[C320-list] Prop Info

[Stanley Rogacevicz]

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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