[Rhodes22-list] Motor Mount

Wed Jun 3 07:15:14 EDT 2020

Hi Ric,

S/V Dynamic Equilibrium originally had a parallelogram linkage style motor mount.  It worked OK.  But, before you buy, consider two major disadvantages of this style motor mount.

One, the parallelogram linkage has a number of heavily loaded pivot points.  On my motor mount, these pivot points were made from some sort of riveted bushings.  They had no provision for lubrication and so had a tendency to wear and get sloppy.  The GBI motor mount has no such built-in wear points.  This pivot wear was the primary reason I decided to replace my motor mount back in 2010.  But, replace it with what?

Which brings me to disadvantage #2.  By design, the parallelogram linkage moves the motor out away from the transom as well as down.  So what you may ask?  Well, at least on S/V Dynamic Equilibrium, this outward movement ended up putting the motor’s lower unit right in the bottom of the trough of the stern wave.  i.e. The stern wave’s trough caused the lower unit to be less submerged than it could have been if the lower unit were closer to the transom.  This made the outboard more susceptible to cavitation in heavy weather.  Note, that I also have an extra long shaft Honda outboard (25”) to help with this same issue.  The GBI motor mount allows the lower unit to be as deep as possible and as close as possible to the transom as any motor mount on the market today.  The GBI motor mount also allows the vertical position of the motor to be adjusted.  i.e. You can adjust it to be very deep to prevent cavitation when motor sailing on port tack and then raise it up to prevent the motor’s upper unit from taking on water on starboard tack.  In the picture of S/V Dynamic Equilibrium’s stern that you have been referencing, the motor mount is shown in the fully lowered position.  Note how far below the waterline stripe the motor’s lower unit is.  In heavy conditions, often the only way to make progress to windward is to motor sail.  The combination of a GBI motor mount and an extra long shaft outboard, gives S/V Dynamic Equilibrium significantly more heavy weather capability vs. when it had the old parallelogram style motor mount.  Another GBI motor mount advantage is the built-in 6:1 block and tackle, which makes raising and lowering the motor almost effortless.  The GBI motor mount is a well engineered, well built piece of gear.

Stan, you can send my sales commission to my home address!  😉

Roger Pihlaja
S/V Dynamic Equilibrium

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Richard Stott<mailto:ric at stottarchitecture.com>
Sent: Tuesday, June 2, 2020 6:01 PM
To: The Rhodes 22 Email List<mailto:rhodes22-list at rhodes22.org>
Subject: Re: [Rhodes22-list] Motor Mount

Hey Mike
Thanks for the research and the drawings.
The lift on Dynamic Equilibrium is what I have seen and remembered.
I have tried to buy this from Stan, but he told me I’d have to bring the boat to Edmonton to have it installed.
Not sure why.
It looks robust and permanent, but it also looks overly large and cumbersome for operating the motor with the tiller.
I’m thinking that this West marinate bracket will do the trick.
It has a 16” vertical trail which allows the motor to lift all the way above the waterline without tilting it and all the gear moves with the motor so there is nothing in the way of steering or reaching controls.
Has anyone chosen this ‘dark side’?
Any reports on after market /non-GB mounts?
Thanks Ric

Richard Stott, AIA, LEED AP
www.stottarchitecture.com<http://www.stottarchitecture.com>
Office  631-283-1777
Cell            516-965-3164

> On Jun 2, 2020, at 5:40 PM, Michael D. Weisner <mweisner at ebsmed.com> wrote:
>
> Ric,
>
> I'm not sure what you are looking to build in the way of a motor mount.
>
> I searched the archives and found a photo of an GB design on Roger's Rhodes from a 2019 post at:
> http://rhodes22.org/pipermail/rhodes22-list/attachments/20190526/bf33e9c5/attachment.jpg
> and
> http://rhodes22.org/pipermail/rhodes22-list/attachments/20190526/97a8a159/attachment.jpeg
> Maybe Stan can ship you one.
>
> Way back in 2007, Jay Bulfer nearly lost his motor while trying to beat out a storm. s/v Just Bent's engine mount had failed. He provided the attached drawing and reconstructed the mount using stainless steel (he is a metal fabricator at jbtek.com).
>
> My GB motor mount looks a lot like yours with the exception of the wood (see photos added at the end of the message).
>
> Mike
> s/v Wind Lass ('91)
> Nissequogue River, NY
> I’d rather be sailing :~)
>
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