Yes I got the message after the post, timing is everything as usual,
the only folks Ive run into here that are concerned with regen on sailboat have mentioned
48v systems, I imagine someone using different voltages might clarify their position.
Someone might ask, "What voltage are you considering for the 20a regen criteria?
Actually, it appears you need a catamaran and a real good wind, doing about 15knots PLUS
to get anything considerable in a days outing.
From: GNHBus@aol.com
To: electricboats@yahoogroups.com
Sent: Mon, Jun 20, 2011 7:39 am
Subject: Re: [Electric Boats] Re: Incremental Options
that represent the larger majority here in this group and what I see on the water here in New England.
Range and amperage cost relative to a typical sailing day.
What would you say is the minimum required amp hr return during a typical sailing day that justifies Regen Under Sail
as practical? Does 20 amp/hr seem right ?
[MODERATOR NOTE: I am reluctantly approving this post despite informing the poster in an earlier attempt to post this that this regen topic has been gone over numerous times and that it's meaningless to talk about Amps or Amp-Hours in terms of regen unless you specify the voltage. Please folks: Current and capacity are what are referred to when you use the terms amps and amp-hours. Power and energy are the meaningful terms to use if you want meaningful answers from a group that uses voltages that range from 12-150+ volts.]
-----Original Message-----
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Sun, Jun 19, 2011 5:34 pm
Subject: [Electric Boats] Re: Incremental Options
OK, I didn't get any of that out of your first post. We're definately on the same page concerning propulsion and regeneration from the same propeller, impellor, turbine, screw, etc.
Eric
--- In electricboats@yahoogroups.com, GNHBus@... wrote:
>
> I agree, and I never said it was a new idea waiting to be discovered. The flow meter has a system designed to rotate based on water flowing passed it.
> Very similar to what is required when attempting to Regen under sail. Propulsion & Regen are separate issues and trying to attempt to produce practical results
> for both using (1) sailboat prop seems futile.
>
>
> -----Original Message-----
> From: Eric <ewdysar@...>
> To: electricboats@yahoogroups.com
> Sent: Fri, Jun 17, 2011 11:48 am
> Subject: [Electric Boats] Re: Incremental Options
>
>
> While this type of water screw may provide accurate flow measurements, various groups, including goverments, have spent hundreds of years refining propellers to push boats around. The familiar bladed propeller has been proven to be more efficient and effective for propulsion again and again.
>
> If I remember correctly, the "Turtle" submarine built in 1776 had hand-powered water screws for propulsion that were very similar to the photo in the link that you posted. So these aren't really a new idea that is waiting to be discovered.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, GNHBus@ wrote:
> >
> > http://commons.wikimedia.org/wiki/File:Dumas_Neyrpic_Current_Meter.JPG
> >
> > Interesting selection for "screw" on this flow meter
> >
>
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