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Author Topic:   Sea Drive Conversion
jimh posted 07-09-2006 12:13 AM ET (US)   Profile for jimh   Send Email to jimh  
Please use this discussion exclusively for comments and questions about the article in the REFERENCE section by Robert Schmidt on

Sea Drive Conversion
Re-fitting a Boston Whaler OUTRAGE 18 Full Transom to Set Back Bracket

There are many older Boston Whaler boas with Sea Drive OMC engines available from time to time, and they represent a very good way to get into a full transom Boston Whaler. Robert and Brian did an excellent job accomplishing the conversion, and Robert did an equally fine job on documenting and photographing the process, as well as writing the article.

It is a great pleasure to add this to the REFERENCE section. I think it will be a very popular addition.

PMUCCIOLO posted 07-09-2006 12:30 AM ET (US)     Profile for PMUCCIOLO    
bdb posted 07-09-2006 12:26 PM ET (US)     Profile for bdb  Send Email to bdb     
Rob was very gracious and shared this article with me some time back. My son and I are tackling the same project on our 18 and being able to go to school on Rob's presentation has already been extremely helpful. Thanks again Rob.
ratherwhalering posted 07-12-2006 12:34 AM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
No problem, I hope it helps anyone else thinking of taking on this project!
Whaler_bob posted 07-12-2006 10:50 AM ET (US)     Profile for Whaler_bob    
I had a early 80’s 22’ Robalo with a V6 Sea Drive. All I can say about the Sea Drive is to quote Donald Sutherland from the Space Cowboys movie “What a hunk of junk”. The way OMC built the huge brackets and so on should have been relegated to commercial barges only. The rig was wayyyyyy too heavy and detuned for consumer applications.

I replaced ( the work was done at Moriches Boat and Motor in E. Moriches, NY) the 140-150hp V6 Sea Drive with a 225hp V6 Suzuki. The Sea Drive brackets were replaced with a positive flotation Armstrong bracket. The hydraulic steering was upgraded to SeaStar. With the extra hp, lost weight and 30% better fuel mileage- the old Robalo seemed like a new boat. I’m sure Mr. Schmidt feels the same way about his “new” Outrage too.

andygere posted 07-12-2006 11:28 AM ET (US)     Profile for andygere  Send Email to andygere     
Rob's article shows that for those with the time, motivation and talent, there are some excellent full transom Whalers out there just waiting for a new lease on life. I often see SeaDrive Whalers languishing on the market, and I suspect many of them can be had for below market prices as compared to notched transom models. Nice work Rob!
Marlin posted 07-12-2006 09:41 PM ET (US)     Profile for Marlin  Send Email to Marlin     
I continue to be amazed by the quality of work that I see on this site, both amateur and professional. Big transom holes just disappear, chewed up chines reappear as good as new, entire decks get replaced without a trace of rework. It's astonishing how well these boats can be brought back to like-new condition!
erik selis posted 07-13-2006 07:07 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Great job Rob! Hat's off to you.


Billymac posted 07-14-2006 12:10 PM ET (US)     Profile for Billymac  Send Email to Billymac     
I have an '87 22 Revenge WT that had twin seadrives. We did a conversion about 3 years ago to an Armstrong bracket and a single 225hp outboard. We did a little ourselves but most was done by a marina. When I have time I will put together the story on it. It is now a very nice rig, with great performance, that sought after full transom and a much more fuel efficent setup. Boat is on Lake Michigan in Chicago and may be for sale in the next year or so.
CUOffshore posted 07-18-2006 01:08 PM ET (US)     Profile for CUOffshore  Send Email to CUOffshore     
Thanks for the post. I never considered a jack plate and had always assumed that I'd have to put a heavy bracket on the back of this one when the time comes...

Now I am thinking a jack plate and a 200 Yamaha (or an E-Tec) would be perfect!

Thanks again.


ratherwhalering posted 07-18-2006 02:45 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
Dave, that's a beautiful Outrage. Considering all the extra laminate and plywood that was added to the Outrage-18 with Sea Drive, I think 200HP should be nooooo problem!
CUOffshore posted 07-18-2006 05:52 PM ET (US)     Profile for CUOffshore  Send Email to CUOffshore     

Here are a few more shots that we took today...

Thanks again for your post!


Nosler posted 07-28-2006 08:35 AM ET (US)     Profile for Nosler  Send Email to Nosler     
Can you explain me :

Was the 18' originally with a standard transom and an outboard engine or was it originally with a full transom using a sea drive.
Does anyone knows how to modify a standard transom on a 19' II (1992) to a full transam in order to install an Armstrong bracket.

Thanks in advance.
REgards from France

Plotman posted 07-28-2006 03:05 PM ET (US)     Profile for Plotman  Send Email to Plotman     
You don't need to modify the transom to install a bracket. See here:


jimh posted 01-02-2007 01:30 AM ET (US)     Profile for jimh  Send Email to jimh     
[Removed off-topic article. Please use this thread exclusively for comments about the boat shown in the REFERENCE article linked above.]
jimh posted 01-02-2007 01:47 AM ET (US)     Profile for jimh  Send Email to jimh     
The entire process of the modification is shown in the REFERENCE article linked above. The boat was built at the factory with the full transom and the Sea Drive power. This was an option which was available for a few years. You can learn more about this option in another article in the REFERENCE section on the general topic of set back brackets. See:

Also see:

jimh posted 01-02-2007 01:49 AM ET (US)     Profile for jimh  Send Email to jimh     
Also see this other Cetacea article on the Sea Drive:

Martino posted 01-02-2007 08:31 AM ET (US)     Profile for Martino  Send Email to Martino     
That does it! I am going to paint my SeaDrives metallic blue, and put Yamaha decals on them.

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