Thanks Mike,
That looks just the job. Small and relatively inexpensive.
One have decided on the size will make one up.
Rowen
Have a look at this, should be easy enough to make even without a 3D printer
https://www.youtube.com/results?search_query=model+boat+minature+bow+thruster
Assistenza Model Boats Website con un abbonamento e sblocca nessuna pubblicità, download di immagini, puzzle passati e altro — a partire da poche sterline al mese.