[Public-list] Propeller question

[John Boor]

I too have a 2 blade prop that max's out at 1400 RPM and
find this is to low speed to recharge my battery bank
quickly.  I am haveing my prop re worked to reduce the dia
to about 11 ins and decreasing the pitch a little.  This
will have the effect of increasing the RPM's to about 1800
at 6 knots thus allowing my 90 amp alternator to deliver
full amps, also it will let the A4 work in a better power
range.  I thought about the Michigan 2 and 3 blade prop's
but neither would increase the RPM's I need.  I hope this
will improve my performance but only this summer will let me
know.

John Boor
MAHSEER #380

 I am  interested in upgrading my propeller. The boat came
> with a 2 blade
> 13-6  sailor prop. I have an A-4 with a 1:1 gerar ratio.
> The engine seems to max out at about 12-1400 rpms at about
> 6 kts, if memory serves
> me correctly. I want to go to a 3 blade sailor prop to
> improve the thrust and maneuvering capability, especially
> near the dock.  Michigan Wheel recommends a 12-6 three
> blade prop based on the data I provided in
> their prop-it- right web survey.
> 
> 
> My questions are - what sort of rpms do you get if you
> have a three blade sailor prop coupled with an A-4 having
> a 1:1 gear ratio. What size 3 blade prop do you have?
> 
> What are other sources for props - aside from Michigan
> Wheel? 
> 
> Any other reflections or observations would be
> appreciated. 
> 
> Thanks
> 
> David #432
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