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Author Topic:   13-Footer: Raising Transom to 20-inches from 15-inches
wayne lq posted 02-21-2007 02:49 PM ET (US)   Profile for wayne lq   Send Email to wayne lq  
How is the transom of a 1968 13-foot Boston Whaler boat raised to 20-inches from 15-inches?
Binkie posted 02-21-2007 03:22 PM ET (US)     Profile for Binkie  Send Email to Binkie     
The easiest way is to put the motor on a back set bracket, for about $150 or so. Unless you have extensive fiberglassing and woodworking experience, or deep pockets, the bracket is the way to go. There is many articles on this site that will show you how its done if you do the research, but if the job is not done in a way that the boat looks like it came from the factory with a 20" transom, you will devaluate the boat. Remember this boat has a radiused transom.

Rich

keltonkrew posted 02-21-2007 03:55 PM ET (US)     Profile for keltonkrew  Send Email to keltonkrew     
I did what was stated above, but still fabricated a wood filler (out of many thin pieces curved to meet the transom angles - decorative piece mainly to keep the water from coming in).

http://www.keltonkrew.com/graphics/whaler-21.jpg

http://www.keltonkrew.com/graphics/whaler-16.jpg

Hope this helps.

Mumbo Jumbo posted 02-21-2007 05:00 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
Here is a shot of my 1972 !3 Whaler after the transom was raised from 15" to 20" by a good fiberglass tech. Worth every penny. Can't tell it from a factory 20" transom.

http://img.photobucket.com/albums/v372/Buckra/Transom.jpg

Binkie posted 02-21-2007 06:10 PM ET (US)     Profile for Binkie  Send Email to Binkie     
keltoncrew
I really like your solution to the problem. Do you have any construction pics? It that solid mahogany you ripped into strips, then formed the radius, and glued and clamped. How is it fastened to the transom? I`d like to find a short shaft version of your Merc, but if I don`t, i1ll do it your way. the more mahogany trim, the better.

Rich

keltonkrew posted 02-21-2007 06:43 PM ET (US)     Profile for keltonkrew  Send Email to keltonkrew     
Binkie,

It's 1/4" thick by 6" wide by 34" long mahogany strips. I built a jig that conforms to the bow of the transom. I glued the individual strips and clamped them to the jig to get the curve. I then cut the angles, etc to match the notches (very time consuming and I said a few choice words during this process).

It's attached to the trasom by the 2 big bolts that go through the jack plate (4 bolts hold the jackplate to the transom) and then just some screws and caulk. It's not a structural piece by any means...more cosmetic and it keeps the water from coming over the top of the transom on quick slow downs.

don't have many construction pics of it...what I have is listed here

http://www.keltonkrew.com/whaler-restore.htm

Hope this helps.

Ducktown posted 02-21-2007 09:01 PM ET (US)     Profile for Ducktown  Send Email to Ducktown     
At the New England Boat Show (on now through Saturday!) in Boston, I ran across a metal fabricator who had made a very cool slide-in insert that bolted in place to fill in the gap. It was made specifically to fit the early 13's. You won't end up with that "classic" look, but it looked very sturdy.

The company name is KentFab. It is located in Hanover, Mass. - a short distance from the original BW plant(s). www.kentfab.com - erik.kent@kentfab.com - 781-659-3355.

Good Luck!

jimh posted 02-22-2007 08:07 AM ET (US)     Profile for jimh  Send Email to jimh     
If you really want to re-work the hull, there is not much of a "simple" way to accomplish it. However, if the goal is just to be able to use an engine with a 20-inch shaft, there is a much simpler solution shown in detail in a CETACEA article:


Whaler Repowering
The Elusive Smell of Forty Year Old Wood

http://continuouswave.com/whaler/cetacea/cetaceaPage56.html

Whaler_bob posted 02-22-2007 10:04 AM ET (US)     Profile for Whaler_bob    
This CW member did an excellent job on his 15" to 20" conversion:
http://users.snip.net/~drobbie/whaler2.htm
keltonkrew posted 02-22-2007 12:09 PM ET (US)     Profile for keltonkrew  Send Email to keltonkrew     
Whaler_Bob,

thanks for posting that link...thats the site I got the idea from for making the jig...I didn't go into the details for making the filler piece as well as he did.....

Binkie posted 02-22-2007 12:57 PM ET (US)     Profile for Binkie  Send Email to Binkie     
I would think using aluminum angles and bolting them to the hull, as in the last post, and then having a bracket fabricated, or buy one and bolting to the alum. angles, would be a better way to do it than having to shim a flat piece of metal to a radiused transom. I`m still hoping to find a short shaft motor.

