinforced with licence plates so it doesn't pull through, removed the junky old evinrude and put in a older evinrude lark, that I replaced the coils and starter solenoid in and have running nicely now. Hmm what else, puttied the top half of the boat, and have it painted and looking fairly good now, just need a final sand and top coat. It's a textured gloss white, I love the look. Oh.. what else, removed the wood from the floor, removed 90 percent of the fiberglass from the floor, removed most of the rotted stringers, am currently grinding the stringer supports down, to cut and bed new ones, oh, yes, filled all the old holes from rope tie downs, and drilled new holes, and added reinforcement, and added new tie downs and a new front light. Still need to drill and mount a new rear light. And todays project... to replace the steering cable. and I might work some on the floor too, grinding some more, and thinking about how I wanna do these stringers. I plan to incorporate some wild triagulation in the stringers and transom, so that I can upgrade to around a 100hp honda when I get the funds to do so, but for now it'll just be really strong for that old 35 lark that looks so sweet on the transom right now. I just wish it was a long shaft.

Anyway, guess that bout wraps it up.

Thanks for the advice, and I'll keep checking this post to see about other suggestions. I think the three options I mentioned are about all that there is, and I think some sort of jack plate sounds perfect.
 

Attachments

  • boat.JPG
    boat.JPG
    94.6 KB · Views: 0

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: newbie transom question...

just noticed some things on your last post ........if i understand correctly.....i might be able to save you some time.....

forget about grinding off the fiberglass off the floor (deck, sole).....just take a circ saw....and cut out the floor.....(set the circ saw so the depth is exactally the depth of the floor) ....thrn replace the whole shabang and re glass it......faster....easyer.....and far less itch.


as for the big 100 hp on the back.....the uscg rules sticky at the top of this forum have the calculations for max hp on a ob vessel.......while 100 ponies would be a absolute hoot! it might not be legal or safe.......

as far as the knees on the stringers go....read the thread called hull extension in progress.......it goes thru everything you want to do including building knees in the stringers.....how to cut the stringers without a template and lots more...its a long thread ....but there is detailed pics of every step....

hope that helps you...
cheers
oops
 

JoeCrow

Petty Officer 1st Class
Joined
Nov 1, 2007
Messages
218
Re: newbie transom question...

I had the same problem,
20" motor - 25" transom
I opted for a new motor, but if it's available,
a much less expensive way to get around it is buying a shaft extension kit
I weighed all the pros and cons of shortening the transom or adding a jackplate and got a lot of good feedback from the forum,
In the end, a longer motor is the only safe to go
HYDROLOCK
SWAMPING
 

redeye1962

Petty Officer 1st Class
Joined
Jul 6, 2008
Messages
319
Re: newbie transom question...

I am a newbie myself and have a dumb question about drying wood. I noticed when I purchased treated wood for my Aluminum boat (I now know that was probably a mistake, but I resined everything) the wood was wet. A couple of days in the 100 degree Texas sun dried it out pretty quick. How do you know when the wood is dry enough to start working with? This lumber turned pale and started to warp pretty bad. I had it lying flat on the ground and would turn it everyday to keep the warp down. Even tried to put pieces on a sawhorse to get both sides at once.
Let me know if you guys think the resin will be a good enough border between the treated wood and the aluminum.
 
Joined
May 21, 2008
Messages
74
Re: newbie transom question...

oops... most of my floor was not fiberglassed in, and I only had three pieces of plywood for the entire floor. They were laid directly on top of the stringers, and screwed into them with wood screws. Then they had puttied around the wood at the raw fiberglass, and added fiberglass over the putty and about 6 inches onto the plywood. The bow section was glassed back to the foot rest for the front passenger and driver, but then the glass ended.

The stringers, all five of em, consisted of the following.

The center stringer, running from bow to stern, was a 1x ?? with a minimum height at the front of 0 inches. and a max height almost at the stern of about 6 inches.

Then there are two 1/2 x 1 inch stringers, that were bedded, and then covered with fiberglass, that don't go to the floor. They just rest in the floor for "support"? One of them is rotted to nothing, and flaking, and the other looks like it was covered with about 10 gallons of some sort of hard putty, and resin. The latter is cracked pretty bad.

Then there are some 1x2's for outer stringers, that the floor was resting on. These are bedded, and fiberglass covered, mostly. I say mostly, because they were covered at the top, and then there's a gap, and then they are bedded. There was wood exposed in between.

Then there were some side to side stringers, three I believe, that were 1x1's, running from the outside stringers, through the center stringer. These were fiberglassed on top, and the sides, but left open on the bottom as well, and not bedded to the bottom of the boat. I guess to let water underneath?

