RPM advice

[Neil]

Thanks mate, I’m totally confused now so somewhere between 150 to 300 RPM would be OK depending on the model size etc.
Could you ask the question “ has anyone built a 50:1 scale model of the Navy tug Fearless if so could they help me by advising The RPM for fixed scale twin paddles on this particular model ” is that possible please.

Posted for a friend😁