Great datapoints at that link.
They mention regarding the “Duogen” generator unit:
Speed Power Out Drag RPM
5kt 72watt 20# unk
6kt 92watt 25# unk
7kt 144watt unk unk
8kt 196watt unk est. 750RPM based on alternator rating below
Standard Prop: cast aluminum, 3-blade, nom. 12” diam
Alternator (onboard, shaft-driven from prop): 250w@800RPM rated
Then they refer to a competitor’s unit that at 6kt, produces but 60watt at 35# drag.
Clearly generator performance, even in highly engineered cases as these can vary.
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Todd
Sent: Saturday, December 04, 2010 5:49 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Interesting regen info
I found a very interesting FAQ http://www.duogen.co.uk/faq.htm. It contains drag figures and amperage for a couple of water generators. It would be interesting to use this site's power spreadsheet to crosscheck the speed hit. I think what I have gotten out of these discussions is that regen is not really viable for day use but can be very useful for onboard usage while cruising. Hats off to Eric, who is always polite while being very knowledgable and objective.
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