3D printed Jetsprint jet boat V1

youmagine

VERSION 1 IS OUT: https://www.youmagine.com/designs/prototye-3d-printed-jetsprint-jet-boat-v1 Forum thread: https://www.rcgroups.com/forums/showthread.php?3061105 A personal project I've been working on. Posting here since there aren't many 3D printed jet boat designs available. lijingwei made one too. He's also made some improvements. You can find these here: https://www.thingiverse.com/thing:2890755/remixes My boat's maiden outing: Specs: Impeller: 29mm with 25mm pitch (18-25mm 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: 1308g 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 forward 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 watertight 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.