Propellers and Ducts


#124

Show the propeller from several directions to make it easier to see. Only then will the propeller be easy to judge.


#125

Please have a look here:


Question is, if outlet vanes could increase the efficiency. How could they be shaped?


#126

Your setup looks great!

I plan to try the same setup as yours with different props and two motors I have powerglider 100kv and turnigy sk3 149kv ( with two blade prop - should be more efficient).
@PowerGlider, can you please share your enclosure and motor mount design, so I can try it ( also outlet vanes as well). I think outlet vanes should be thin and just straight ( as per your shared video and my personal investigation) probably motor enclosure supporters should be angled in opposite to rotating direction


#127

I have ordered 100kV MP56115 inrunner motor with 14s 300A watercooled esc.
My setup: 12s 20Ah liion battery, direct drive, loaded rpm about 3500rpm. Target speed 35-40km/h (min 30km at first)
Could you suggest the prop for this setup?


#128

To proksa1: In order to be able to select the correct propeller for the e-foil, you must first measure the drive torque (http://www.efoil.builders/t/part-1-when-to-select-the-right-impeller-for-jet-propulsion-or-the-right-propeller/1530)


#129

I want to use it for old surfboard, not for efoil.


#130

This principle is universal - it’s not only for e-foil, but also for surfboard and Titanic


#131

You can leave the edges sharp!


#132

I shared a link on another thread to a Free Impeller Design Software if you guys are interested: Jet Propulsion?


#133

Currently exploring the different options for waterproofing my motor shaft with the printed housing. Will something as simple as a mechanical seal get the job done? Or even just a rotary shaft seal? Or will more drastic measure have to be taken?


#134

Just for inspiration: https://youtu.be/v1p8Fon9Ykg

A guy build his own EDF blades from carbon fibre.


#135

or : https://www.youtube.com/watch?v=sO9zJ0BKDFI

:wink:


#136

i use this: https://www.123roulement.com/joint-OAS-12X20X6-FPM.php


#137

man these carbon guys are just sickly awesome! thanks for sharing!


#138

Hey @WNT,
I want to try an old jetski impeller, what’s your take on that?
It’s a Skat-Trak USA 9-17


#140

http://www.improvingyourmokai.com/index.php?topic=11.0


#141

HI VeFoil,
Do you have results on your 220KV new inrunner motor and 80mm duct? What was the pitch most efficient in this case? I appreciate if you can share your measurements with this duct.


#142

Hi @tunnelvision, Can you please share again your prop and duct design? The dropbox link is expired and doesnt exist anymore.


#143

I planning to use that motor but still dont know how to design prop with javaprop…really need help now


#144

Set water density in place of air on last tab, set small hub size and a sligthly larger prop diameter on first tab, define max rpm and a reasonable speed, depending on your motor, you could have 3000W of power avaliable, more or less, design the prop, go to tab 3 and modify it, if needed, go to tab 2 “export as iges”.
Open it with a cad software (I use Solidworks), close the blade gaps to have a solid, cut the prop in 4 slices, get the profiles from any slice and loft a new blade, start scaling each profile but DON’T move it around, you need to figure out by yourself. It’s time consuming at the beginning but you can have a very good looking prop in one hour or less, after dialed in the process. Check on some thread about prop, I put some photo and more detailed explanation