T-Pain Is On A Boat: Re: [Electric Boats] Props

Wednesday, September 1, 2010

Re: [Electric Boats] Props

Hull depth is not counting the keel. If you have questions you have to ask the guy that wrote the program. It worked for me it was fairly accurate. I think it came from one of the electric motor conversion sites. I can go back and see if I can find it or the guys email.

Dan

--- On Wed, 9/1/10, redu <reino.urala@gmail.com> wrote:

From: redu <reino.urala@gmail.com>
Subject: Re: [Electric Boats] Props
To: electricboats@yahoogroups.com
Date: Wednesday, September 1, 2010, 9:39 AM

What a ...
Instant check of Daniel Michaels .XLS:
1. Prop diameter:
sqrt(MaxBeam * MaxHullDepth) * 4.07
Recommended prop dia becomes 30" for example 27 feet hull? Prop dia from hull beam and depth?
2. Prop slip:
In sheet example slip is 55%. What? Should better be 5.5% or something?

Maybe something was misunderstood?
redu

On 09/01/2010 08:26 AM, Daniel Michaels wrote:

Richard I think it is going to depend on what you expect while motoring. Here is a spreadsheet you can use to figure out what you may get. If you email the guy that did the spreadsheet he will send you an updated one that you cannot distribute. He only wants the real numbers you get once you get set up. The other thing you can do is just run the prop while sailing at a very low rate just enough to negate the drag. It does not use that much juice.

Dan

--- On Tue, 8/31/10, fullkeel2000 <fullkeel2000@yahoo.ca> wrote:

From: fullkeel2000 <fullkeel2000@yahoo.ca>
Subject: [Electric Boats] Props
To: electricboats@yahoogroups.com
Date: Tuesday, August 31, 2010, 7:13 PM

Greetings all
our boat that we are converting to electric power is an Alberg 30. 9000 displacement (until we add our cruising 21'8" water line (when not healed)
Question is regarding the prop.Since we want to stay with a 2 blade (want to keep the amazing light air performance with the prop hidden behind the full-keel) and can go no bigger than a 13" it was recommended that we go to a 13x12 to replace the current 13x7
i would love to know what anyone with a simiular sized boat is using

Thanks Richard