Good to have you join the group, Gary.
You are right in thinking a small electric system will give you about as good performance (except range) as the diesel. You will love the silent running where you can hear your own bow wave splash over the stem.
Based on a 1000# boat (including batts) plus 400# of crew:
500 watts, (0.6 hp) will push your boat 4 mph. That's 20 amps at 24 volts - about the power of an electric scooter or bicycle system. (2) 105 ah 12v batteries would give a little more than 3 hrs at 20 amps; (4) 220ah 6v batts would give nearly 8 hours. Slowing down a little bit to 3.3 mph (10a) more than doubles the range.
Your hull speed is 5.7 mph - its highest practical speed which would take 60 amps. (2 hp) A small diesel (5 - 10 hp) would not go much faster than this.
As someone else replied - you want the largest prop that fits. You could have your shaft machined to fit a Torqeedo 12 x 10 prop ($80). You would want to aim for about 800 shaft rpm with this prop.
Running on a 110v gas generator without batteries is a bad idea, IMHO. Speed control is very expensive and what's the point? You have the noise and exhaust of a gas engine all the time. A 2.5 Honda or 3 hp Suzuki OB in a well would be a much better solution.
If you really need more range than batteries alone can provide plug your battery charger into the 1000w generator. Note, though, that (4) 6v batteries will last all day - and that is a long time to be out in a 16' open boat.
Good luck.
Denny Wolfe
www.wolfEboats.
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