[C320-list] Autoprop Feedback

[Bruce Heyman]

Put in book.

Bruce Heyman
(949) 289-8400

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
>> 
>