[C320-list] silly question

[Chris Burti]

Don't feel bad Rosebud...I don't understand propwalk discussions in the
context of a C-320 as it is so mild as to be nonexistant even with the
3-bladed prop.

On Tue, Mar 4, 2008 at 12:15 AM, <crashley at gte.net> wrote:

> I'm not sure I understand anything about why one would want to put a
> reverse
> pitch prop on. Geeze. What about going forward!!?? Just get a good
> feathering prop with independent fwd/aft adjustable pitch.
>
> CRA
> Rosebud #882
>
> ----- Original Message -----
> From: "Kirk McCullough" <kirk.mccullough at telus.net>
> To: <C320-List at Catalina320.com>
> Sent: Sunday, March 02, 2008 10:49 AM
> Subject: Re: [C320-list] silly question
>
>
> > Right, the gearbox may have different gear ratios in forward and
> reverse.
> > The Hurth gearbox on the Perkins happens to have the same ratio, so
> > theoretically you could do what you are thinking, except for perhaps the
> > reverse gears aren't meant for continuous use.
> >
> > The Kiwi prop will eliminate prop walk.
> >
> > Kirk
> > #124
> >
> > -----Original Message-----
> > From: c320-list-bounces at lists.catalina320.com
> > [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Dennis
> > Harris
> > Sent: 02 March 2008 06:35
> > To: C320-List at Catalina320.com
> > Subject: Re: [C320-list] silly question
> >
> > On some engines, there is a difference in the rpm between forward and
> > reverse.  On my Yanmar, with the KM2P transmission, the rated speed
> > forward is 1540 rpm and in reverse is 1113 rpm.  So if one were to
> > switch pitch of the prop, and ignoring other considerations that
> > probably say this might not be the best thing, your boat would have a
> > slower top speed forward and an increased top speed in reverse.  This is
> > probably not what you want.  Going to one of the better
> > folding/feathering props.. Autostream, Max prop, Kiwi, etc....might be
> > best way to reduce/eliminate prop walk (based on some posts I have
> > seen....I have 3 blade fixed prop with the walk).
> >
> > Dennis Harris   C320 #694
> >
> > bruceheyman at cox.net wrote:
> >
> >>Yes but you need to make sure that the transmission is rated for
> >>continuous
> > duty in reverse.  Often transmissions are designed with much thinner
> gears
> > in reverse since they get so much less relative use.
> >>Bruce
> >>Somerset 671 SoCal
> >>Sent via BlackBerry by AT&T
> >>
> >>-----Original Message-----
> >>From: jim brown <jbrown5093 at yahoo.com>
> >>
> >>Date: Sun, 2 Mar 2008 04:24:40
> >>To:C320-List at Catalina320.com
> >>Subject: [C320-list] silly question
> >>
> >>
> >>This is probably a very dumb question but I was
> >>wondering if the prop was replaced with one with
> >>exactly the opposite blade pitch and angle could the
> >>boat be driven by just using reverse to go forward and
> >>forward to back down. In theory I'm trying to change
> >>my prop walk to one to starboard. Jim Brown    "Desafinado"
> >>
> >>
> >>
> >
> ____________________________________________________________________________
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> >>
> >>
> >>
> >
> >
> >
>
>


-- 
Chris Burti
Farmville, NC