3D Printed 'Toypedo'

This summer's latest contribute to Thingiverse is a miniature torpedo engineered by contributor Patrick Bledsoe. This small aquarian missile may not be the quickest thing making the rounds at the pool, but it is easily assembled, almost entirely 3D printed, and a great way to get the kids involved in the creation of a toy rather than just using the first prepackaged thing that comes along. Using files from Thingiverse and Grabcad, Bledsoe put together a sleek design that can travel 12-18 feet underwater without sinking or popping to the surface. So, if you are looking for a reason to get a healthy tan but are having a hard time walking away from 3D printing projects, this might be just the project you need! Check it out here: http://3dprint.com/86422/3d-printed-tiny-toypedo/
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If you made the fins on the other end another propeller (with the opposite pitch), you would get a lot more drive. Many WW2 torpedoes had twin counter-rotating props, but they were usually both at the tail end.Also for maximum distance get rid of the flanges on the pink parts and the black cagelike structure. Those are just creating drag.