Thaks sirdanell - interesting data!
Two essential questions remain:
Total weight of Sneakeasy + drive system + crew?
Maximum beam(wl) and lenght(wl) of Sneakeasy?
Notes:
Propeller diameter is too small for optimal efficiency, eg. 15"
preferred. Accordingly propeller blade chord should be smaller.
redu
On 08/03/2010 05:08 AM, sirdarnell wrote:
> Here is a guy's electric outboard project using an etek motor and eventually a Sneakeasy. He achieved a max speed over 10 miles per hour.
>
> http://www.psnw.com/~jmrudholm/etekoutboard.html
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> http://www.psnw.com/~jmrudholm/etekoutboard2.html
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> http://www.psnw.com/~jmrudholm/etekoutboard3.html
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> http://www.psnw.com/~jmrudholm/etekoutboard4.html
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> http://www.psnw.com/~jmrudholm/etekoutboard5.html
>
> --- In electricboats@yahoogroups.com, "nedfarinholt"<nedfarinholt@...> wrote:
>
>> I am interested in building an electric runabout and would like help on hull design. Here are the basic requirements:
>> Less than 30 feet in length, preferably 25'
>> Strip hull construction
>> Sufficient beam to accommodate two persons side by side, at least 3', prefer 4'
>> Sufficient stability to handle a broach in 3' chop or powerboat wake.
>> Prefer monohull.
>> Cruising speed above 10 knots.
>> Cruising duration 3 hours at 10 knots.
>> Would like to accomplish the above with less than 600 lbs LA batteries.
>>
>> I understand the tradeoffs among battery chemistries, motor, and controller types.
>> What I want help with is hull design. The trade offs between length to beam ratio, drafts, and hull geometry. I have purchased plans for 20 to 30 foot canoes and Atkin's Sergeant Faunce utility. By increasing the freeboard and decking the canoes, I think I can handle the open water, but my real issue is how much must I increase the L/B ratio to overcome the 1.3xsq rt of waterline? I would rather not go as far as the guy in the Wye Island marathon who used a 50' rowing scull!
>>
>> Any ideas or experience or can you refer me to some sites or literature. I have already scoured the web pretty thoroughly.
>>
>>
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> Yahoo! Groups Links
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