Browsing the forum gave me some answers but not all, I hope you can give me some helpful comments.
Situation now:
7,5 m Daysailer,
1.6 tons displacement, S-frame,
Maximum hullspeed 6 kts,
inboard electric motor, 2.5 kW max 1080 RPM, efficiency +/- 85%,
3 blade 12" prop, efficiency +/-...