VERSION 2 IS OUT: https://www.youmagine.com/designs/prototye-3d-printed-jetsprint-jet-boat-v2 Forum thread: https://www.rcgroups.com/forums/showthread.php?3061106 A personal project I've been working on. Posting here since there aren't many 3D printed jetboat designs out there. lijingwei made one too. He's also made some improvements. You can find these here: https://www.thingiverse.com/thing:2890756/remixes https://www.youtube.com/watch?v=_mYeioW3AUQ My boat's maiden outing: https://www.youtube.com/watch?v=N3IDdorSQlc Specs: - Impeller: 29mm with 29mm pitch (18-29mm pitch files included) - Nozzle: 22mm - Hull length: 430mm - Hull width: ~165mm - 9g servo for steering - mounting points for optional reverse bucket and servo - Assembled mass: 1308kg Power system: - 3674 brushless inrunner motor @1900KV. 61A max. Max power 1800w. - 2x 2200mAh batteries, 25C. - 120A watercooled ESC Credit for the included axial jet drive calculation spreadsheet, goes to RCgroups member UnusualRC. UPDATE: I've been notified there is a mistake in one of the formulas on the sheet. Please be aware of that. TODO: - Get video of it at top speed with CoG moved foward running at 6S then retest DONE: - Test boat with 6S configuration. boat is _way_ overpowered which is great fun. SO fast. Gets a lot of air. IN PROGRESS - Make next version with bigger hull - calculations were incorrect and hull sat far deeper in the water than calculations indicated - Improve lid to be more water tight on next version. Other side notes: - batteries, esc and motor all stayed stone cold in 3S mode running at full speed. Motor is wayyy oversized for this boat. - It nowhere near uses the full power available to it running at 3S.