I did some "testing" when I'd first gotten the boat, by floating it, and seeing where I saw water, and there was plenty coming in through various screw holes and such. As the previous owner had used LONG wood screws next to the sides of the boat, that went all the way through the hull.

Anyway, with this "testing" I did, I basically lifted the boat on the trailer, and hosed the inside to help clean out 20 some years of leaves and mud and crud, while leaving the rear drain open, and cleaning it out religiously, to help aid in the cleaning efforts. Well.. in doing so, I realized a BIG problem. The center stringer, was NOT fully bedded, because junk was floating back and forth under it.

Then... I noticed that the middle stringers, that don't touch the floor, were providing a nice dam to water exiting at the bilge area. But it the water quickly rose high enough to flow over these stringers, leaving about 1 inch of water on the outside, to sit, and rot the wood I'm sure.

And.. I noticed that any water that actually got outside the outer stringers, that did go to the floor, had to flow back to the BOW of the boat, and then down the center of the boat back to the bilge area.

So... my plans for the new center stringer, include fully bedding it to the hull for one, and making it out of a nice 2x6, as the center of the bow has a gap plenty wide enough for a 2 by. There was putty in one side of this gap, and I'd rather fill it with WOOD.

Then... for the "middle" stringers, that didn't touch the floor, I'd like to add some 1 by's that DO go the floor, Bed them properly, and cut to size. However, I think I'll include some drain holes, to lead to the bottom of the hull, at three or four locations, to avoid pooling.

Then, for the outer stringers, same thing 1 by's. All the way to the floor, and again, with several drain's, to lead to the center of the hull and back to the bilge area.

As for the side to side stringers, I'm thinking some 1x1's, fully epoxied, and glassed. I like the idea of them not going all the way down to the hull, to allow water to flow under them, as they will only help aid the support of the floor.

As to the floor itself, I'm debating using diamond plate, or cabinet plywood. If I go diamond plate, I can get a single piece large enough, and have it cut to fit, but then the problem is getting it to fit. If I get it in two pieces, front and rear, or left and right, I have to worry about the joint. Same of course for plywood. I know I can't get one piece of plywood big enough, but I'm then in a quandry with 4x8 plywood sheets. Do I go with four sheets, and center the seam at the center of the boat, and then again at the foot rest area for the front? or do I try to use the majority of a sheet, and then have a thin strip on one side.

I'll probably draw a photo to explain the plywood idea.

Anyway, my only other idea was to use nice flooring wood, in the 1/2 by 2 inch variety, and use side to side strips, kinda like laying regular flooring in a home, but in a boat. I'd seal it first of course, and then lay a few coats of some sort of varnish down before using it. The only reason I wouldn't do that, would be cost. I'd love a georgious wood floor, but who wouldn't.

As to the HP rating... the transom plate says it was rated for 100hp. Dunno how.. it's only a lil 15 footer, but I know it only had a 50 on it when I got it, and I was told it would do ~40 knots with that. So I'm hoping for at least 25-30 knots with a 35hp.

And I've read the entire post on the hull extension, twice now. There are still lots of ideas buzzing through my head. I'll probably look at least one more time before I get started on stringers and floor and transom.


JoeCrow... I wish I had the funds for a different motor. And as to the shaft extension kit, I'm not sure I can find one for a 59 lark. I'll keep my eyes open though. I'm thinking I'll probably manufacture something for a lowering jack plate and add that to my transom replacement project. Heck, for the little toting around I might have time to do this summer, I may just try to add my weight to the rear, and take it slow. I just wanna go fishing somewhere other than the dock before summer's out, and take the family out for a picnic, without having to paddle the canoe :)


Also... as to Redeye 1962, from what I've read... treated wood and aluminum aren't a great mix. As to drying wood, I'd opt to not put it in the sun, and I'd be willing to bet, that the sun is part of why it's warping, as one side is getting hot, and drying quickly, while the other side is NOT, and just like a thermostats bimetalic strip, you're gonna get a nice curve to your board. I'd put your wood in a garage, or at a minumum under a tarp, or in the shade. Let it dry for at least 30 days without getting wet, in the heat is fine, in the humidity is not. But I'd say not in the sun.
 

redeye1962

Petty Officer 1st Class
Joined
Jul 6, 2008
Messages
319
Re: newbie transom question...

30 DAYS!!!!!!OMG I know I know Unfortunantly I have a the engine hoist for a couple of weeks at most and no garage to speak of. My wife likes to collect things. I should post a pic on here. you guys would freak. I think I have sold myself on getting regular ply and then encapsolate in fiberglass resin and maybe some 5200 on the top just incase.

I maybe finding myself doing this again in 15-20 years but you know I have learned so much and each time I do this I come closer to doing it right.
 
Top