[Rhodes22-list] High thrust engine-transom

[Mary Lou Troy]

Not only does the GB motor mount distribute the load (I think) 
differently, I think the load is different because we don't need to 
tilt the motor (always lift it straight up and down). I suspect that 
a motor on a standard off the shelf mount acts like a lever working 
on the transom. That being said we are going to inspect the mount today

Mary Lou
1991 Rhodes 22  Fretless
Rock Hall, MD

At 03:44 AM 9/24/2007, you wrote:
>
>Robert,
>
>The new motor lift maybe more helpful in managing the outboard, however  it's
>ability to further distribute sudden extreme outboard motor impact on too
>thin fibreglass that may surround the mount I would suspect will 
>still yield an
>intact outboard motor fibreglass sandwich leaving that hole around that
>mount. I  believe that increasing the capacity/surface area of the 
>backer plate/s
>will  significantly help without the exterior aluminum plate. I installed the
>exterior  aluminum plate due to my belief that much of the remaining transom
>glass was  thin and was filled with stress fractures following the "accident
>tearing free "  of the mount.
>Burt
>
>
>
>In a message dated 9/23/2007 11:14:00 P.M. Eastern Daylight Time,
>robert at squirrelhaven.com writes:
>
>Thanks  for the info, Burt.  That helps a lot.
>
>I suspect that the new  motor lift not only helps
>manage the motor, but also distributes the load
>over a larger area.  Stan's evolutionary
>engineering  again!
>
>Did you paint the aluminum to match the  hull?
>
>/Robert
>
>ASNOOCH at aol.com wrote:
> >
> >
> >  Robert, I would suggest that you consider Stan's recommendation 
> to use  the
> > minimal amt. of Hp to get up to hull speed... unless you consider  a beef
>up....
> >
> > I will attempt in during the next few days to  take a stern photo....
>however
> > she is dockside.... anode is  below water level...
> > To control cost, weight and ease of  construction.... I placed the aluminum
> > plate on the outside. It  covered the entire port half of the stern..and
>matches
> >  it's  configuration. . It has been epoxy laminated to the stern 
> and through
> >  bolted. I selected standard marine circular center bolt sacrificial
>anodes.
> > Two  were attached to the plate below the water  level.
> > I felt it was additionally important to internally brace 
> the  entire transom
> > with marine laminated 1inch plywood braces to further  distribute any
>stress.
> > Sure has provided a very comfortable  feeling...  I believe the engine
>thrust
> > flexing is only a  mild indication of the relative strength of 
> the transom
>to
> >  stress....the force of my engine's weight sitting up and out of the
>water is
> > the real "testor".  Now a heavier , 4 
> stroke  most  probably  would magnify
>the
> > possible problem.... I'm surprised I  have not heard of this  occurring
> > before.... perhaps I had an  especially thin fiberglass  transom...  Burt
> >
> > In a  message dated 9/23/2007 9:30:43 P.M. Eastern Daylight Time,
> >  robert at squirrelhaven.com writes:
> >
> > ASNOOCH at aol.com  wrote:
> > > ... My fibreglass repair brought
> > >   the  thickness up to over 1/2 inch, plus
> > > more than double  the  backing. On the
> > > outside  of the stern, was cut a  1/4 inch
> > >  aluminum plate in the shape of the
> > >  stern, to  which I attached  sacrificial
> > > metal plates ,  and both epoxy and bolted
> > > the  plate  to the  stern...
> >
> > I too have a little flex in my stern by my   motor mount,
> > so some questions, if you please:
> >
> >  Aluminum plate on  the OUTSIDE of the stern?
> >
> > How big,  what shape, where  mounted?
> >
> > Bolted thru to a plate on  the inside?
> >
> > Where, what kind  of sacrificial  plate?
> >
> > Any pictures?
> >
> > Thanks for any   info/help!
> >
> > /Robert
>
>
>
>
>
>
>
>************************************** See what's new at http://www.aol.com
>__________________________________________________
>Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.488 / Virus Database: 269.13.30/1025 - Release Date: 
>9/23/2007 1:53 PM