TinyJetSki - micro rc twin jetboat - world smallest!!

TinyJetSki is a new and Improved version of the Tiny JetSkY MK1

NOW WITH FPV COVER

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Hello Tiny JetSki!

v2 of the WORLD'S SMALLEST PRINTABLE RC WATERJET MICRO RC BOAT

With minifigure compatible cover and FPV cover!

Smaller, faster, better

Improvements over TinyJetSky MK1:

Easier to build ,less parts required, you need 4x 8520 or 7020 coreless motors commonly found in toy drones and planes and the electronics to control it.

Totally redesigned new hydrodinamic hull for a faster and more manouvrable driving experience, check out the video.

Snap-in cover latches that really hold the cover in place.

Improved and more powerfull jet pumps, propellers and nozzles

Twin water pumps, with a single central water intake design

Electronics board/fc supports.

Direct contact watercooled motors.

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VIDEOS

• Running Video

• Building video

• CX-10 board hacking to disable gyro:Recycling CX-30 Electronics

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SIZE

Boat Lenght: 129mm
Boat Width: 51mm
Boat Height: 32mm
Boat hull weight: 15g
Boat Weight ready to run: 42g

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Parts files list:

• Hull:
  . Body 8520motors.3mf for 8.5x20mm coreless motors
  . Body 7020motors.3mf for 7x20mm coreless motors

• Cover: racingCover.stl or MINIFIG-Cover.stl

• 2 @Nozzles: 8520 nozzle.3mf or 7020 nozzle.3mf depending wich motors you use

• 2 @Propellers: propeller.stl

• 2 Shaft joints: Joint.stl

@ = the nozzles and propellers must be duplicated in the slicer software and one copy must be mirrored on the X axis.

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Additional parts list:

The project is based on recycled parts of old rc toys, but you can buy them following the links in the list below!
Many micro RC enthusiasts probably already own most of the hardware needed for this project such as unused rc veichles, spare parts or scrap. recycle!!

Simplest way, get a cheerson CX-30, get all the parts from it, hack the eletronic board to disable the gyroscope and accelerometer(what i'm using now! check the building videos)!
here is on sale:
Cx-30 : https://s.click.aliexpress.com/e/_A9sMth
You can still find it in various eshops

Or separated parts:

• 2x 8.5x20mm brushed motors with 4x 9t nylon pinions.
  Motors with t9 pinions
  Only Nylon gear pinion 1mm 9T
  Other 8520 Motors and t9 pinions:

• 2x drive shafts, 1x21.5mm, can be recycled from 2x8.5mm brushed motors

• 4x bushings: 1mm inside x2mm outside x1.5mm lenght ( can be recycled from the same 2x8.5mm brushed motors, see this video for a how-to tutorial.

• 2x Esc or 2in1 esc
  2in1
  Brusehd Esc 10A
  smaller Brushed Esc 5A
  TinyDrive V1 esc TinyDrive

• 1x Receiver 4ch 2.4ghz
  4ch 2.4ghz Receiver requires jp4in1 multiprotocol transmitter like this or a compatible 2.4g transmitter

• Lipo HighVoltage battery
  LiHV ~300mah 1S (check your board battery plug type, you might need and adapter)

• LipoHV charger
  LipoHV USB 1s charger

• CA glue for fixing the nozzles & joints.

To control the boat engines, alternatively it is possible to:

• Try to hack a old drone board using MPU-6050/6000 to disable the gyroscope and accelelerometer(what i'm using now!) and use the drone transmitter or if the board protocol is compatible a jp4in1 multiprotocol transmitter like this
  In the download package you will find more information on how to try to disable the gyroscope and accelerometer in toy drone's boards using the MPU-6050/6000 invensense through a simple hack(no guarantees for the non cx-30 boards)

• Flash NFE experimental firmware forks for hovercrafts on silverware compatible boards(beecore lite, whoop lite) not for beginners.

• To use an aio betaflight brushed flight controller like the BeeRotor TinyBeeF3 Controller by changing the pid values/betaflight settings to supress gyro/accell changes.

• Use other toy's boards that already have 2 integrated escs like small rc twin motor planes, with their remotes

• To recycle servo's eletronics to use them as tiny brushed escs. Search the instructions on youtube.

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Building instructions:

See the included SETUP.jpg image for the motor/propeller/nozzle setup.

The pump and motor shafts are connected thru a printed joint that must be glue between the grains. See building video

Drop a drop of CA glue in the cuts under the motors from the bottom when the build is done. See building video

Paint some liquid rubber over the cover support to waterproof it.

Contact me to order it preassembled and ready to run and for any question regarding the building process.

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Is it watertight?

Yes once built propetly but i strongly recommend covering the circuits with nail varnish or a dedicated protective product, put the battery in a small waterbaloons and keep a piece of sponge inside the hull.
Water protection spray for electronics

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LICENSE

Object License - Standard Digital File Store License

Remixing Not Allowed
Commercial Use Not Allowed
Add Credits To Designer When Sharing Links, Photos and Videos of Objects

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Updated:

• 21/05/2022 Published
• 04/072022 Fixed small bug on MinifigCover
• 06/06/2022 added joint to use without t9 nylon pinions
• 08/06/2022 enlarged the shaft hole and modified the pump to reduce the shaft deviation.
• 03/07/2022 Added version for 7020 motors!
• 08/07/2022 Added FPV cover!
• 04/08/2022 removed new longer prop, has bad performance in speed.
• 14/08/2022 added proper building video
• 01/11/2022 added Clean version (no TinyJetSki logo on the sides) for 8520 motors 04/11/2022 Added Body, Propeller and Nozzle in "7020" versions to use the 1.8mm diam. bushings that come with the 7020 motors, so it can be built with solely the parts from 7020s. Added Clean(No Logo on the sides Version for 7020. Progressively transitioning the file format to .3mf.
• 05/11/2022 Improved Nozzles design and ease of print.
• 08/11/2022 Fixed a Major bug of the 7020 version introduced with the last updates. Added experimental latereral stabilizers to the 7020 version.

- 09/11/2022 Fixed a bug in the hull introduced with the last changes that could cause the print to fail at 20%

Possible updates and releases:

• New modern body design
• Floating Racing tracks parts
• micro hydrofoil with same eletronics

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Check out also the just released

SapoLAB_DIY

#TrollingBot The Semi-autonomous fishing/cinematic rc boat

• 12.5k views
• 16 likes
• 26 downloads
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• 1 make

Download US$ 29.05

For Cura
0.12 Layer height
0% infill
2 lines of brim
4 wall line count
3 bottom/top layers
no supports
Cura 5 is reccomended for printing covers, nozzles and props.