Bushnell Turtle in 1:12 scale
Turtle (also called American Turtle) was the world's first submersible vessel with a documented record of use in combat. It was built in 1775 by American David Bushnell as a means of attaching explosive charges to ships in a harbor, for use against Royal Navy vessels occupying North American harbors during the American Revolutionary War. Connecticut Governor Jonathan Trumbull recommended the invention to George Washington, who provided funds and support for the development and testing of the machine.
Designed in conjunction with Randy Sanders, these files allow the construction of a 1:12 scale replica of the Turtle, measuring 200mm long, 215mm tall and 91mm wide in original scaling. Obviously, you can scale to whatever size you would like if you elect to print it yourself.
Each part is rendered as a solid, so if you want it hollow, simply print at a 0% infill with a 4 to 5 layer shell.
In this scale, it makes for a beautiful display model, but scaling it up will allow for more features, such as lighting, working propellers, or for the brave, full conversion to RC operation!