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  13-footer: CMC 10-inch Setback Jack Plate

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Author Topic:   13-footer: CMC 10-inch Setback Jack Plate
tonka485 posted 06-30-2011 10:04 PM ET (US)   Profile for tonka485   Send Email to tonka485  
I am restoring a 13 footer. This is a fishing boat and my first [Boston Whaler boat]. I [am] really looking forward to using it. I have a rebuilt 30-HP [Evinrude two-cycle outboard engine] with no tilt-trim. I am considering a CMC manual jack plate with a 10-inch setback. I am hoping to get some advice from you guys [about what brand or type of 10-inch setback jack plate to use on a 13-foot Boston Whaler boat]. Price is a factor. Thanks don
Tom W Clark posted 06-30-2011 10:39 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Don -- Have you seen Clark Robert's old 13 on Cetacea page 28? It has a 10" setback bracket:

http://continuouswave.com/whaler/cetacea/cetaceaPage28.html

tonka485 posted 07-01-2011 07:23 AM ET (US)     Profile for tonka485  Send Email to tonka485     
Thanks Tom Thats the look I want. I really like that. My concern is the weight of the jack plate, I think it is 42 pds. and the setback of 10 inches making the bow of the boat ride too high. I see he has mounted a fin on the motor to keep the bow down and I think I will do so as well. I am almost ready to order it, I just was hoping to get some feedback from here. Thanks for responding That picture of his boat may have pushed me over the edge..don
Clark Roberts posted 07-01-2011 07:24 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I used an "Altus" (no longer made?) trim/tilt bracket which made it possible to use a 15" (short) shaft motor on the 20" transom.
thegage posted 07-01-2011 09:07 AM ET (US)     Profile for thegage  Send Email to thegage     
I think 10 inches of setback is a bit much. I use a Bob's Mini Manual Jack Plate with my E-TEC 30 on a 13, and it has about 5 inches of setback. Only weighs 12 lbs. The downside is that it's a bit of a chore to change height, but once it's set it's great. Also relatively inexpensive.

http://www.bobsmachine.com/Products/jackplate_manual.cfm

John K.

thegage posted 07-01-2011 09:09 AM ET (US)     Profile for thegage  Send Email to thegage     
http://www.bobsmachine.com/Products/jackplate_manual.cfm
Powergroove803 posted 07-01-2011 02:28 PM ET (US)     Profile for Powergroove803  Send Email to Powergroove803     
I have a TH marine mini jacker with 4 inches or rise and 3 inches offest(may numbers may be off a little) It was $75 at Bass Pro shops online, weighs about 9 -10 pounds, no adjustment once its affixed, but it suffice for the 13, not tested yet....maybe next week!
dburton posted 07-01-2011 02:39 PM ET (US)     Profile for dburton  Send Email to dburton     
thegage & Powergroove803

How do you handle the curved back of the 13 and the square bracket of the jack plate?

Tohsgib posted 07-01-2011 03:25 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
I would not use a 10" unless using a 15" shaft on a 20" transom. 5-6" is plenty and are around $150.
jimh posted 07-01-2011 04:09 PM ET (US)     Profile for jimh  Send Email to jimh     
Moved to PERFORMANCE.
pcrussell50 posted 07-01-2011 05:49 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
quote:
I think 10 inches of setback is a bit much.

It may be a bit much for good handling and function, but he said he was after the "look" of a 10" setback. If the look is more important than the function, then there is pretty much no other way to get that look than with the real deal. I guess the CMC tilt/setback plate for the smaller horsepower motors could be bolted up to the back of a regular setback plate, to make a total of 10"?

-Peter

tjxtreme posted 07-01-2011 06:11 PM ET (US)     Profile for tjxtreme    
I'd consider something like a CMC PT35 while you are at it... it is 4.5" less setback than you are looking for, but will also add power trim.

It is going to be a pain having to stop and tilt a 30 hp during fishing, especially if it is an additional 10" off the transom.

