We use a tow along generator with good results. The generator itself is
lashed to the pushpit and the prop is trailed behind the yacht on a
length of double braid (About 1.2 to 2 X boat length). Gives about
..75A/Kn above 3Kn. On a cruise it is enough to drive the trilight and
the fridge if you are using a wind vane steering system. Otherwise
enough for the autopilot.
We do not use it on coastal runs for the fear of spagging the prop.
Open water sailing it is ideal.
Tony
S/V Ambrosia