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Old 12 February 2021, 14:00   #1
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Country: UK - N Ireland
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CMC static 5” Jack plate?

Has anyone any experience with a CMC static 5” Jack plate? Engine needs to go 5” up, XL shaft and wondering about this option.

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Old 13 February 2021, 13:48   #2
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I made the same but stainless steel material from S to L transom. It works for me.
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Old 14 February 2021, 04:57   #3
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I'm also interested in this but seems difficult to find info on hp rating etc
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Old 14 February 2021, 05:20   #4
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i bought some on ebay to fit my xl shaft outboard to a new humber hull but in the end i fitted a new correct length outboard and sold them on .just didnt feel right on a brand new hull. ( well thats my excuse to the mrs for buying a brand new outboard )
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Old 14 February 2021, 06:59   #5
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The CMC MARINE 5 INCH VERTICAL EXTENSION allows the motor to be mounted 5 inches higher than the standard mounting height on the transom
RATED UP TO 300HP / 315 KG

It is a must for FITTING A 20 INCH LONG SHAFT TRANSOM OUT WITH AN 25 INCH XL SHAFT MOTOR


Have a 200 yam v6 xl on back of delta 6m
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Old 14 February 2021, 18:40   #6
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I have a cmc 5” manual. Not for your reason, mine was for speed. It’s a funny sized plate, my steering ram now impacts the transom, therefore I have had to reduce the tilt range. When she lives on her mooring the skeg is always in the water slightly and gets furry.

The bracket has stood up to the abuse of a 70mph boat but if I am honest the engine never looks as secure as one hanging directly off the transom.

I wouldn’t do it again for the price and 1-2mph.

I’f you add height you add to the CofG, you will change the handling characteristics. Probably Ok in every day leisure life but it will be notable. The higher the bracket goes the less Strength they have.

Is there another option?
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Old 21 February 2021, 07:39   #7
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Country: Ireland
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Quote:
Originally Posted by beerbelly View Post
i bought some on ebay to fit my xl shaft outboard to a new humber hull but in the end i fitted a new correct length outboard and sold them on .just didnt feel right on a brand new hull. ( well thats my excuse to the mrs for buying a brand new outboard )


Think you made the right decision there. That arrangement would look horrendous on any transom.
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Old 21 February 2021, 12:29   #8
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I use one with an ETEC 150, I have the same use case as you do. Works perfectly very easy to fit and allows you to use an XL shaft on an L transom. I haven’t noticed any change in handling.

As stated above they are rated to 300 hp V8.
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Old 21 February 2021, 12:56   #9
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Quote:
Originally Posted by Superjetjim View Post
I use one with an ETEC 150, I have the same use case as you do. Works perfectly very easy to fit and allows you to use an XL shaft on an L transom. I haven’t noticed any change in handling.



As stated above they are rated to 300 hp V8.


If you’ve any pictures that would be great
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Old 21 February 2021, 13:21   #10
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I just use a flat sheet of 15mm thick Aluminium plate on my RIB to use an XL shaft engine.
The transom had been cut for a Long Shaft engine when I brought the boat many years ago, but it just kept getting swamped.

The bottom engine mounting bolts go through the plate and transom, where the bolts are in the images, and the top moiunting bolts just go through the plate.

I've had no issues with this system holding my old DT200EFI on for years, even in some pretty rough weather, and I've just rebuilt it for the 225 Opti I'm installing.

You can really spread the load out across the transom with widely spaced bolts.
All the bolts that can't be seen under the transom cover have 6in diameter 3mm thick Stainless pads behind them.

Nasher.
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