Dburton- the plate slightly deflects on the curved transom. There is enough space at the hinge such that this is not a problem.

pcrussell50 posted 07-01-2011 07:26 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
I should add that I have a PT130, (the one for the bigger motors), on one of my fast lake boats. It is a VERY nice bit of kit. Still, it is only a 5" setback, only a little more than the 4 1/2" for the model tj referred to, which is the appropriate size for a 30hp motor. I say, if you _really_ want 10" of setback, get the PT35 and stack it behind a basic, static, 5" setback bracket. It will only come to 9 1/2", not 10" but that's pretty darned close to the 10" look you were after.

-Peter

tonka485 posted 07-01-2011 07:46 PM ET (US)     Profile for tonka485  Send Email to tonka485     
Thanks to all. I am rethinking the 10 inch setback. I'm thinking more in the 5 inch range now....I was just needing a little advice and I was fortunate to get that here. Is the curve in the transom of any concern?
thegage posted 07-02-2011 05:29 PM ET (US)     Profile for thegage  Send Email to thegage     
quote:
thegage & Powergroove803
How do you handle the curved back of the 13 and the square bracket of the jack plate?

I used composite shims.

John K.

tjxtreme posted 07-02-2011 07:24 PM ET (US)     Profile for tjxtreme    
See my earlier post- the curve is not a concern.

I did not shim, the CMC unit deflected slightly but does not seem to add any strain to the hinge or other parts of the unit.

Tohsgib posted 07-04-2011 01:13 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Never had any problem with the curved transom, couple gaps her and there...who cares. Since you have seen the light ;) go with the CMC PT35 or 130 and you will make that boat come alive with PTnT. My Whaler with 40hp OMC would do about 32ish at a set trim, with a CMC 130 PTnT it bumped it up to 37+.
Powergroove803 posted 07-06-2011 11:21 AM ET (US)     Profile for Powergroove803  Send Email to Powergroove803     
Qoute

"thegage & Powergroove803
How do you handle the curved back of the 13 and the square bracket of the jack plate?"

the curve was no problem, it deflected slightly and I diid not shim it. I did put 8 3/8" bolts in it just for my own personal obsession that I wouldn't drag it down the highway...

Powergroove803 posted 07-06-2011 11:24 AM ET (US)     Profile for Powergroove803  Send Email to Powergroove803     
One more thing, the more you lever it off the back, and with an addition of a 4 stroke, you may want to think about moving your console forward to compensate for the weight shift.
My buddy put a 4 stoke 25 Yamaha on his 13 and he is complaining about the weight placement, I think he is moving everything forward one foot.
Binkster posted 07-08-2011 11:15 PM ET (US)     Profile for Binkster  Send Email to Binkster     
Below is a post I made on a similar thread a couple of years ago. Also if you go to the GAM section and find the thread entitled "Climbing into a 13 footer" and scroll down to my post it will show a picture of a ladder I modified and installed, and it also shows a closeup of the homemade 6" setback bracket I built. It was a very simple project.

Here are plans for a home made bracket that has been used on the racing circuit for the past 3 years.This is the bracket I`m running my 4 stroke 25 Merc on and it has proven itself to me. It gives you a 6" setback. Of course its not as convenient, as one with a single bolt you can turn out on the water. The boat must be on a trailer and the motor is raised up or down with a jack. I have run every conceivable position from the cav. plate 1" above the water to 1/2" below the water. The ideal setup seems to be running the plate just so it is barely dry.
Here are the plans to Bob Dillons Jackplate. It is good for 35hp OMC.

http://www.dillon-racing.com/jackplate/index.htm

The only change I made is to bolt a piece of 1/4" aluminum plate behind the motor board, making it a one piece unit. If you don`t want to attempt to do it yourself, a machine shop could build it for a few bucks. If I had a boat with a big V6 I would still build my own. Still very simple. All is needed is 2 pieces of 16" X 4" X5/8" channel aluminum, This would be a one piece jackplate built on the same principle as Bob Dillons bracket. On a radiused transom, you would need two aluminum shims to fill in the space on the outside of the bracket. This would be overkill with any outboard.

rich/Binkie

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