Mounting outboard on Cat 27, Suggestions? - SailNet Community
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post #1 of 11 Old 04-17-2007 Thread Starter
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Mounting outboard on Cat 27, Suggestions?

I've recently accquired a 1973 catalina 27, hull #601. It has an old atomic 4 that is beyond repair, and i will be taking it out. I've got a new Tohatsu 9.8, 25 in., four stroke to mount on the transom on a Garelick bracket. I'll be mountng the motor on center. It appears that at the proper height for mounting that I will need to set the mount out a minimum of 4-5 inches for the handle to clear the transom and rub rail. My questions are;
1. What to use for this 4-5 inch extension, maybe wood or aluminum C channel?
2. How much will the water line at the transom raise when I get the old A-4 out? I've already removed the alt., starter, flywheel.
3. The boat came originally with the transom "plugged". I thinking of using starboard as a backing plate on the inside. Do I need to reinforce the transom any further?
Any suggestions would be appreciated. My first sailboat, but have been crewing for a few years and some long charters.
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post #2 of 11 Old 04-17-2007
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1) It would help if you had photos of the transom. I'm sure that CD will have some ideas on this, if he reads this thread. You might want to PM Cruisingdad.

2) The Catalina 27 has a PPI of about 660 lbs. That means that if you remove 660 lbs. it will rise about an inch further out of the water. Of course, this will be determined by where the weight was located.. if it was in the aft part of the boat, it would make the stern rise a bit more than the bow...

3) I would highly recommend that you do not use Starboard. The manufacturer says it isn't to be used for structural purposes... 1/2" marine plywood, thouroughly coated with epoxy, is a much better choice of materials. Starboard doesn't have the structural strength to work as a backing plate.

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post #3 of 11 Old 04-18-2007
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I think your ideas will work fine but I would not use starboard for your backing plate...it does not have much structural strength. I would suggest aluminum or stainless plate cut to fit your dimensions by a local manchine shop would be a sounder approach. Mount the Tohatsu as low as you realistically can to keep the prop in the water in a chop.
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post #4 of 11 Old 04-18-2007
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If you go with the aluminum, make sure you use a galvanic isolation compound on any fasteners you use... Tefgel or Lanocote, and use plastic washers between the stainless steel and the aluminum.

Stainless steel, while stronger than either aluminum or plywood is far harder to work with.

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post #5 of 11 Old 04-18-2007
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I once talked to a guy who removed his old A4 on a C-27 and put an outboard on the back. He used this device (Breeze Industries - Marine Products featuring EZE-Lift) rather than the traditional bracket. He said this new lift distributed the weight of the motor better.
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Jotun...neat device...I've never seen one of those before!
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post #7 of 11 Old 04-18-2007
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I would use some marine plywood for the spacer you need to mount the bracket. Laminate as many layers as you need and epoxy the entire block to keep out any moisture. Then you can paint it to match the hull. My old boat had 3" fiberglass disks followed by a couple of 2" washers as backing for the mount. This seemed to work fine. No stress cracks or signs of failure after 20 years. The disks looked like deck material without the core. I had a johnson 9.9 sailmaster that probably weighed around 80lbs.
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Quote:
Originally Posted by camaraderie
Jotun...neat device...I've never seen one of those before!
The device was neat because the system enabled a user to easily pull the motor all the way from the water. No prop drag. However, you had to use a line to operate the lift, and I wondered if, over time, the line would wear out or rot. Maybe you could replace it. It is worth investigating, though, because the inside of the transom on a C-27 is not well reinforced.
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JOtun-

I've seen those before, and the line, at least on the one I saw was user replaceable... a pain to replace, but doable.

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post #10 of 11 Old 04-21-2007 Thread Starter
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Thanks for all the suggestions. I've decided to have a machine shop weld me a bracket from aluminum. I'll first make a template of the transom. 3/4" marine plywood backer, epoxy, instead of starboard. After mounting the bracket, I'll bolt the motor mount to it. BTW, got an email back from the gal at eze-lift, no longer making the product.? Will post pictures of the finished project when done. thanks
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