[C320-list] Prop Info

[John Van Vessem]

To All,

I hate to sound stupid, but,  how do you adjust the tach??
 
John Van Vessem
Sojourn 645
Vallejo Yacht Club



----- Original Message ----
From: Robert E. Sloat <resloat at comcast.net>
To: frpoint at earthlink.net; C320-List <c320-list at catalina320.com>
Sent: Thursday, November 9, 2006 10:32:35 AM
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.org
>  [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
>
>
>
>
>
>
>
>
>