[C320-list] [SPAM] Re: Boat Speed

[Chris Burti]

I would bet on the tach being wrong and the engine being out of alignment.
If the engine is not properly aligned, the resulting vibration of the shaft
makes it sound like it is laboring. 4000 rpm just isn't likely. I would
first beg/borrow an optical tach and check out the actual readings and it is
always a good idea to check out your shaft alignment.



On Tue, Jul 7, 2009 at 7:25 AM, Rick Evans <ericstillwellevans at gmail.com>wrote:

> Sounds like under propped
> Sent via BlackBerry from T-Mobile
>
> -----Original Message-----
> From: "pjaarch" <pjaarch at verizon.net>
>
> Date: Tue, 07 Jul 2009 07:19:59
> To: <C320-List at Catalina320.com>
>  Subject: Re: [C320-list] [SPAM] Re:  Boat Speed
>
>
> I sanded the bottom and cleaned the prop.  We are cruising now so the boat
> is loaded down but so are the others I am with.  I did notice that during
> the sea trial, the boat was run at near 4000 rpms for just a minute.  If
> the
> engine is rated at 3400 rpms, should the engine run that much faster?  It
> could be a tach problem, but the engine sounds right at 2700-2800.  Over
> that, it sounds like its really working hard.  The boats I am with are all
> running about 2400 to stay with me which is well under there cruising
> speed.
>
> Paul Adison
> C320 #722
> "Rough Draft"
> riginal Message -----
> From: "Rick Evans" <ericstillwellevans at gmail.com>
> To: <C320-List at Catalina320.com>
> Sent: Monday, July 06, 2009 8:08 PM
> Subject: [SPAM] Re: [C320-list] Boat Speed
>
>
> > Paul
> >
> > I have number 724 and last year with a crappy bottom she would still get
> > 5.5 sometime 6knts depending on wind, current etc.
> >
> > This year I scraped all old paint put on VC offshore and wet sanded with
> > 400grit and took a wire brush to the prop to insure a smooth surface. The
> > other day I was out in a slack tide and at around 2700 she was doing
> > 7knts. This is through the water not over ground on gps. I only have a 2
> > blade prop.
> >
> > In any event dirty bottoms and gunked up props could easily be the cause
> > of slow speeds. When I first bought the boat the surveyor took it for a
> 20
> > mile jaunt to pull her out of the water he said she wouldn't do better
> > than 5knts. When they pulled her the bottom was a mess and the prop
> looked
> > like a barnacle factory.
> >
> > If you just bought her was she surveyed? Was the bottom and prop clean?
> >
> > Rick 724
> > ------Original Message------
> > From: pjaarch
> > Sender: c320-list-bounces at lists.catalina320.com
> > To: C320-List at Catalina320.com
> > ReplyTo: C320-List at Catalina320.com
> > Subject: [C320-list] Boat Speed
> > Sent: Jul 6, 2009 5:39 PM
> >
> >
> > I just purchased my 320 several weeks ago and am concerned about the boat
> > speed while under power.  I have a 3GM30F and cruise at about 5.4 knots
> at
> > 2700RPMs.  It seems slow to me.  I am currently cruising with other
> boats,
> > a (hunter 28, beneteau 331, and an Irwin 38.)  They all cruise easily 6
> > knots at 2700 RPMs and I can't keep up.  I have a 3 blade prop.  Could I
> > be under proped?  What is the cruising RPMs for the boat?  I have no ID
> > plate on the engine block.  I assume it is rated for 3400.
> >
> > Paul Adison
> > C320 #722
> > "Rough Draft"
> >
> >
> > Sent via BlackBerry from T-Mobile
>
>


-- 
Chris Burti Farmville, NC