[Alberg30] Prop selection

[Mike Lehman]

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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