Electric Surf Board

Boats, Jet Skis, Kayaks etc., including hovercrafts
toto44   100 mW

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Re: Electric Surf Board

Post by toto44 » Aug 19 2018 2:39pm

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

https://youtu.be/NewKjySw2ko

srn   10 W

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Re: Electric Surf Board

Post by srn » Aug 20 2018 1:56am

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   10 W

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Re: Electric Surf Board

Post by srn » 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.

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madin88   100 MW

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Location: Austria

Re: Electric Surf Board

Post by madin88 » Aug 30 2018 4:37am

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?
- 10kW belt drive with Neumotor 8057: viewtopic.php?f=30&t=91144&start=50#p1377787
- Fully road legal (L1E approval) e-bike based on Votec V-FR frame
/ MXUS 3T / 17" Mitas MC11 / Adaptto Max-E / 20s12p 25R
- KTM Hardtail Pedelec / eZee V2 6T / 27,5" / Kelly KBSX @ 1,5kW / Torque PAS / CA-V3 / 13s4p Sanyo GA in Shark case

srn   10 W

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Re: Electric Surf Board

Post by srn » Aug 30 2018 6:44am

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€.

toto44   100 mW

100 mW
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Joined: Sep 05 2015 5:40am

Re: Electric Surf Board

Post by toto44 » Aug 30 2018 10:04am

Hello SRN

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

srn   10 W

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Joined: Sep 21 2017 8:50am

Re: Electric Surf Board

Post by srn » Aug 31 2018 9:36am

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.

ropower86   1 W

1 W
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Joined: Dec 05 2016 7:50pm

Re: Electric Surf Board

Post by ropower86 » Sep 02 2018 2:24pm

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?

srn   10 W

10 W
Posts: 68
Joined: Sep 21 2017 8:50am

Re: Electric Surf Board

Post by srn » Sep 03 2018 12:36am

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€.

srn   10 W

10 W
Posts: 68
Joined: Sep 21 2017 8:50am

Re: Electric Surf Board

Post by srn » Sep 05 2018 12:06pm

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

fabianpusch   1 W

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Joined: May 28 2016 5:07am

Re: Electric Surf Board

Post by fabianpusch » Sep 05 2018 2:40pm

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   1 µW

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Joined: Feb 19 2019 3:34am

Re: Electric Surf Board

Post by Christyy » Feb 19 2019 3:59am

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

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Feb 22 2019 1:45am

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   1 W

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Joined: May 28 2016 5:07am

Re: Electric Surf Board

Post by fabianpusch » Feb 22 2019 1:46am

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

ropower86   1 W

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Joined: Dec 05 2016 7:50pm

Re: Electric Surf Board

Post by ropower86 » Jun 11 2019 6:53pm

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:

fabianpusch   1 W

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Joined: May 28 2016 5:07am

Re: Electric Surf Board

Post by fabianpusch » Jun 13 2019 2:49pm

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

ropower86   1 W

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Joined: Dec 05 2016 7:50pm

Re: Electric Surf Board

Post by ropower86 » Jun 18 2019 11:45pm

Here it is fabianpusch
Attachments
myboard.jpg
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ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Jun 18 2019 11:47pm

Where are you standing now with your project? :?:

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Bazaki   10 kW

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Re: Electric Surf Board

Post by Bazaki » Jun 22 2019 4:09am

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

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efMX Trials Electric Freeride   100 kW

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Re: Electric Surf Board

Post by efMX Trials Electric Freeride » Jun 22 2019 12:26pm

Bazaki wrote:
Jun 22 2019 4:09am
Everybody moved to the efoil builders forum:) so many are already riding there electric hydrofoils
link?:)
some ride & sk8 videos:
metacafe.com/channels/NATAS666DAMIEN
http://www.youtube.com/natas666damien
i have nothing for sale.. :)

fabianpusch   1 W

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Joined: May 28 2016 5:07am

Re: Electric Surf Board

Post by fabianpusch » Jun 24 2019 12:42am

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   10 W

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Joined: Sep 21 2017 8:50am

Re: Electric Surf Board

Post by srn » Jun 24 2019 12:49pm

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.
Attachments
surf.jpg
surf2.jpg

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Aug 01 2019 3:57am

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

chris_kline   100 W

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Joined: Sep 20 2017 9:51am

Re: Electric Surf Board

Post by chris_kline » Aug 01 2019 4:06am

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
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chris_kline   100 W

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Joined: Sep 20 2017 9:51am

Re: Electric Surf Board

Post by chris_kline » Aug 01 2019 4:14am


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