Rich

contender posted 02-22-2007 08:59 PM ET (US)     Profile for contender  Send Email to contender     
keltonkrew, very nice job you should be proud, I know you made the hull look like factory and it is a nice job, The only thing I would have done different would have been place a flat (bend to fit the hull shape) piece of alum around 3/16 thick and made a plate for the inside of the transom. The alum would have tied the old hull with the new by using the engine bolts through the transom. Nice job
treacyrevenge posted 02-22-2007 09:20 PM ET (US)     Profile for treacyrevenge  Send Email to treacyrevenge     
I have a question to ask you guys. Why do you have to raise the 15" transom to a 20" tansom? Can you not just buy 15" shaft motors? And if so what is the maximum horsepower on a 15" shaft or does that not matter?
Thanks
Binkie posted 02-23-2007 08:36 AM ET (US)     Profile for Binkie  Send Email to Binkie     
treacy,
If you want to go with a new motor,or near new, most of the short shafts I`ve seen are tiller motors, even used its hard to find short shaft motors. I think they look better myself, due to their lower center of gravity.

Rich

Whaler_bob posted 02-23-2007 09:48 AM ET (US)     Profile for Whaler_bob    
quote:
I have a question to ask you guys. Why do you have to raise the 15" transom to a 20" tansom? Can you not just buy 15" shaft motors? And if so what is the maximum horsepower on a 15" shaft or does that not matter?
Thanks

Other than it being hard to find 15" shaft new motors as Binkie mentioned, there are additional benefits to a 20" high transom.

Most old 25/40hp outboards originally chosen for the 13' Whaler were rope start not electric start. Without the starter, battery, maybe generator and other charging/starting parts- and being short shaft... these engines were quite light weight. With these light weight engines the 15" high transom was sufficient to prevent swamping from astern in most situations. Now, add a heavy modern four stroke electric start outboard with a marine battery and a 6 gallon gas tank to an old 13' Whaler with a 15" transom and in many occasions you will take water over the transom cutout.
Other nice thing with a 20" transom is that the engine block sits 5" higher from the waterline... and that’s always a good thing. Another benefit with a 20" transom is that you can use a modern "through the tilt tube" Teleflex steering system without the expensive transom standoff adapter needed with the old 15" transoms.
I've had both 15" and 20" transom 13' Whalers... and the 20" transom is better in all situations.


... Oh, the max HP rating is 40hp for either 15" or 20" transoms on the classic 13's.

treacyrevenge posted 02-23-2007 01:55 PM ET (US)     Profile for treacyrevenge  Send Email to treacyrevenge     
[T]hanks for the very informative replies. You [Boston Whaler boat enthusiasts] know your game.
SenecaWhaler posted 02-27-2007 04:56 PM ET (US)     Profile for SenecaWhaler  Send Email to SenecaWhaler     
Here are the before and after of my 13'. The insert was hand-fitted to match all the angles, it was then coated with epoxy, mounted with multiple lags at different angles and depths. Finally it was reinforced with carbon fiber and then filled in for looks. The Merc 50 has been on it for 3 years now without any issues.

http://s109.photobucket.com/albums/n66/SenecaWhaler/?action=view¤t=2e48bb5e.jpg
http://s109.photobucket.com/albums/n66/SenecaWhaler/?action=view¤t=d723e7d1.jpg
http://s109.photobucket.com/albums/n66/SenecaWhaler/?action=view¤t=b65a9838.jpg
http://s109.photobucket.com/albums/n66/SenecaWhaler/?action=view¤t=000_0827.jpg

SenecaWhaler

SenecaWhaler posted 02-27-2007 05:00 PM ET (US)     Profile for SenecaWhaler  Send Email to SenecaWhaler     
Sorry guys, one of these days I will figure this picture thing out!

http://i109.photobucket.com/albums/n66/SenecaWhaler/2e48bb5e.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/d723e7d1.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/b65a9838.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/000_0827.jpg

SenecaWhaler

Whaler_bob posted 02-27-2007 08:29 PM ET (US)     Profile for Whaler_bob    
Gotta put the [ ] with "url" inside it at beginning of hyperlink and [ ] with "/url" inside it at end of hyperlink.. leave off the " ".
UBB code examples.. http://continuouswave.com/ubb/ubbcode.html

http://i109.photobucket.com/albums/n66/SenecaWhaler/2e48bb5e.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/d723e7d1.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/b65a9838.jpg
http://i109.photobucket.com/albums/n66/SenecaWhaler/000_0827.jpg

Whaler_bob posted 02-27-2007 08:33 PM ET (US)     Profile for Whaler_bob    
SenecaWhaler...
Almost forgot- nice restoration job! Transom buildup came out really nice too. Boy, I wish I had a 50hp on my 13 as a kid. Would have won a lot more races with the other 13's on the bay... ;-))
SenecaWhaler posted 02-27-2007 10:35 PM ET (US)     Profile for SenecaWhaler  Send Email to SenecaWhaler     
Whaler_bob, thanks for your note, and you help.

SenecaWhaler.

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