those itty bitty gens werent 7 k were they?
Nemo dat quod non habet
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Friday, February 24, 2012 2:43 PM
Subject: [Electric Boats] Re: variable speed props....
To: electricboats@yahoogroups.com
Sent: Friday, February 24, 2012 2:43 PM
Subject: [Electric Boats] Re: variable speed props....
Here's an excerpt of one of my posts from last year:
"Variable pitch will make a more effective hydro-generator as proven by "the amazingly expensive french hydrogenerators (more than $7000 US each) that have been discussed on this board more than once this year."
http://www.velux5oceans.com/#/ocean-sprint-4-news/brad-hydro-power-sustainability/1902
The variable pitch props are computer controlled to maximize the charge while minimizing drag. I get the impression that they have an algorithym that optimizes the tradeoff for different speeds. They have the advantage of sailig at much higher speeds than most of our boats and they are only looking to supply house loads."
On the drive side of the conversation, since electric motors have such a wide power band, there is less of a reason to vary the output of a prop (speed) while running the engine at peak power like with ICE boats and planes. I haven't heard about anyone that has achieved dramatically better results from an electric drive with a variable pitch prop, but that doesn't mean that it can't be done. But the end result is that any increases in performance may not offset the increased cost and complexity.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Michael Mccomb <mccomb.michael@...> wrote:
>
> does anyone here have any experience with or thoughts about using an adjustable prop with an electric motor/regen system..... seems like a processor controlled prop could be made to self adjust so as to provide very high efficiency
>
"Variable pitch will make a more effective hydro-generator as proven by "the amazingly expensive french hydrogenerators (more than $7000 US each) that have been discussed on this board more than once this year."
http://www.velux5oceans.com/#/ocean-sprint-4-news/brad-hydro-power-sustainability/1902
The variable pitch props are computer controlled to maximize the charge while minimizing drag. I get the impression that they have an algorithym that optimizes the tradeoff for different speeds. They have the advantage of sailig at much higher speeds than most of our boats and they are only looking to supply house loads."
On the drive side of the conversation, since electric motors have such a wide power band, there is less of a reason to vary the output of a prop (speed) while running the engine at peak power like with ICE boats and planes. I haven't heard about anyone that has achieved dramatically better results from an electric drive with a variable pitch prop, but that doesn't mean that it can't be done. But the end result is that any increases in performance may not offset the increased cost and complexity.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Michael Mccomb <mccomb.michael@...> wrote:
>
> does anyone here have any experience with or thoughts about using an adjustable prop with an electric motor/regen system..... seems like a processor controlled prop could be made to self adjust so as to provide very high efficiency
>
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