[Public-list] Props for diesels

[Mike Lehman]

The Atomic for is 1:1 so 1500 engine RPM is 1500 prop RPM. Most small 
diesels have a reduction gear something like 2:1 so the engine will run at 
2800 RPM for the same prop rotation. You need to check the specs on your 
engine. The prop should be sized and pitched for the performance curve of 
your particular engine. The Atomic for prop will not be the ideal prop for 
your diesel, but will drive the boat. Michigan Wheel has an excellent 
service and website for matching the boat/engine/prop. This is not guess 
work, it is very precise.

Mike Lehman
><((((º>¸.·´¯`·...¸><((((º>


----- Original Message ----- 
From: "faerthen felix" <ffelix at lycos.com>
To: <public-list at alberg30.org>
Sent: Tuesday, September 07, 2004 5:17 PM
Subject: [Public-list] Props for diesels


> Hi all,
>
> I'm unclear on the potential gearing differences between the Atomic 4's & 
> the small Yanmar diesels that are often used to replace them. Does the 
> same prop advice apply to both? Can (or should) I use the Indigo 3-blade 
> prop with my 2GM20? I, too am somewhat unimpressed by our current 2 blade 
> prop :(
>
> Thanks for such a great, informative forum!
>
> FF
> Nisus
> #267
>
> ----- Original Message -----
>
> > Date: Sat, 4 Sep 2004 06:55:44 -0400
> > From: " John Brugeman" <johnbrugeman at ameritech.net>
> > Subject: Re: [Public-list] Re: 2 or 3 bladed prop
> >
> > Michael,
> >
> > I put a 3 bladed prop on my 68 Alberg 2 years ago; the one made by 
> > Indigo
> > Electronics Inc. out of VA,  and it made a world of difference for 
> > several
> > reasons.  Backing out of a berth has been made much easier.  I still 
> > have
> > some prop walk but not near as much as with the old two blade prop. 
> > Pulling
> > into a berth has been much easier since she will stop much quicker.  I
> > haven't banged the bow against the dock yet.  Also when motoring I can 
> > move
> > at around 5 or 51/2 kts sometimes 6 at about 1900-20000 rpms.  You can 
> > also
> > motor at greater rpms with less torch on the shaft and prop. It's much
> > easier on the old engine.
> >
> > John Brugeman
> > Mermaid #305
> -- 
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