[C320-list] Prop Info

[Jeff Church]

Bob,

Stop by next season and you can borrow mine if you want to. 

Jeff
  ----- Original Message ----- 
  From: Robert E. Sloat 
  To: frpoint at earthlink.net ; C320-List 
  Sent: Thursday, November 09, 2006 12:32 PM
  Subject: Re: [C320-list] Prop Info


  What a great tip.  I don't think there is any problem with my tachometer, 
  but will do this experiment just for the fun of it. And adjust if necessary.

  Bob Sloat
  Savannah #894
  ----- Original Message ----- 
  From: <frpoint at earthlink.net>
  To: "C320-List" <c320-list at catalina320.com>
  Sent: Thursday, November 09, 2006 12:27 PM
  Subject: Re: [C320-list] Prop Info


  > you can use a florescent light. paint a single line on the front pulley of 
  > your engine.
  > while shining the florescent light at the pulley slowly rev the engine. at 
  > 1800 rpm you should see 4 stationary lines adjust the tack at the binnacle 
  > to read 1800 rpm. note: use a shore power light, not 12 volt.
  >
  > ----- Original Message ----- 
  > From: "Bob & Bel Harrison" <b_harrison at shaw.ca>
  > To: "'C320-List'" <c320-list at catalina320.com>
  > Sent: Thursday, November 09, 2006 10:16 AM
  > Subject: Re: [C320-list] Prop Info
  >
  >
  > Jeff,
  > I just tried this, and got to maybe 4050 in neutral.  I was aware that it
  > wasn't supposed to go that high, which was the reason we asked the 
  > mechanic
  > to check the tach.  No hobby shop around here has heard of such a thing as
  > an optical tach, and neither have the auto parts stores, at least under
  > $400.  My bicycle computer does basically the same thing and a lot more 
  > for
  > about $30, so I don't know why a handheld tach should be any different. 
  > EBay
  > has one for $10 plus $40 shipping, so I'll try a few more places here
  > (Vancouver, BC).
  >
  > Bob H.
  >
  > P.S.  After 3 summers, the boat has ~1050 engine hours, so we've probably
  > used more oil for oil changes than Ken D. uses in diesel ;-).  We're at 90
  > days on the water so far, but it looks like we won't quite make 100 this
  > year, as the ski season starts in a couple of weeks!
  >
  > -----Original Message-----
  > From: c320-list-bounces at catalina320.com
  > [mailto:c320-list-bounces at catalina320.com] On Behalf Of Jeff Church
  > Sent: Tuesday, November 07, 2006 7:41 PM
  > To: C320-List
  > Subject: Re: [C320-list] Prop Info
  >
  > Bob,
  >
  > I can't even get to 3900 in neutral, but the maximum no-load rpm spec is
  > 3850 so maybe your tach is off. If you want to check it, you can buy a
  > optical tach at a hobby shop for $25.
  >
  > I spoke with a different MaxProp tech today and got a different answer
  > regarding the correct pitch. This guy says 16 degrees would be a good
  > setting for cruising conditions. I knew if I called enough I'd eventually
  > get the answer I was waiting for.
  >
  > I'm surprised that there aren't more MaxProp owners on this mail list!
  >
  > Jeff
  >  ----- Original Message ----- 
  >  From: Bob & Bel Harrison
  >  To: 'C320-List'
  >  Sent: Tuesday, November 07, 2006 9:01 PM
  >  Subject: Re: [C320-list] Prop Info
  >
  >
  >  My transmission ratio is 2.62.
  >  We can reach 3900 RPM, but it starts to heat up very quickly over 3300, 
  > so
  >  we usually motor for long stretches around 2800.  Only if necessary, of
  >  course.  Once in a while we run at high RPM for 5 minutes or so, as 
  > Yanmar
  >  recommends.
  >  It sounds like we both should re-pitch - - yours lower and mine higher.
  >
  >  Bob H.
  >
  >
  >  -----Original Message-----
  >  From: c320-list-bounces at catalina320.com
  >  [mailto:c320-list-bounces at catalina320.com] On Behalf Of Jeff Church
  >  Sent: Tuesday, November 07, 2006 2:46 PM
  >  To: C320-List
  >  Subject: Re: [C320-list] Prop Info
  >
  >  Bob,
  >
  >  Thanks for the information.
  >
  >  You have more pitch than me and yet you are running at a higher rpm than 
  > I
  >
  >  am. Do you know what your transmission ratio is? If yours is 2.62 that
  > would
  >
  >  explain the difference between your rpm and mine. I believe Catalina used
  > a
  >  couple of different ratios.  I have the 2.21 transmission and with 18
  >  degrees of pitch I turn 3500 rpm at 7+ knots in flat calm conditions.
  > Also,
  >  what is the maximum rpm you can get at full throttle?
  >
  >  My current pitch is OK for day-sailing, but I'm considering re-pitching 
  > to
  >
  >  16 degrees so I can still get 3500 to 3600 rpm under less than ideal
  >  cruising conditions such as fully loaded boat, fouled bottom, headwinds
  > and
  >  big seas. When I go on a long cruise those are the usual conditions when 
  > I
  >
  >  would need to motor near full speed. As currently pitched, that kind of
  > load
  >
  >  pulls my max rpm down to around 3000 and the engine gets a bit stressed.
  >  MaxProp thinks I shouldn't need to re-pitch, Yanmar thinks I should.
  >
  >  Jeff
  >
  >
  >  ----- Original Message ----- 
  >  From: "Bob & Bel Harrison" <b_harrison at shaw.ca>
  >  To: "'C320-List'" <c320-list at catalina320.com>
  >  Sent: Tuesday, November 07, 2006 11:51 AM
  >  Subject: Re: [C320-list] Prop Info
  >
  >
  >  Earlier this year we installed a 15" Three Blade Classic Max-prop to
  > replace
  >  a 15x9 3-blade fixed prop.
  >  Engine is a Yanmar 3YM30, standard transmission.
  >  The prop was set to the manufacturer-recommended 10.3 (20 degrees) pitch,
  >  and here are some before & after boat speed measurements...
  >
  >  RPM   Fixed   Max-prop
  >  2300    4.4    4.6
  >  2600    4.85   5.13
  >  2900    5.35   5.65
  >  3200    5.8    5.95
  >  3500    6.0    6.28
  >
  >  It seems to me that since the engine has no difficulty reaching high 
  > RPMs,
  >  the prop could be pitched a little higher, say 11.4 (22 degrees).  I'm
  >  considering changing it at next spring's haul-out, but on the other hand,
  >  why mess with something that's quite satisfactory?
  >
  >  Bob Harrison
  >  Maverick #1007
  >
  >
  >  -----Original Message-----
  >  From: c320-list-bounces at catalina320.com
  >  [mailto:c320-list-bounces at catalina320.com] On Behalf Of Jeff Church
  >  Sent: November 6, 2006 11:06 AM
  >  To: C320
  >  Subject: [C320-list] Prop Info
  >
  >  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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