These files will enable you to build a radio controlled tug boat at 1/48th scale though the files could be printed larger or smaller depending on personal preference.

The motor tug Flying Scotsman is a generic motor tug that was common around European harbours in the 1980's. The tug is loosely modelled on the Flying Phantom fire-fighting tug but without the high platforms that give it an unusual appearance. See my model here https://www.cgtrader.com/3d-print-models/hobby-diy/robotics/rc-tug-flying-phantom-3d-print .

As a radio controlled model it has a superb performance using a Kort Nozzle rudder around the propellor - files and full instructions for which are included in this kit. She is a very stable, manoevrable model in forwards and reverse, making her great fun to operate.

A full instructuion manual is included, a freed copy of which is available here..... https://www.cgtrader.com/free-3d-print-models/hobby-diy/robotics/radio-controlled-flying-scotsman-motor-tug-instructions so that you can see what is involved in building the model before purchasing the files.