[alberg30] Re: Motor mounts/Thrust Bearings

[sunstone]

From: sunstone <sunstone at idirect.com>

Rabbit 649:

I'm listening to you, but now you know how Cassandra felt seeing her
prophesies go unheeded.

I have an A-37 Mk1 with a Westerbeke 4-107 and I'm not sure if I have
the room between the stuffing box and the rear flange, it's no more than
6".  I'll have to check when I pull the tarp off next week - hurrah
finally!

The engine generates a max. power of 40 hp but in reality if I'm using
much more than 18 hp on the curve I'd be suprised.  Interestingly I'm
turning a 2 blade 13x9LH, no bigger than my old A-30 and I'm perfectly
happy with the performance other than the oil leaks, go through about 4
or 5 litres of oil a season over and above the oil changes.

Question, if I have room to mount this bearing will I be able to get a
good epoxy bond if the boat is in the water if I wait until the water
temperature and air temp are close to reduce/eliminate condensation on
the hull?

The other question is how robust should the bearing be?

Thank you in advance.

Fair winds,

John Birch, Sunstone KC-65
RABBIT649 at aol.com wrote:
> 
> From: RABBIT649 at aol.com
> 
> I have great ideas and nobody ever listens to me.
> FORGET the engine mounts: Put in a thrust bearing on short cross member
> glassed to the hull. The prop transmists the force of reaction against the
> water via the driveshaft directly through the thrust bearing to the
> crossmember>to the hull. On the forward side of the crossmember a PSS flexible
> coupling, essentially a marive CV joint, allows up to a %15 degree
> misalignment of the engine with the prop shaft. But due to the Thrust
> bearing/crossmember arrangement, there will be no force driving the boat
> against the engine itself.
> You can mount the engine on JELLO. It won't matter.
> 
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