[C320-list] Prop Info
Len
aqua5len at gmail.com
Thu Nov 9 16:50:00 PST 2006
With the optical tach, you put a piece of reflective tape on the flywheel
and point the beam ; it reads the rpms as the flywheel spins---so don't jump
in the water.
Len
On 11/9/06, Kirk McCullough <kirk.mccullough at telus.net> wrote:
>
> Its for a model airplane of course, their props aren't usually submersed.
> :)
>
> Kirk
> Boomerang #124
> ----- Original Message -----
> From: <Orlando.Duran at AveryDennison.com>
> To: "C320-List" <c320-list at catalina320.com>
> Sent: Thursday, November 09, 2006 11:44 AM
> 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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