Re: [electricboats] Naive newbie questions

If you'd like a little more or a little less power, push that number up or down a bit.  You now have an estimate for the power of the electric motor you'll need.  Others have commented on how some options might not be powerful enough; now that's quantified.  Next, consider the shaft rpm of your YSM8 when it's running at full tilt.  Find a motor that can deliver that speed while under full load, scheme up a gear system to speed it up or slow it down, or anticipate exchanging the propeller with one that's suitable for the new shaft speed.
As for your electricity source, I suggest you consider LiFePO4 batteries.  Bioenno Power is one vendor; they offer a lot of information that explains  LiFePO4's advantages relative to deep-cycle lead acid.  However, there are other vendors of LiFePO4 batteries that charge much less (i.e. a half or a third!) for the batteries themselves, though they might not have the customer service attitude or reputation of BP.  Compute your cost for both options, considering all factors, including what fraction of the battery's stated capacity is actually usable.  Figure out how long you want your motor to operate in normal use, and plan the battery purchase accordingly.  For emergency use, I suggest you keep a small outboard motor with fuel on hand.  That will be less expensive than sizing your battery bank for the worst emergency situation that you wish to be ready for.
Let us know what you learn and how it goes!
Halden

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