jet boat

3 Articles

Electric Surfboard Doesn’t Need Waves

September 8, 2020 by 20 Comments

Surfing is a majestic sport, but one which relies heavily on the environment to provide suitable waves for the practice. If you don’t live near the right piece of coast, you’re simply out of luck. Of course, you could always build yourself an electric board instead to tear up the local lakes – and that’s precisely what [Simon] did. 

Following on from earlier experiments with 3D printed boats, the board is powered by a pair of jet drives, sourced from [YOUNGSTERS JETS]. Not one to skimp on horsepower, [Simon] selected twin 5000W motors to provide plenty of motive power. Of course, operating at such power levels comes with some headaches, and there’s plenty of blown ESCs and damaged motors along the way. Perseverance and plenty of cash outlay later, and the board is out carving elegant lines in the water at over 45 km/h.

Future updates aim to solve the problem of water ingress into the electronics, particularly the hand controller, of which [Simon] has already ruined two. We look forward to seeing more of these craft out in the water in coming days, particularly as they’re at least 30% less loud and annoying than the common jetski. Video after the break.

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5 Kilowatts In A 3D Printed Jet Boat

November 14, 2019 by 10 Comments

Radio control projects used to be made of materials such as metal or wood, and involve lots of hand crafted parts. That’s still one way to go about things, but 3D printing has become a popular tool in recent years. [RCLifeOn] has been working on a 3D printed jet boat, which recently got a serious power upgrade.

The boat in question received a 5000W brushless motor – significant power for a vehicle weighing less than 2kg. Powered by a 12S lithium pack, and outfitted with a water jacket for cooling, it drives the boat through an off-the-shelf turbine after initial attempts to DIY the drivetrain were unsuccessful.

The biggest problem in the project came from coupling the motor to the turbine. A 3D printed coupler was unable to hold up to the strain, while attempts to make a metal part failed due to the lack of a lathe. Eventually the solution was found by daisy chaining two off-the-shelf parts together.

The boat proved itself ably on the water, with the large motor proving more than capable of shifting the boat at a strong clip. It’s an excellent shakedown for the parts that will eventually find themselves in a powered surfboard build. We’ve seen [RCLifeOn]’s work before, too, like these stylish 3D printed sneakers. Video after the break.

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3D Printing A Water Jet Drive

April 30, 2019 by 16 Comments

[Ivan Miranda] is always experimenting with 3D printing, and recently has been taking his work on the water. His latest creation is a racing paddle boat, but its performance left [Ivan] with a need for speed. Cue the development of the 3D printed water jet engine (YouTube link, embedded below).

The basic principle of operation is simple. Water is sucked through an inlet, where it is accelerated by a turbine driven by a brushless motor. This turbine, in combination with stator fins, forces the water through the outlet, propelling the boat forwards in the process.

The first prototype is printed in PLA. Tolerances are good, thanks largely to [Ivan]’s experience and well-calibrated printers. After assembly, the engine is fired up, to great results. After sourcing a series of larger tubs in which to test the device, the engine is finally run up to full throttle and appears more than capable of shifting a serious amount of water.

We’d love to see a proper instrumented thrust test, particularly one that compares the device to other water jet drives on the market. Brushless motors make a great drive solution for RC boats, so we’re sure [Ivan] will be tearing up the lake real soon. Video after the break.

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