[C320-list] silly question

[crashley at gte.net]

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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