Search found 32 matches

by Frizzo
Sep 10 2018 6:16am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1625
Views: 192613

Re: Thread for new battery breakthrough PR releases

Hi everyone. Does someone already noticed the LCB technology? https://www.prnewswire.com/news-releases/prologium-technology-and-weltmeister-will-co-produce-the-first-ev-in-the-world-which-adopts-next-generation-lithium-ceramic-battery-300545258.html Sadly, the website of the company, prologium ltd, ...
by Frizzo
Aug 13 2018 3:42am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

30 cm seems quite long to me. Did you also twist the battery to esc cabels? Can´t see it in the pic of your board.
Maybe that could help already solving a bit of the mistery...
by Frizzo
Aug 12 2018 5:10am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Hi Srn,
With what battery configuration did you go btw?
by Frizzo
Jul 26 2018 3:10pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Hi Fabian. Can you add some pictures of that bottle system? I kinda didn't understand what you men with that. :oops: :P
by Frizzo
Jul 24 2018 7:11am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Hi Srn. I would do it like in the image I attached you. For the dirt I would put a tank filter like the one used in nitro rc cars. link: https://www.ebay.de/itm/L11517-1-5-Mas-Rc-Nitro-Lokomotive-Kleiner-Inline-Legierung-Fett-Benzin-Filter/332728893087?hash=item4d782ffe9f:g:JPwAAOSw5cNYXTti For the ...
by Frizzo
Jun 16 2018 12:24pm
Forum: Items for Sale - Used
Topic: FS: 18650 lithium cell battery 36v 35ah (almost new)
Replies: 1
Views: 502

Re: FS: 18650 lithium cell battery 36v 35ah (almost new)

Hi,
what is the continous and constant discharge rate of the pack?
Cheers
by Frizzo
Apr 17 2018 8:28am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Also, I saw that you are going for a gearbox build. That's actually the way I was going too before I noticed that at that rpm range, the gearbox is going to be really really hot. Did you already think how to cool the gears?

Cheers
by Frizzo
Apr 17 2018 8:25am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Would be interesting to build a flumen. So you actually could measure the impeller effency, the torque, amps, rpm and also optimize the nozzle and stator geometry.

have a look at this:

http://efoil.builders/t/home-made-flume/794
by Frizzo
Feb 20 2018 9:03am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Do you also need to change your battery pack or can it deliver 200 A cont.?
by Frizzo
Feb 14 2018 2:39pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Chris, how is it going? Did you push the motor to its limits already?
by Frizzo
Feb 04 2018 4:52pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Yeah... can imagine that.
Did you take measurements of the ESC temperature and Ampere? Would be interesting to know if the ESC can really handle the 300 A.
And also see if nothink burns out :D
by Frizzo
Feb 04 2018 4:29pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

https://www.youtube.com/watch?v=-sIVpOLYoqg maybe this? Also, how do you think about using this: https://www.amazon.com/gp/product/B01HI1LG2Y/ref=s9_acsd_zwish_hd_bw_bB8qPGN_c_x_w/144-0767002-5635359?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-8&pf_rd_r=QEVC17JK31065RJVXB8R&pf_rd_t=101&pf_rd_p...
by Frizzo
Feb 04 2018 4:14pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Good job dude!
That look's AWSOME!! :D
So I'm thinking to sell my Lehner and buy your same motor.. cheaper and work well too apparently... :)
by Frizzo
Jan 31 2018 2:57pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Well, let's hope for the best!

It also seems to me that your jet unit is kinda going underwater. Doesn't that lead to thrust losses?

Cheers
by Frizzo
Jan 30 2018 6:15am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

That's an amazing work!
Looks like you have choosen a really big volume for your board. Did you run some calculations for that or did you just follow your feeling?
by Frizzo
Jan 01 2018 6:05pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Happy New year!

Chris, You may find some infos in this thread:

https://endless-sphere.com/forums/viewt ... 14&t=26621

Cheers
by Frizzo
Dec 13 2017 9:51am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

That's an amazing job!
Did you seal the edges with epoxy? How thick are the blades?
by Frizzo
Dec 12 2017 3:38pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

to attach an image go here:
Screenshot from 2017-12-12 21-35-22.png
Screenshot from 2017-12-12 21-35-22.png (102.83 KiB) Viewed 1457 times
then, click on place inline
by Frizzo
Dec 12 2017 11:32am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

The Lehner 3060/9 has about 778 rpm/V. Or at least that is what Lehner says. That value is in the Triangular configuration. In Star config. it has 1,73 factor less rpm/V = 450 rpm/V and gains 1,73 factor more torque = 240 Ncm/A in triangular = 415,2 Ncm/A in star... of course I have to test it since...
by Frizzo
Dec 12 2017 5:42am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

When do you actually upload the video at full trottle, ropo? I´ll be very interested to see what is possible to take out from your motor. Also, I wrote to MHZ and ansked how much torque the Scorpion HK-7455-320KV has.... It has a 7,2 Nm Torque. Here is the data table of my Lehner 3060/9 Lasttabelle ...
by Frizzo
Dec 05 2017 11:06am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Hey ropo, here is a tutorial for designing a propeller in inventor: https://www.youtube.com/watch?v=-iVDzhGvre4 for the cast, just do a boolean difference between the propeller and a block of the right size. then you could also 3d print or cnc machine the mould. If you 3d print it, then use ABS so t...
by Frizzo
Dec 03 2017 4:32pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Did you use raw carbon fiber? Would it be possible to get a video or a good explanation (maybe a tutorial :D ) for the prop realisation? :)
by Frizzo
Oct 12 2017 2:26pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

https://www.stefansliposhop.de/Akkus/SL ... :1820.html

This is the battery used in the MHZ youtube videos.

Cheers
by Frizzo
Sep 21 2017 3:47pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Nice to see that you use Rhino for that thou. :)
What´s the nozzle diameter?
by Frizzo
Sep 21 2017 3:40pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 720
Views: 169735

Re: Electric Surf Board

Yes I know, but it should work out with a gearbox. I mean 17 kw... I reduce the rpms and get more torque out of it... or I hope so...
Do you have pics of the stator and the impeller too? What diameter does your jet drive and your nozzle have?

Cheers