[C320-list] silly question

[Kirk McCullough]

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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