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Re: Electric Surf Board

Posted: Aug 19 2018 2:39pm
by toto44
Today I tested my 3D printed jetdrive. Could not do any measurements, but gives a lot of power.

https://youtu.be/NewKjySw2ko

Re: Electric Surf Board

Posted: Aug 20 2018 1:56am
by 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 ?

Re: Electric Surf Board

Posted: Aug 30 2018 3:37am
by srn
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.

Re: Electric Surf Board

Posted: Aug 30 2018 4:37am
by madin88
srn wrote:
Aug 30 2018 3:37am
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?

Re: Electric Surf Board

Posted: Aug 30 2018 6:44am
by srn
madin88 wrote:
Aug 30 2018 4:37am
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€.

Re: Electric Surf Board

Posted: Aug 30 2018 10:04am
by toto44
Hello SRN

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

Re: Electric Surf Board

Posted: Aug 31 2018 9:36am
by srn
toto44 wrote:
Aug 30 2018 10:04am
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.

Re: Electric Surf Board

Posted: Sep 02 2018 2:24pm
by ropower86
srn wrote:
Aug 30 2018 3:37am
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?

Re: Electric Surf Board

Posted: Sep 03 2018 12:36am
by srn
ropower86 wrote:
Sep 02 2018 2:24pm
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€.

Re: Electric Surf Board

Posted: Sep 05 2018 12:06pm
by 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.
Controller 2 history 2018-09-05 18-34-39.png

Re: Electric Surf Board

Posted: Sep 05 2018 2:40pm
by 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.

Re: Electric Surf Board

Posted: Feb 19 2019 3:59am
by Christyy
Hello, about electric surfboards, and more specifically to buy one. What do you think of these https:// awakeboards.com, is it worth investing?

Re: Electric Surf Board

Posted: Feb 22 2019 1:45am
by 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.

Re: Electric Surf Board

Posted: Feb 22 2019 1:46am
by fabianpusch
Important, not the peak Amps....the real Amps from the battery

Re: Electric Surf Board

Posted: Jun 11 2019 6:53pm
by ropower86
I see we all went ghost on this post :lol: :pancake: . 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. :bolt:

Re: Electric Surf Board

Posted: Jun 13 2019 2:49pm
by fabianpusch
That Sounds really nice...
Now I am a little curious :D
Show some pics please to reanimate this old and dusty thing....

Re: Electric Surf Board

Posted: Jun 18 2019 11:45pm
by ropower86
Here it is fabianpusch

Re: Electric Surf Board

Posted: Jun 18 2019 11:47pm
by ropower86
Where are you standing now with your project? :?:

Re: Electric Surf Board

Posted: Jun 22 2019 4:09am
by Bazaki
Everybody moved to the efoil builders forum:) so many are already riding there electric hydrofoils

Re: Electric Surf Board

Posted: Jun 22 2019 12:26pm
by efMX Trials Electric Freeride
Bazaki wrote:
Jun 22 2019 4:09am
Everybody moved to the efoil builders forum:) so many are already riding there electric hydrofoils
link?:)

Re: Electric Surf Board

Posted: Jun 24 2019 12:42am
by 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.

Re: Electric Surf Board

Posted: Jun 24 2019 12:49pm
by 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.

Re: Electric Surf Board

Posted: Aug 01 2019 3:57am
by chris_kline
I spent a year messing around with my jetboard, but every time i took it out, there would be some electrical problem. the esc kept blowing the caps, mgm are literally the wors company to deal with from a customer care perspective.
i made external caps banks, which helped, and made an additional watercooled heat exchanger for the esc, which helped again.

by now my batteries have been cycled around 50 times, and im starting to loose individual cells, so the packs need to be pulled apart and cells individually checked.

heres a video of the last run i did on new years eve https://www.youtube.com/watch?v=QnzaSyV ... e=youtu.be

Re: Electric Surf Board

Posted: Aug 01 2019 4:06am
by chris_kline
eventually i got so sick of the problems with the esc, mgm, and the cells, that i built a gas jetboard from a 2 stroke racing kart engine.

i know this is an electric power forum, but i hope you dont mind me posting a couple photos and video of the second jetboard i made.
here it is part way through construction

Re: Electric Surf Board

Posted: Aug 01 2019 4:14am
by chris_kline