John,
You may wish to look at the results from the past Wye Island Electric Boat Challenge races: http://www.electricboats.org. Paul Kidd ran a Stillwater rowing coaching boat which had twin 25' hulls, very narrow, with electric power. He only achieved hull speed, about 8 mph for the 24 mile race. Some of us have achieved 10 + mph, all with Torqeedo 4 outboards. This includes lead acid on a 20' canoe and 16' and 20' planing monohulls with Lithium battery packs. 10 + mph was also achieved on one occasion with a 58' rowing scull using lead acid batteries. Some of us have achieved over 17 mph for short distances using twin Torqeedo 4's and lithium packs. BTW, used Tesla packs are available as are Nissan Leafs.
Good luck
Ned
On May 13, 2015, at 11:03 PM, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:So I was starting to daydream about what the ultimate daytime cruiser would be like....A classic wooden launch would be really cool, with a nice bimini for sun protection.The Duffy is really cool. And something like that could have some wood worked into it...The thing is, though, that the one thing that seemed limiting about the sailboats I loved was how slow they were. We all know how much more exponential power it takes to push a sailboat type hull (basically including a launch or a Duffy) past hull speed.What's the top speed of a Duffy??? Maybe 5-6mph max cruising speed?I'd really love something that could cruise at 8-10mph. But to get a classic monohull to do that, I'd have to spend a BOATLOAD of money on a battery approaching something that could be used in a Tesla.What about a pontoon boat?It's not as classic, but it would at least let me go fast enough to get a reasonable distance from the marina. And a catamaran form would be MUCH more efficient than a monohull, with plenty of space for passengers in a small, light form factor...If I built something like a 6' by 12 or 13' pontoon boat, any idea how many HP it would take to get it cruising at 10mph?Thoughts?John
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Posted by: Ned Farinholt <nedfarinholt@comcast.net>
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