Electric Surf Board

[toto44]

Today I tested my 3D printed jetdrive. Could not do any measurements, but gives a lot of power.

https://youtu.be/NewKjySw2ko

[srn]

Hello toto44,

good video, looks like a lot of thrust for this small motor. Do you have a log of motor/esc power during this run ?

[srn]

Hello,

i changed my carbon impeller to a 3D-printed steel impeller. It is really impressive quality and less vibration.

today I will make first measurements of power consumption. Will provide results later.

[madin88]

Hello,

i changed my carbon impeller to a 3D-printed steel impeller. It is really impressive quality and less vibration.

how much did it cost?

[srn]

how much did it cost?

I ordered a 62x62mm. They said that it will shrink 2-3% after thermal treatment and finally I got a 60.5 x 60.5 impeller.
It is ~95€.

[toto44]

Hello SRN

what pitch does your impeller have? Did you balance it?

[srn]

Hello SRN

what pitch does your impeller have? Did you balance it?

Hello toto,

the pitch is 60mm or equal to D if you scale it.

I have not balanced it yet.

[ropower86]

Hello,

i changed my carbon impeller to a 3D-printed steel impeller. It is really impressive quality and less vibration.
IMG_3664.jpg

today I will make first measurements of power consumption. Will provide results later.

How much did it cost you to 3d print in metal?

[srn]

How much did it cost you to 3d print in metal?

I ordered a 62x62mm. They said that it will shrink 2-3% after thermal treatment and finally I got a 60.5 x 60.5 impeller.
It is ~95€.

[srn]

hello guys,

i am still testing in my small pool.
now my remote control is working fine. Also the new propeller is doing a very good job.

here my current MGM log. I wonder that I have really small power consumption at 10.000 rpm. At the moment I limited the MGM to 10k rpm for testing. Will try 12k rpm in a bigger pool soon.

[fabianpusch]

Hi
are you sure that there is really load on the system?
It seems to be really a too low power consumption.
Could be an issue of water mixen with air, less stress for the motor to handle / put through your jet...
On the other side, try to accelerate up to 14000, and measure the pulling force.

[Christyy]

Hello, about electric surfboards, and more specifically to buy one. What do you think of these https:// awakeboards.com, is it worth investing?

[fabianpusch]

It is absolutely clear, you have an issue with a mixture of water and air.
Normally you should have during ramp up by 10000 rpm something between 120-160 Amps.

[fabianpusch]

Important, not the peak Amps....the real Amps from the battery

[ropower86]

I see we all went ghost on this post . It seems like we all figured it all out. I will be testing soon, in the fiberglassing stage then Gel coat. I will be making a mold and start producing DIY jetboards if things go well with my new design.

[fabianpusch]

That Sounds really nice...
Now I am a little curious
Show some pics please to reanimate this old and dusty thing....

[ropower86]

Here it is fabianpusch

[ropower86]

Where are you standing now with your project?

[Bazaki]

Everybody moved to the efoil builders forum:) so many are already riding there electric hydrofoils

[efMX Trials Electric Freeride]

Everybody moved to the efoil builders forum:) so many are already riding there electric hydrofoils

link?:)

[fabianpusch]

https://efoil.builders/

Here it is...
But they are really focused on Foilboards.
But still interesting....

At ropower any test rides done yet?
Looks short, really short.
I am interested about the feedback.

[srn]

I did some progress and now only wait for vacation to do some water tests.

I especially modified my batteries. Now running on 48 pcs 20700 liion cells, 12S4P. Each parallel pack with own 60A BMS.
I also build a power distribution board, where I put in all battery packs and charger (for charging all of them simultaneously. It has a display with voltmeter, a hall sensor for current measurement and 8 additional capacitors.