[C320-list] Club Racing the C320

[Kirk McCullough]

Right so it is unique too, but not with the same design as the Kiwi. I 
believe, correct me if I,m wrong, that the Autoprop feathers in line with 
the shaft. If the shaft is 20 degrees to the hull, the blades are not 
exactly aligned to the water flow.

That may be the difference??

Kirk
#124
----- Original Message ----- 
From: "Richard A. Walker" <dickwalker at att.net>
To: "'C320-List'" <c320-list at catalina320.com>
Sent: Sunday, August 26, 2007 5:18 PM
Subject: Re: [C320-list] Club Racing the C320


Kirk, the Autoprop have all 3 blades feather independently.  It also senses
the power(Thrust) and adjusts the pitch.

Cheers,

Dick Walker
C-320 (687) WindWalker II
740 Olive Ave.
Coronado, CA 92118-2136
619.435.8986



-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Kirk McCullough
Sent: Sunday, August 26, 2007 4:39 PM
To: C320-List
Subject: Re: [C320-list] Club Racing the C320

Good input Scott.

On feathering props, the Kiwi is unique in the way it feathers. It is 3
balded and feathers each blade independantly. Each blade aligns with the
flow independ of shaft angle, where the shaft stops rotating (ie no need to
lock the shaft to be sure blades are folded properly) independant also of
underbody shape, heel etc etc. Other feathering props are made so all blades

are feathered at the same angle and don't consider shaft angle etc.

Kirk
Boomerang #124

----- Original Message ----- 
From: "Scott Thompson" <sthompson at toad.net>
To: "C320-List" <c320-list at catalina320.com>
Sent: Sunday, August 26, 2007 4:02 PM
Subject: Re: [C320-list] Club Racing the C320


> Because the rules are made by serious racers, and no serious racer wants a

> rule change that would generally make it better to have a slower sailing
> boat.  Few racers, even on San Francisco Bay, share Adam's rapture about
> the the benefits of using a fixed prop as a brake!  The rules are thus
> biased in favor of racing gear over cruising gear, and no one believes
> that they equalize all boats.  If that's what you are after switch to a
> strict one design class and get out of PHRF.
>
> For what it's worth, I believe that folding props are faster than
> feathering ones, and if you really want to race successfully you will do
> better with a small two-bladed folder that folds into a really compact and

> streamlined package (e.g. the nicer Martec) than with any other prop.  On
> the other hand, if you are really that serious about racing then the 320
> isn't a very good choice of boat in the first place.  I love to cruise my
> 320 and I love to race.  But I race boats that are designed for speed, not

> cruising comfort.
>
> Scott
>
> chris denny wrote:
>> If it is generally accepted that a folder is that much of a benefit, why
>> is the allowance for a fixed prop not greater? I thought the idea was to
>> make things "equal".  Is 6 seconds the "standard addition" for a fixed
>> prop?
>> cd #328
>> Peter Clancy wrote:
>>
>>> Casual racers may underestimate the value of relatively small speed
>>> improvements.
>>>
>>> For example, assume a course is 15 nautical miles long. If you have a
>>> modest 1/2 knot per mile speed advantage (with a folding prop) over an
>>> identical boat with a fixed prop and you average 6.5 knots, by the time
>>> you reach the finish  you'll be at least 10 minutes ahead of the slower
>>> boat. If that boat has a 6 second per mile rating advantage due to a
>>> fixed prop, he only gains 90 seconds or 1.5 minutes when corrected.
>>> Generally speaking, the lighter the air, the greater the benefit of a
>>> folding prop. We raced 'AROBAN' successfully for several years with a
>>> Gori two-blade folder and took first in class in last October's Columbus

>>> Day Regatta which is South Florida's largest annual sailboat race.
>>> The C320 is a capable racer especially when tweaked and sailed for
>>> optimum speed.
>>>
>>> Peter Clancy
>>> 'AROBAN' #222 (former owner)
>>> Miami, FL
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>  ----- Origi nal Message -----  From: Joe
>>> Barrett<mailto:joe at dolphinmortgage.com>  To:
>>> 'C320-List'<mailto:c320-list at catalina320.com>  Sent: Tuesday, August 21,

>>> 2007 9:19 AM
>>>  Subject: Re: [C320-list] Club Racing the C320
>>>
>>>
>>>  If going from a fixed to a feathering/folding prop gains you 1/2-3/4
>>> knot of
>>>  speed do the math. The 6 seconds you loose makes getting a
>>>  feathering/folding prop a no brainer.
>>>  Joe Barrett
>>>
>>>  -----Original Message-----
>>>  From:
>>>
c320-list-bounces at catalina320.com<mailto:c320-list-bounces at catalina320.com>
>>>  [mailto:c320-list-bounces at catalina320.com] On Behalf Of chris denny
>>>  Sent: Tuesday, August 21, 2007 10:05 AM
>>>  To: C320-List
>>>  Subject: Re: [C320-list] Club Racing the C320
>>>
>>>     If a folder is that much help, why does having a fixed prop get you
>>> just 6
>>>  seconds on your adjusted PHRF?
>>>  CD #328
>>>
>>>
>>
>>
>>
>
>
>
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>





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