Hi Eric,
I wound up conflating my response to this post in my reply to Mike, but, the bottom line on the prop is that "analysis continues" - or at least it will continue after I'm able to get into/out of my slip at all.
A geared system is obviously the most efficient (and expensive, I'm guessing, but, maybe not by much, except perhaps lifecycle costs over decades/centuries - e.g., belt life vs. your 100,000 hour warranty) and should have no problem running in regen mode. There are asymmetrical-toothed gear systems that are only supposed to be run under load in one direction, but, those are exotic even for well-heeled boaters (yachters, really), and would have no use in our application (let alone budget).
All the Best as I descend back under the rock,
Jim
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hi Jim,
>
> My sampling includes boats with 3 and 4 blade props that have swept areas exceeding 85-90%. My boat with a 4 blade 13x15.5 prop is one of those boats.
>
> The commercial hydro-generator for boats people have been working on this for ages and still seem to be limited to less than 100W at 5-6kts. But maybe you'll figure out something that they haven't been able to. There is a $10k dedicated hydrogenerator on the market that uses a hydraulic variable pitch prop to optimize power to drag ratios while generating power. The system does the adjustments on its own, but the price has limited the user base to global racers for now.
>
> On the reduction conversation, if you think about it, the prop isn't ever going to push more power into the system than the motor does, so I don't see where the issue come up. But if the vendor is concerned, I would heed their advice. I know that it is not an issue for the Propulsion Marine systems.
>
> Fair winds,
> Eric
> Marina del Rey
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