[Public-List] Prop Questions

Tue Mar 15 21:15:54 PDT 2016

Hi Bob,

I did my cutlass bearing last winter/spring, and took the opportunity to
make sure the shaft was straight (it wasn't; I have a friend with a
reference flat granite slab, rolled the shaft along it, and saw a gap
form under the middle of about 1-2 thou each revolution). I sent the
prop with the shaft to the machine shop that was going to make me up a
new shop (to make sure I hadn't incorrectly identified the taper), and
they recommended that it be reconditioned. I agreed, since it was in
much rougher shape than the condition you're describing your prop being
in, and when I got it back, it took a *very* careful inspection to
establish that they hadn't simply sent me back a brand new prop for the
cost of a recondition.

The short story is that a good marine machine shop will basically work
miracles when asked to recondition a prop. (And if the non-marine
machinists who I know are any indication, a good machinist who doesn't
normally do marine work will direct you to a marine shop about as
quickly as a patent lawyer will send you elsewhere if you call up
asking for criminal defense.)

I had my prop done my United Prop and Machine up in Orillia, in case any
great lakes folks are interested, but I suspect they might be a bit far
afield for you.

-Kris

On Tue, Mar 15, 2016 at 08:53:23PM -0400, Bob Bohmer via Public-List wrote:
> George,
>    I'm new to most of this as i started sailing a couple seasons ago. I've
> gotten two opinions about the current prop. They were both very experienced
> sailers / mechanics. They were of different opinions.Since i have it out to
> redo the bottom and the cutless bearing needs replacing, the prop needs to
> come off. So i thought i would go new and keep the old one as an emergency
> spare. It has a chip at one end and has spotty discoloration. I wasn't
> aware that they could be rebuilt. #76 is kept in Gloucester, Va ( I live in
> Richmond ) and im still having trouble finding A-30 specific knowledge and
> support locally.
> On Mar 15, 2016 8:38 PM, "George Dinwiddie via Public-List" <
> public-list at lists.alberg30.org> wrote:
> 
> > Bob,
> >
> > On 3/15/16 8:23 PM, via Public-List wrote:
> >
> >> I read somewhere on the list that the prop on an A30 with the Gray
> >> Marine 4 cyl. was a 13 / 9 (  2 blade ). This seems to be what I have
> >> on #76. I am unable to confirm the 9 pitch, but assume it is that.
> >> The name Michigan Wheel is mentioned on the maintenance pages as a
> >> source for a new prop. They don’t have one ( 13 / 9 ) with a 7/8”
> >> prop bore, but they sell a Nylon Bore Reducer with it. I also seem to
> >> remember that it is a right hand prop. Can anyone confirm this? Is
> >> there a cheaper source for a quality prop? There is a 5 – 6 week lead
> >> time, so I’d like to get moving on the purchase asap.
> >>
> >
> > Right-hand sounds right, but I've got an Atomic 4.
> >
> > Have you investigated getting your prop rebuilt?
> >
> >  - George
> >
> > --
> >  ----------------------------------------------------------------------
> >   When I remember bygone days                         George Dinwiddie
> >   I think how evening follows morn;            gdinwiddie at alberg30.org
> >   So many I loved were not yet dead,           http://www.Alberg30.org
> >   So many I love were not yet born.                          also see:
> >                'The Middle' by Ogden Nash     http://idiacomputing.com
> >  ----------------------------------------------------------------------
> >
> >
> >
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-- 
Kris Coward					http://unripe.melon.org/
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