Yes, you should be able to make or exceed that speed without drawing from the batteries. The honda 2kw portables are fairly popular generators among sailboaters with electric drive. Google for the Bianka blog for a fine example of a sailboat equipped with electric motor, honda generator, and solar panels.
Using a gasoline engine to turn a generator to produce electricity to feed into batteries to power an electric motor to turn a prop is obviously not very efficient. But this is an excellent backup system if you don't mind gasoline onboard, and take appropriate precautions. Ideally for a small sailboat you charge your bank from shore power, and use it only for docking and similar maneuvering, maybe for power tacking, on some boats that don't tack well. Then you use the Honda just to get home when you have to motor, and the batteries are already discharged to the limit.
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