[C320-list] Prop Info

[Len]

Well, my indicated max rpm of 3250 is actually 3600, calm water in channel
either way, and speed is 7.2 Kts; at recommended cruising of .75% of max
3800rpm, 2850rpm actual (2500 rpm indicated), speed is 6 Kts.
Plan to recalibrate engine tach soon.
Len
Aqua5  #1070


On 11/11/06, Adam Weiner <esquirecatering at rcn.com> wrote:
>
> Yes, well talk is cheap and that's why I want to try it.  I have a fixed
> two bladed.  Adam
>
> -----Original Message-----
> From: c320-list-bounces at catalina320.com
> [mailto:c320-list-bounces at catalina320.com] On Behalf Of Stanley
> Rogacevicz
> Sent: Thursday, November 09, 2006 12:58 PM
> To: 'C320-List'
> Cc: CraigEneboe at aol.com
> Subject: Re: [C320-list] Prop Info
>
>
> Adam,
>   That 'drag race' or even just driving a 3 blade would show you the
> difference I think. This may fall into the 'you don't miss what you
> never had' category. The way I went back an forth between props showed
> me the difference - I bought my c320 in the fall with a fixed 3 blade
> and after only a couple months of sailing it was on the hard for 6 mind
> and body numbing months of winter during which I switched to a 2 blade
> Martec folder. In the Spring the power seemed fine since everything is
> new and different each spring for us. I felt vibration that bothered me
> (which was minor and just my paranoia - later confirmed by driving
> someone else's), did a short haul, and put the 3 blade back on. I pulled
> out of the marina hit the throttle and   Whoa... baby what a difference
> !!. It's that low speed torque you get from the extra square inches of
> surface that you notice when in drag racing terms you are 'climbing out
> of the hole'. Once you get that 12,000 lbs moving at a few knots it's
> all the same but it comes into play again when wind and waves are
> pushing you back. Stan formerly "Christy Leigh" c320 #656
> Wickford/Narragansett Bay RI
>
> >>> "Adam Weiner" <esquirecatering at rcn.com> 11/9/2006 12:27 AM >>>
> OK, know you guys have my curiosity up.
>
> Anyone in SF Bay Area with a 3 bladed fixed prop who would like to take
> me out for a spin?  I won't to see what (my two bladed) is slipping on
> and not biting.  What about someone with a folding prop?
>
> What about a little match racing (although that would be hard to compare
> because of different sails, etc.)  Perhaps an acceleration race and a
> drag race at 2000 RPM's.
>
> Adam
>
> -----Original Message-----
> From: c320-list-bounces at catalina320.com
> [mailto:c320-list-bounces at catalina320.com] On Behalf Of Jeff Church
> Sent: Wednesday, November 08, 2006 7:09 PM
> To: C320-List
> Subject: Re: [C320-list] Prop Info
>
>
> Ken,
>
> Thanks for the information, but I'm not sure if I should compare the 2
> and 3 blade props. I'd guess that the 2 blade has more slip, less bite.
>
>
> Thanks.
>
> Jeff
> ----- Original Message -----
> From: K L
> To: c320-list at catalina320.com
> Sent: Wednesday, November 08, 2006 8:24 PM
> Subject: Re: [C320-list] Prop Info
>
>
> Jeff:
>
> Grace has the Yanmar engine (3GM30F) with a transmission ratio of
> 2.21. The
> two-blade 15 inch Max Prop has the pitch set at 20 degrees. The prop
>
> installation and adjustment was done by a very reputable boat yard in
> the
> bay area (KKMI).
>
> I don't know about maximim spreed. I generally motor at 2600-2800 RPM
> and
> that moves the boat at about 6.5 kts.
>
> Ken Danko
>
>
>
> >From: "Jeff Church" <jjemail at comcast.net>
> >Reply-To: C320-List <c320-list at catalina320.com>
> >To: "C320" <C320-List at catalina320.com>
> >Subject: [C320-list] Prop Info
> >Date: Mon, 6 Nov 2006 13:06:14 -0600
> >
> >The boats on the hard and I'm working thru my winter project list.
> I'm
> >about to re-pitch my MaxProp and I'd like to know what pitch other
> 320
> >owners are using. MaxProp's database is out of date. They only list
> the
> >C320 with a Perkins diesel.
> >
> >If you have a MaxProp and a Yanmar please let me know the pitch,
> >transmission ratio, and your maximum speed and RPM while motoring.
> >
> >Aside from taking the results into account for my use, I'll update
> MaxProp
> >with the information.
> >
> >Thanks
> >
> >JeffC
>
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