[C38] Vibration

[Max Soto]

Kerry,I have the same prop and always had that vibration no matter how well
aligned my engine is and prop is perfect.  I don't have a flexible coupling
yet, and I think that will make a great improvement. I have 1 1/4"  between
the strut and the prop. When I just bought the boat and moved to my slip the
guy that cleaned the prop left a line on the water that no one else saw. It
got caught by the prop, bent the strut and broke the shaft, so, I also had
work done on the strut and Can't tell if there was a vibration before.

Max Soto
C38 #198 ESTANCIA
Puntarenas, Costa Rica


2009/7/8 <littlebreeze at comcast.net>

> I'm sorry, I should have mentioned that the prop is the factory fixed two
> blade prop.
>
> Kerry
>
> ----- Original Message -----
> From: "Bob Porter" <hiawatha at localnet.com>
> To: "Catalina 38 Listserve" <listserve at catalina38.org>
> Sent: Wednesday, July 8, 2009 2:45:07 AM GMT -08:00 US/Canada Pacific
> Subject: Re: [C38] Vibration
>
>  Is there anything that could have changed the balance of your prop. I
> has a martec folding prop with a slight imbalance and it caused quite a
> vibration, dependent on speed.
>
> Bob Porter
>
> ----- Original Message -----
> *From:* littlebreeze at comcast.net
> *To:* Listserve, Catalina <listserve at catalina38.org>
> *Sent:* Wednesday, July 08, 2009 2:12 AM
> *Subject:* [C38] Vibration
>
> I recently had my boat in for a bottom job.  While there the strut was
> found to be loose.  I had the strut repaired and now there is a vibration.
> At first the vibration was so violent to broke the hose clamps on the
> packing gland hose.  Then the engine was realigned and most the vibration
> was gone.  The vibration which is left is still enough to vibrate the
> steering pedestal.  When I bought the boat 5 years ago I brought it up the
> coast on the motor and there wasn't a vibration and when I took to have the
> bottom repaired there wasn't a vibration.  Now it is logical to believe that
> the vibration was there you just couldn't feel it because the strut was
> loose and now that it is rigid again you can feel the vibration.  The other
> thing which is of concern is that the propeller is mounted within 1/4 inch
> of the strut, but there is another Catalina 38 in the same yard and the
> propeller is approximately 1 foot from the strut.  (of course is has been a
> month and I did not measure the distance between the strut and the prop).  I
> think there could be a correlation between the location of the prop/strut
> and the vibration.
>
> So I have several questions.  First, for those of you who have had you
> boats out of the water recently, what is the distance between your prop and
> the strut.  Second, any Ideas on the vibration?  Third, I know some of you
> have had to deal with vibrations in the past, what have you done to rectify
> your problems?
>
> Kerry Grimes
> Littlebreeze, 139
> San Francisco
>
>
>
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