Hi Ryan-
As others have indicated, it's 'doable', but the devil's in the details. Any idea what HP would be required to do 30knots? Even if you could get it down to 80-100HP, that's quite a generator you'll need. Someone indicated you're here in the Portland area? My outboard 26' has been electric now for 11 years and for much of that time I've run as a 'hybrid' for distance travel. But at 1.4kw to the batteries from the genset while cruising it's nothing close to what you're talking about---you'd need some 60kw!
Someone recommended speaking with John "Plazmaboy" Wayland about doing a series-config of Warps. Yes, his Datsun used to be configured this way and while it was successful, eventually for drag racing they came up with a unitized dual-motor setup that eliminated weight and minimized vibration issues with that. But this is where the comparisons end. In your case, you're looking at perhaps 20-40HP per motor (x4) to do your 30kts. In drag racing, Wayland's Datsun delivers over 400HP or about 200HP per half-motor---albeit for only 11seconds.
Anyway, if you're in the Portland area, contact me off-list if you'd like to talk, contact John or get a look at my electric: www.evalbum.com/492
Matwete at Comcast dot net
-Myles
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Sunday, June 08, 2014 10:51 PM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Electric Express cruiser 31 foot
Hello everyone, I am a new member, Marine mechanic of 15 years, and am new to the electric world. I have always been very interested in converting my 31 foot silverton boat that had twin 350 gas engines and alpha drives. I bought the boat with one engine bad, and have since gutted it all apart, and deciding what way to go. I have been reading a lot of your post, even though they don't pertain to me, Im just getting familiar with everything as much as I can. What I wanted to know, is could a guy use a 2 coupled together DC "Warp 9" electric motors, so 4 total, and opposed to having a huge battery bank, could I use a generator that would be running when cruising, and maybe not be able to cover all of the load, but at least extend my cruising range. I live in Washington, and we cruise the puget sound primarily, and have power at the dock at the marina, and can keep everything charged up, and also worth noting, we never cruise more than about an hour or two at a time, then find us hanging out tied up the majority of the time. Also have plenty of room for a couple solar panels also, but with owning a planing hull, would like to be able to reach speeds of say 30 knots, boat without the gas engines is about 7000 lbs. Thanks for any responses, Ryan.
Posted by: "Myles Twete" <matwete@comcast.net>
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