[Alberg30] Prop selection

Tom Sutherland sutherlandt at prodigy.net
Tue Nov 25 08:30:37 PST 2003


Mike, You make some real good points. Thanks!

tom s

Mike Lehman wrote:
> 
> I would not run my boat on the reverse gear for any extended period of time.
> The gearing is different that the forward gear and reverse was designed to
> be used only for short periods. Maybe someone, who knows more about
> transmission, can comment on this.
> 
> Second, a new prop isn't that expensive, and if properly sized you won't
> have to try different ones, because you will have the right one. You are not
> 'stuck' with a prop forever... it can be re-pitched. There are limits which,
> if memory serves me, is 1" in either direction. Meaning you can go from a
> 12x6 to a 12x7 or the other way to a 12x5. Some things you can't change are
> diameter or direction L/R. That's when you buy a new prop.
> 
> Mike Lehman
> "Gilleleje" #505
> 
> ----Original Message Follows----
> From: Tom Sutherland <sutherlandt at prodigy.net>
> Reply-To: sutherlandt at prodigy.net,   Alberg 30 public
> list<public-list at alberg30.org>
> To: Alberg 30 public list <public-list at alberg30.org>
> Subject: Re: [Alberg30] Prop selection
> Date: Wed, 19 Nov 2003 13:31:05 -0500
> 
> Thanks Mike!
> 
> Are you pleased with the performance of this prop?
> 
> I have recently installed a new three cylinder kubota diesel. The engine
> is supposed to produce 25hp at 3000 rps. It has a Hurth transmission
> with a reduction of 1.79 in forward and  1.85 in reverse. I am still
> turning my old prop which is a 12X6 2 blade. It is a right handed prop
> however and the new set-up calls for a left handed prop. I thought I
> could get by with just reversing the transmission linkage (forward is
> reverse and reverse is forward) until I had a chance to see how the 12x6
> prop would perform and maybe help me determine what I should order.
> 
> I have been given mixed reports as to what effect this might have on my
> transmission so I am a bit uneasy as to how long I should run this way.
> It actually seems to perform pretty well.
> 
> I am however leaning toward a three bladed prop.
> 
> As I understand things you are pretty much stuck with any new prop once
> you buy the thing. Not like you can send it back and try something else.
> So I am a bit anxious about what prop I should order.... Maybe I should
> contact "Michigan Wheel" and see if they can make a recommendation.
> 
> Any comments or suggestions would be appreciated.
> 
> (I invite one and all to comment)
> 
> Tom S
> A-30  #412
> 
> Mike Lehman wrote:
>  >
>  > If I remember correctly, the prop is a 12x10 3 blade. I had it sized for
> the
>  > design and weight of the boat taking into cosideration the power curve of
>  > the engine and cruising rpms. Michigan Wheel, Inc. did the calculations
> and
>  > I bought the prop at Miller's Island in Baltimore.
>  >
>  > Mike Lehman
>  > "Gilleleje" #505
>  >
>  > ----Original Message Follows----
>  > From: Tom Sutherland <sutherlandt at prodigy.net>
>  > Reply-To: sutherlandt at prodigy.net,   Alberg 30 public
>  > list<public-list at alberg30.org>
>  > To: Alberg 30 public list <public-list at alberg30.org>
>  > Subject: Re: [Alberg30] Re: Public-list Digest, Vol 169, Issue 7
>  > Date: Tue, 18 Nov 2003 20:33:47 -0500
>  >
>  > Mike,
>  >
>  > What prop do you turn with this engine? I am sure you have said but I do
>  > not recall.
>  >
>  > Tom S
>  >
>  > Mike Lehman wrote:
>  >  >
>  >  > I have a 4cly 30HP Universal that I installed myself in #505. It's
> more
>  >  > power than you need.
>  >  >
>  >  > Mike Lehman
>  >  > "Gilleleje" #505
>  >
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