Sunday, February 24, 2019

Re: [Electric Boats] Sailboat Props - Data Please

 

Our boat is similar. We have an Alberg 30 running a 5kw. Electric Yacht system.  3:1 gearing and 200 amp hour pack AGM.  We have a 13×12 3 blade. We are liveaboard so boat is heavy. With this setup we run just over 3 knots at 20 amp draw. 
It's been 8 years with the conversation but I remember not goings with the propcalculators as they are set for IC engines. The wisdom at the time was to use the biggest prop that would fit in the appature and use 3 blade instead of 2.
Richard

On Feb 23, 2019 6:25 PM, "tvinypsi@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
 

I'm studying a possible conversion to electric of my 35-year old full-keel sailboat.  But the variable on which I'm having the most trouble finding experience-generated data is prop selection.


I'm aware of prop calculators out there, such as VicProp, but can anyone in this group report on the success of lack thereof, in the actual experience of using a calculator to make a selection?

Did you use VicProp or some other calculator to choose your electric-boat prop, and how did it work out?


If you are using an existing or stock propeller with your electric boat system, what are its specifications (# of blades, diameter, pitch, & mfg.); what power output is your motor (Kw); Max RPM/Reduction ratio (propeller RPMs in other words); and performance?


I'm aware of the data sheet available on this group, but the prop information is spotty.  However, mainly, I'd be interested in hearing of anyone's experience with a prop calculator, and which one.


Any help out there?


[-tv]

Tom VanderMeulen

"Grace O'Malley"

Cape Dory 27



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Posted by: Richard <fullkeel2000@yahoo.ca>
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