Re: [Amel Yacht Owners] Bowthruster propeller shaft seal on SM


Alexandre Uster von Baar
 

Good morning Bill,

First time I dove the hub was still on the Delrin Hub (the pin was gone, slide out)

When I put on spare the propeller I put a new pin and new Nylon bold.
I was able to use the bow thruster for 4 burst of 4 second each, then lost it again.

But before I write more in it for now, I want to document the incident, show pictures, etc. explain step by step everything.

Paul, interesting with the propeller being burst apart…

Sincerely, Alexandre



--------------------------------------------

On Mon, 3/21/16, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: [Amel Yacht Owners] Bowthruster propeller shaft seal on SM
To: "amelyachtowners@..." <amelyachtowners@...>
Date: Monday, March 21, 2016, 8:42 AM


 









Alex,
I know that you know this, but you
did not mention the stainless steel pin that
goes through the hub.
If that pin was inserted through the
Delrin® hub and thruster shaft before the propeller was
screwed to the hub, what happened to the
pin??? 
You said that
you found "both propeller with the 6 nylon bol(t)
still attached to it." If the nylon bolts were attached
to the propeller, they had to still be screwed into the hub,
or else, the bolts would fall out...right?
I am confused.
Alex &
Paul,I wonder if there are some
out-of-spec hubs being made and distributed? Do you know the
origin of your hub. I seem to remember that one owner had
some hubs machined out of Nylon rather than Delrin® and
they fell apart rapidly.
Bill
BillBeBe
387
On Mon,
Mar 21, 2016 at 12:46 PM, Alexandre Uster von Baar uster@...
[amelyachtowners] <amelyachtowners@...>
wrote:















 









Good morning Paul,



I haven’t posted the detail on the forum yet, but I found
both propeller with the 6 nylon bold still attached to it…
there was also nothing in the water to cause the failure.


To me it looks like the thread on the hubs holding the nylon
bold failed…

Since I used that same hub and propeller, I don’t think it
is a production issue, but rather an age/ware issue (of the
hub).

By the center part of the propeller burst into pieces, do
you mean the propeller itself? Or (what I call) the hub on
which the nylon screws are bolt on?

Sincerely, Alexandre



--------------------------------------------

On Mon, 3/21/16, osterberg.paul.l@...
[amelyachtowners] <amelyachtowners@...>
wrote:



Subject: Re: [Amel Yacht Owners] Bowthruster propeller shaft
seal on SM

To: amelyachtowners@...

Date: Monday, March 21, 2016, 4:55 AM





 



















Hello!AlexandreI also lost my

bow-thruster propeller after overhauling the whole
thruster

with new bearings and lip seal.When in the water

I used it less than 5 seconds and suddenly the revs went
up

on the motor. There was nothing in the water to get into
the

propellar so I do not know the cause. When taken out the

thurster shaft I found no propellar, but the center
piece

with still three of the nylon screws on. Strange that
means

that the whole center of the propellar that should be
the

most massive part has burst into pieces. Can it be a miss
in

the production?Paul on S/Y Kerpa





















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