The spreadsheet and the guide to using the spreadsheet were posted here on this list by the author. Both documents are in the "Boat Performance" folder in the Files section of this group.
http://groups.yahoo.com/group/electricboats/files/Boat%20Performance/
The author's contact informationis included in the guide document.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Daniel Michaels <nov32394@...> wrote:
>
> 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@...> wrote:
>
> From: redu <reino.urala@...>
> 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
>
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