The tall ship Preussen is a medium-sized cargo vessel, slightly smaller than (and significantly better-looking than) a liberty ship. Its hull is 36.25in (excluding bowsprit) with a beam of 4.25in. This model is built to be compatible for both Big Gun and Fast Gun construction rules and includes an extensive and highly effective water channel.
The production version of the 3d-printable Preussen incorporates many features not included on the prototype hull. The propulsion train is significantly improved. Specifically, the propeller cutout has been significantly enlarged, allowing a wider variety of props to be used. The motor mount is properly aligned with the prop shaft. The motor mount is designed for a standard 365 or 380 can motor. The rudder post has been significantly strengthened, and the rudder is Fast-Gun legal. Unfortunately I could not fit a standard-sized servo for the rudder. Short of rebuilding the quarterdeck to be much longer, there simply is not enough space. Fortunately waterproof sub-micro servos are available, and I have used them for several years with great success.
Damage control has also been improved based on experience with the prototype hull. A built-in blast shield now protects the bow area from exit wounds. An extensive water channel has also been incorporated, sized for a micro BC pump, vac-u-gearing pump, or 3d-printed pump. The water channel includes cutouts for ballast in appropriate places, to maximize stability. Fill the included pockets with lead shot, lead roofing sheets, or similarly dense materials and the ship should remain upright through even the mightiest gales.
Note: the ballast as designed is not sufficient for sail propulsion. If you intend to use sail propulsion, a drop keel will be required to hold the lead several inches below the hull. This particular model does NOT incorporate any preparations for sail propulsion, although you can modify the included Fusion360 or STEP files as desired.
The decks have also been improved based on lessons learned from the prototype. While individual deck pieces are printed separately, they are designed to be acetone-welded together into larger pieces. Many of the mast supports are also removable, to improve access for maintenance. Holes have been included for #4-40 heat-set inserts, so you don't have to worry about threads wearing out over time. And perhaps most importantly, the main Liverpool House deck has been designed for 6mm neodymium magnets, allowing easy access to the battery and electronics.
At this point in time, the hull is fully printed and assembled, but the decks and hardware still need work. I will update as production continues.
I designed it for the following hardware:
5200mAh 2S or 3S hard-shell battery:
sub-micro waterproof servo:
Any 365 or 380-sized motor, similar to these:
5mm carbon fiber tube masts: