[Rhodes22-list] High thrust engine-transom

[Robert Skinner]

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
> 
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-- 
Robert Skinner  "Squirrel Haven" 
Gorham, Maine         04038-1331
s/v "Little Dipper" & "Edith P."