[C320-list] Prop Info
Bill Culbertson
billculb_a2 at yahoo.com
Thu Nov 9 16:15:49 PST 2006
I am such a bonehead for never thinking of that. Thanks so much for the suggestion. Now that you mention it, I remember shining a flashlight on the pulley as well.
-bill
----- Original Message ----
From: Jeff Church <jjemail at comcast.net>
To: C320-List <c320-list at catalina320.com>
Sent: Thursday, November 9, 2006 5:20:51 PM
Subject: Re: [C320-list] Prop Info
Or you can put 2 pieces of tape on the pulley and read directly off the display using the 2-prop setting. It helped to shine a flashlight on the pulley as I took the readings.
Jeff
----- Original Message -----
From: Bill Culbertson
To: C320-List
Sent: Thursday, November 09, 2006 2:07 PM
Subject: Re: [C320-list] Prop Info
I thought about doing that but then noticed it was 28 degrees outside here in Michigan and thought it might be uncomfortable.
I put a piece of blue tape on the engine crankshaft pulley and made sure I had bright enough ambient light. Then I pointed at the pulley. Since it is designed for 2, 3 or 4 blade props the number is either 2x, 3x or 4x off. I set it to a 2-blade prop and used a factor of two on the number it displayed.
-bill
----- Original Message ----
From: "Orlando.Duran at AveryDennison.com" <Orlando.Duran at AveryDennison.com>
To: C320-List <c320-list at catalina320.org>
Sent: Thursday, November 9, 2006 2:44:44 PM
Subject: Re: [C320-list] Prop Info
Bill,
The web site said this about the tach:
This handy tuning tool can measure the rpm of any engine equipped with a 2-, 3-, or 4-bladed
propeller. RPM is displayed in up to four digits, with a range of up to 32,000 rpm.
So what do you do, jump into the water and point at the prop? :)
Bill Culbertson
<billculb_a2 at yah
oo.com> To
Sent by: C320-List
c320-list-bounce <c320-list at catalina320.com>
s at catalina320.or cc
g
Subject
Re: [C320-list] Prop Info
11/09/2006 11:38
AM
Please respond
to
C320-List
<c320-list at catal
ina320.org>
This is the one I bought a few weeks ago:
http://h1071671.hobbyshopnow.com/products/description.asp?prod=HAN156
Rider's Hobby shop is local to our area so I walked in and bought one. But
it looks like they do online business as well from the above link.
I was glad to confirm that my engine tach was spot on when I measured with
this new toy.
-bill
----- Original Message ----
From: Bob & Bel Harrison <b_harrison at shaw.ca>
To: C320-List <c320-list at catalina320.com>
Sent: Thursday, November 9, 2006 1:16:07 PM
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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