Pump Jet (32mm 2212/2216/2217/2440 Motor)

An offshoot of my project https://www.thingiverse.com/thing:4606971 RC Pump Jet boat, I modeled a stand alone water jet originally intending boat to be modular in design. After consideration I decided to just integrate the pump jet with the boat body rather than try to seal the modular parts against water ingress.

Needz MOAR pump?  4/3 scaled pump and parts here https://www.printables.com/model/413647-rc-boat-pump-jet-boat-large-yao-kong-chuan-pen-she saved as inlet duct flanged

This model might still be useful for someone though. I've also kept the motor separate from the pump jet in case you want to model your own motor housing for different motors.

With the 3/19/2021 updates to stator and nozzle it reliably runs at all thrust levels once primed - smoothing and water proofing the inner running surfaces of the pump inlet via wax, epoxy or other means is recommended for reliable operation.

There is a split line at the motor mount, this is there in case you want to follow the same design philosophy as my boat project where the motor mount joins the two halves of your printed boat. Also note that for the part Inlet Duct you will need to specify supports touching build-plate as there is an unavoidable overhang for the mounting flange otherwise print settings will be the same as specified for the boat project mentioned above. Depending on your weight limitations you might want to specify more walls than my boat project to make the parts sturdier - I was constrained by the displacement of my hull.

Note caution is warranted with the cooling impellers - the layer adhesion issues inherit to 3d prints makes it possible for the impellers to fracture under load. Wear eye protection and be mindful of risk when using. For added safety consider printing cooling impellers in TPU - higher layer adhesion should make failure less likely. Slicer setting recommendations can be found in my boat project

BOM:

• Motor Options:

  • 2212 https://www.aliexpress.com/item/32672300112.html or https://www.aliexpress.com/item/1904754775.html, the gateway motor, something between a 1400 KV and 2000 KV might be good.

  • 2216 https://sunnyskyusa.com/collections/x-v3-motors/products/sunnysky-x2216 Sunnysky 2216 motor, going to test a 2600 KV motor soon - these angreh little kittehs push over 750 W of power from a ~70g package >o.o< really impressive performance - no gps telemetry yet for speeds but this is by far the fastest option - paired mine with a 60 amp ZTW shark esc

  • 2217 https://www.aliexpress.com/item/2255800146800490.html I used a 2300 KV motor combined with a water cooled esc and the direct vent boat body + cooling impeller for the pond pictures featured

  • 2440 water cooling motor ZTW https://www.aliexpress.com/item/4000425168430.html, note you will need to use water cooling version of the stator / cover and verify it is supplying enough cooling water to the motor and ESC. KVs (4500) on suggested motor might be high for the size of the impellers. I am not sure if all 2440s and water cooling sleeves are built to similar dimensions but you might want to substitute with a lower KV motor if you have one

• Prop: https://www.aliexpress.com/item/32714017489.html

  • If 2212 Motor L10 Shaft 3.18 mm (motor) Cardan

  • if 2216 Motor L10 Shaft 5.00 mm (motor) Cardan - still testing

  • if 2217 motor L10 Shaft 4.00 mm (motor) Cardan

  • If 2440 Motor L15 Shaft 2.3 mm (motor) Cardan

• ESC: Water proof ESC appropriately rated for your motor

• Servo: sized for 9g servo https://www.aliexpress.com/item/1005002219839349.html

• M3 X 6 X 5.3 Embedded Nuts (old link no longer works - possible substitution M3 X D5 X L6) https://www.aliexpress.com/item/4000232858343.html (also if using 2217 some 3mm high nuts are needed)

• M3 Machine Screws (Button head and Flat head) https://www.aliexpress.com/item/32798146322.html or stainless https://www.aliexpress.com/item/32934186482.html

For build instructions please go to post processing pictures at project https://www.printables.com/model/291645-rc-boat-pump-jet-boat-yao-kong-chuan-pen-she-beng

Category: R/C Vehicles