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Author Topic:   Purpose of Set Back Brackets

djreichenbach posted 05-27-2007 09:11 AM ET (US)
I see a lot of people using [set back brackets] on Montauks. I have a 1975 Montauk with an 1989 90-HP Mercury mounted on the transom. What would be the purpose of putting [the motor] on a set back bracket? How much does a project like that cost? I probably couldn't do it myself. Any thoughts? Thanks---Dan
jimh posted 05-27-2007 09:23 AM ET (US)
There is an article in the REFERENCE section on the topic of set back brackets which may contain information you will find of interest:
Engine Brackets
This article describes the improvements gained by mounting outboard engines on setback brackets and how such brackets were offered from Boston Whaler in the period of 1983 to 1993.
http://continuouswave.com/whaler/reference/engineBrackets.html
jimh posted 05-27-2007 09:32 AM ET (US)
The cost of installing a set back bracket is the sum of:
--cost of the set back bracket itself
--labor to remove engine
--labor to install set back bracket
--labor to re-install engine on set back bracket
--cost of any new controls or rigging needed as a result of moving engine
--cost of new hardware such as stainless steel fasteners used to mount bracket to transom and engine to bracket
--cost to clean up hull of any residue from old installation, if needed
There can also be some unforeseen problems which appear in the installation process, such as damage to the hull laminate or interference between existing hardware (such as a transom drain or a ski tow eye bolt) and the new hardware. Repair and resolution of these problems will add to the cost.
jimh posted 05-27-2007 09:43 AM ET (US)
[Moved a second topic originally raised in this discussion to a separate article.]
Teak Oil posted 05-27-2007 09:51 AM ET (US)
Once you get your jackplate, about $200-300, you will need to find out what your local dealer charges to remove and replace your engine, figure about 3 hours labor so probably a couple hundred bucks at least.
Then you may need a new prop to take advantage of the setback provided by the jackplate. You could potentially be looking at close to $1000. I setup my Montauk for about $450 by doing the work myself and buying a used prop off eBay.
contender posted 05-27-2007 05:58 PM ET (US)
Teak oil: why did you have to purchase a new prop? What does the setback change? also how far back did you go? thanks rick
djreichenbach posted 05-28-2007 11:05 AM ET (US)
Jimh,
Thanks. After posting this, I found and read the articles you referenced. Very detailed. I think they answered my questions.
Teak Oil posted 05-29-2007 09:11 PM ET (US)
Contender I needed a prop with more pitch because the jackplate raised the lower unit, reducing drag and allowing my engine to turn more rpms. My 13x19 would over-rev to 6000 rpms, so I went to a 13.5x20 prop.
Unless you are turning your prop at the bottom end of the WOT rpm range, you will probably need to prop up with a jackplate.
jimh posted 05-30-2007 12:39 AM ET (US)
Short set back brackets, or jack plates, can be used to gain advantages other than just performance. In my own case I was motivated to make space in the engine splash well available for a cooler. Being able to move the cooler back to the now empty splash well gave me more cockpit space. The extra weight on the transom was also not a problem because my boat (a REVENGE) was slightly bow heavy in its original set up (and especially so when we had a lot of cruising gear in the cabin). But most of the time people use them to try to gain some performance advantage.

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Author	Topic: Purpose of Set Back Brackets
djreichenbach	posted 05-27-2007 09:11 AM ET (US) I see a lot of people using [set back brackets] on Montauks. I have a 1975 Montauk with an 1989 90-HP Mercury mounted on the transom. What would be the purpose of putting [the motor] on a set back bracket? How much does a project like that cost? I probably couldn't do it myself. Any thoughts? Thanks---Dan
jimh	posted 05-27-2007 09:23 AM ET (US) There is an article in the REFERENCE section on the topic of set back brackets which may contain information you will find of interest: Engine Brackets This article describes the improvements gained by mounting outboard engines on setback brackets and how such brackets were offered from Boston Whaler in the period of 1983 to 1993. http://continuouswave.com/whaler/reference/engineBrackets.html
jimh	posted 05-27-2007 09:32 AM ET (US) The cost of installing a set back bracket is the sum of: --cost of the set back bracket itself --labor to remove engine --labor to install set back bracket --labor to re-install engine on set back bracket --cost of any new controls or rigging needed as a result of moving engine --cost of new hardware such as stainless steel fasteners used to mount bracket to transom and engine to bracket --cost to clean up hull of any residue from old installation, if needed There can also be some unforeseen problems which appear in the installation process, such as damage to the hull laminate or interference between existing hardware (such as a transom drain or a ski tow eye bolt) and the new hardware. Repair and resolution of these problems will add to the cost.
jimh	posted 05-27-2007 09:43 AM ET (US) [Moved a second topic originally raised in this discussion to a separate article.]
Teak Oil	posted 05-27-2007 09:51 AM ET (US) Once you get your jackplate, about $200-300, you will need to find out what your local dealer charges to remove and replace your engine, figure about 3 hours labor so probably a couple hundred bucks at least. Then you may need a new prop to take advantage of the setback provided by the jackplate. You could potentially be looking at close to $1000. I setup my Montauk for about $450 by doing the work myself and buying a used prop off eBay.
contender	posted 05-27-2007 05:58 PM ET (US) Teak oil: why did you have to purchase a new prop? What does the setback change? also how far back did you go? thanks rick
djreichenbach	posted 05-28-2007 11:05 AM ET (US) Jimh, Thanks. After posting this, I found and read the articles you referenced. Very detailed. I think they answered my questions.
Teak Oil	posted 05-29-2007 09:11 PM ET (US) Contender I needed a prop with more pitch because the jackplate raised the lower unit, reducing drag and allowing my engine to turn more rpms. My 13x19 would over-rev to 6000 rpms, so I went to a 13.5x20 prop. Unless you are turning your prop at the bottom end of the WOT rpm range, you will probably need to prop up with a jackplate.
jimh	posted 05-30-2007 12:39 AM ET (US) Short set back brackets, or jack plates, can be used to gain advantages other than just performance. In my own case I was motivated to make space in the engine splash well available for a cooler. Being able to move the cooler back to the now empty splash well gave me more cockpit space. The extra weight on the transom was also not a problem because my boat (a REVENGE) was slightly bow heavy in its original set up (and especially so when we had a lot of cruising gear in the cabin). But most of the time people use them to try to gain some performance advantage.