Propulsion System - Motors, Gears, etc

#467

Hi Kappertz, could you tell us were did you find those parts?
Thanks

#468

Hi Semih, the correct size is nema 23, that is the same of the Parker PV40TN, and there are a lot of them at Ebay.
About the durability, I don’t know.

#469

It’s from the german company MHz: https://www.mhz-watercraft.com/jets/549/hydrofoil-set-impeller-duese-stator-lager?c=109

#470

Hi Kappertz,

That looks like a great design you made for the jet mount, would you be willing to share your STL file?

Thank you,

Phil Kite
Alberta, Canada

#471

Sure, I can share it. There’s one problem though: in my first design, the water inlet was way smaller. In an attempt to improve thrust, I over did and now you can slightly twist the jet mount against the base (at least when printed with SLS). The optimum design is somewhere in between. Maybe I should rather post the upcoming version 3.

#472

IMG_20180922_141015
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#473

@Sokol
Hi Boris,
is it working? Are you testing? Tell us more, please.

#474

The engine is too slow 6-7 km / h on 12v, 500w

#475

Thank you. This result is no surprise to me if the motor is still in original condition. I own similar trolling motors (up to 1450 W, for use on boats). The usual rpm and the propeller pitch prevent a higher speed. But I think, a different setup could be successful, because there are types in the needed power range.

#476

I have wanted to try this!
Could you try changing out the propeller and getting a little more horsepower out of it?

#477

I opened the engine to see if there was a gearbox but there was none. I can try at higher voltage. What propeller would you offer?

#478

IMG_20190126_020356
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#479

Pacificmeister has some CAD files on good Propellers Pacificmeister Build Info and CAD Sources

I think this one might work too.

#480

Hello! Do you think how much thrust has a jet pump with a 40mm propeller? 1200w will they suffice?

#481

You need at least 2x 50mm 2000w each imho

#482

probsbly like 8-10 kg max

#483

Seen this 120kv. Waterproof.

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#484

25%20
Skärmavbild 2019-02-12 kl. 22.42.25 .png723×504 136 KB

Looking at the PM-build; what do you do to prevent waterleaks between the lipseals and the printed plastic part called “Seal mount”? Seems to me that the somewhat rough 3d-printed surface will seal badly against the outer side of the lipseals? Do you sand it? Silicone it? What do you say


#485

Available from Aliexpress for 350USD+ 40USD shipping -
not bad, eliminates need for almost everything else, except mast clamp and - if you want it - Prop-guard.
On the other hand it has 75mm diameter (more with mast-clamp) so it will have higher drag and it will probably need 14s and up; last not least it is heavier than Pacificmeister’s design.
Still, I like it :slight_smile:

#486

Definitely interested in hearing feedback if anyone tests one of these motors.