[C320-list] Autoprop Feedback/dripless shaft seal

[Dick Walker]

It was inserted into the exhaust water and flows overboard. 


Cheers

Dick Walker
740 Olive Ave.
Coronado ,CA 92118
619.435.8986



On May 16, 2013, at 13:53, "Welch, Myron D" <myron-welch at uiowa.edu> wrote:

> Dick,
> 
> I too updated my dripless shaft seal to the newer vented model ( they sent it to me for free!) last year. Where did you route the vent tube? The PYI suggested placement was not good. Thanks. 
> 
> Myron Welch
> Wind Instrument #238
> Iowa City, Iowa
> Grace Memorial Harbor
> Elk Rapids, Michigan 
> 
> Sent from my iPad
> 
> On May 16, 2013, at 11:15 AM, "Dick Walker" <dickwalker at att.net> wrote:
> 
>> When I ordered my year 2000 C-320 I made the following changes TO THE DRIVE
>> TRAIN.  SS PROP SHAFT, FTI DRIPLESS shaft seal and the AUTOPROP.
>> 
>> They really helped the performance and maintenance.
>> 
>> With the autoprop at about 2700 RPM on the Yanmar engine I get hull speed
>> +/- 7.1 kits. I did not have to perform any modifications to the strut.  I
>> use about .6 gallons per hour at 2700 RPM.
>> 
>> After 8 years I changed the dripless shaft seal to the new model that does
>> not need to be burped.
>> 
>> Here is my in water test
>> RPM    2.61 Gear    2.21 Gear
>> 1000    4    2.7
>> 1200    4.7    3.5
>> 1400    5.45    4.3
>> 1600    6    5
>> 1800    6.4    5.6
>> 2000    6.6    6
>> 2200    6.9    6.3
>> 2400    7.2    6.6
>> 2600    7.3    6.7
>> 2800    7.35    6.85
>> 3000    7.35    7.1
>> 3200    7.35    7.2
>> 3400    7.35    7.3
>> 3600 ft    7.35    7.35
>> 
>> Cheers and give me a call if you have any questions
>> 
>> 
>> Dick Walker
>> WindWalkerII #687
>> 619.435.8986
>> 
>> 
>> 
>> -----Original Message-----
>> From: c320-list-bounces at lists.catalina320.com
>> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Brian &
>> Christine Borchers
>> Sent: Thursday, May 16, 2013 8:49 AM
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] AtoProp Feedback
>> 
>> Andrew, 
>> 
>> Thanks for the info regarding the shaft extender.  Is the extender a plate,
>> similar to the coupler? How much extension is needed and what does it look
>> like?  Also, do you know the amount of shaft that is needed following the
>> strut to accommodate the propeller.  Again, thanks for the feedback.
>> 
>> Brian Borchers
>> Sent from my iPhone
>> 
>> On May 16, 2013, at 8:34 AM, Andrew Santangelo <andrew_santangelo at mac.com>
>> wrote:
>> 
>>> Brian,
>>> 
>>> I have had an autoprop on my C320 for the last 15 years - it was my first
>> "major" addition to Dawn Treader.
>>> 
>>> I both cruise and race.  Cruise wise it works excellent in forward and
>> reverse (no prop walk).  The performance under power and the fuel economy
>> significantly improved.  If I recall, I hit hull speed at a lower RPM.
>>> 
>>> Race wise it was one of several key improvements.  I have not raced in the
>> last few years, but when we did we either placed or won.  When first racing
>> as newbs we were dead last always (and I mean last).  After adding the
>> autoprop we moved to the middle of the fleet.  (Later additions include fin
>> keel, hydraulic backstay, racing sails, racing sheets and halyards, etc.).
>>> 
>>> Installation requires a shaft extender.  I forget the name/brand of mine,
>> but it goes between the prop shaft and the engine.  It also suppresses any
>> added vibrations and isolates the prop shaft/prop from the engine (reduces
>> rust?).  Without it, the prop will whack the strut, a definite no-no.
>>> 
>>> 
>>> Andrew Santangelo
>>> 
>>> C320 "Dawn Treader"
>>> #333
>>> San Francisco, CA
>>> 
>>> J22 "Blitzkrieg"
>>> Elephant Butte, New Mexico
>>> 
>>> 
>>> 
>>> On May 16, 2013, at 3:36 AM, Brian Borchers wrote:
>>> 
>>>> 
>>>> Hello,
>>>> 
>>>> I am considering an Autoprop for our 320. I reviewed some photos  of
>> "Nauti - Duck" on the C320 web site and it looked like the strut had a cut
>> out, does anyone know if this was done to accommodate the propeller?   Those
>> who have the Autoprop or have had an Autoprop, your feedback and experience
>> regarding the propeller is appreciated.  
>>>> 
>>>> Brian
>>