Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

RC Jet boat pump

by maciej_ratka, published

RC Jet boat pump by maciej_ratka Oct 15, 2017

Design Tools

Fusion 360

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6019Views 1467Downloads Found in R/C Vehicles


This Jet Pump was designed as a modification to a old R/C boat I have. with an impeller diameter of 26mm it is quite large for the scale of the boat.

The Intake features Intake strakes to minimize ingestion of pond weeds and was designed around the input shaft in a brass sleeve with a O/D of 5mm.

The nozzle has a turning angle of 50 degrees and uses a 1.5mm ~ 40mm long steel pin as pivot and means of controlling the nozzel

Print Settings




0.2 (0.1 for impeller)




I used the concentric lines infill pattern when printing the parts.



Once All Parts are printed it is best to assemble the nozzle section.
First Insert the "Nozzel" into the "Rear" section aligning the pin hole and inserting a 1.5mm steel pin through it all and apply a little dab of superglue (I use loctite 401) to the inside to the "Nozzel" to secure to the shaft then press on the "arm" to the metal pin protruding from the top of the "rear" and secure that to the top of the shaft with another dab of superglue. (see Video and image below on how it should look).

The pin should be free in the "rear" but a tight almost press fit in the "Nozzel"

Fully assembled rear section.

Assembled nozzle movement.


Step 2 is to simply spread the arms of the the "reverser" and click them onto the pins of the "rear".

Black part on right is adapter ring.

OPTIONAL STEP - Adapter ring

If you want to play around with impeller options or don't want the rear to be stuck on permanently with superglue or in my case once the intake was fitted the join to the rear was just not good enough. you can use the adapter ring, I have super-glued one end into the rear section and it is a tight fit into the Intake section that I plan to put silicone RTV compound on it to keep the rear section in place. (NOTE 4)


Once the intake is printed run a 5mm drill through the input shaft hole, and remove supports, then I cut a 30 by 50mm hole in the base of the hole (ended up being closer to ~53mm to get the intake to fit) when installed correctly the flange at the bottom by the intake grate should be on the outside of the boat. I secured the intake to the boat with superglue around the flange then sealed everything on the inside of the boat and around the intake on the outside with a sealant (I used a polysulfide based sealant but anything will work)

Intakes pre-sealant

Intakes post sealing

Inside post sealing (a bit messy but it works)


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i really like this design. its fairly easy to print and its ideal for my application. i was just wondering what material you used?

You don't happen to have better detailed pictures of how it's put together? I like the design very much because it looks to be more protected than what I have now but I try to figure out how it's put together and if it will work on my boat.
What size motor are you using for it?

Hello, I'm not sure what motors are on the boat since there are no markings on the motor, all I can tell you is it's a brushed DC motor designed to run on ~7.3V with a diameter of 27.5mm, length of 39mm and a shaft size of 2.3mm, I will create a drawing of how I put the pump unit together and will upload it hopefully today but probably in the next few days.