Search found 52 matches

by ropower86
Dec 13, 2017 10:37 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

myboard2.jpeg
by ropower86
Dec 13, 2017 10:30 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

myboard.jpeg
All my photos are massive in size so I had to reduce it multiple time just to get it under 512kb. :wink:
by ropower86
Dec 12, 2017 11:08 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Frizzo wrote:
Dec 12, 2017 3:38 pm
to attach an image go here:

Screenshot from 2017-12-12 21-35-22.png

then, click on place inline
Are you kidding me!?!?!?! All this time I was struggling to add pictures for the longest since Ive been on here. I had never paid attention to the bottom. :lol:
by ropower86
Dec 12, 2017 12:18 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Image
by ropower86
Dec 12, 2017 8:54 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

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 ropower86
Dec 12, 2017 8:29 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

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 ropower86
Dec 11, 2017 11:11 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

About the 3d print impeller, Yes it does hold up pretty well in the water even with tremendous loud. The impeller has to be printed at 100% infill, in 0.1mm or 0.2mm and set as a high quality which takes longer. Yes, it was in PLA.
by ropower86
Dec 10, 2017 9:51 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

I used PE because Epoxid Resin should not stick to it. But because of a too rough surface, it is sticking like hell .. For my second Impeller, I applied normal candle wax on the surface. This worked very well. You should use pva film that is used in mold release to make it a whole lot easier for yo...
by ropower86
Dec 10, 2017 9:46 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

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 ...
by ropower86
Dec 04, 2017 7:25 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Wow, you are flying and putting this together pretty fast! Do you have some engineering background in the watercraft field or some sort? It had taking me a verrrrrrryyyy long time to put a jet drive together. :lol: About your tig job you did pretty good, I use to be a top-flight in tig welding, I h...
by ropower86
Dec 04, 2017 7:21 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

oh the prop ended up being 79mm diameter with 70mm pitch. the reason was thats what the stainless tube was available in for the main chassis of the jet drive Wow, you are flying and putting this together pretty fast! Do you have some engineering background in the watercraft field or some sort? It h...
by ropower86
Dec 04, 2017 7:20 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

right now im not at the location with my prop mould. but heres the 3d model of it. and fresh out of the oven, a carbon fin! Pure Beauty in front of my eyes from the screen!!! I wish I can have your skills right now.... Do you share files? I have Autodesk too. I am almost jealous right now of your m...
by ropower86
Dec 04, 2017 7:18 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

oh the prop ended up being 79mm diameter with 70mm pitch. the reason was thats what the stainless tube was available in for the main chassis of the jet drive Wow, you are flying and putting this together pretty fast! Do you have some engineering background in the watercraft field or some sort? It h...
by ropower86
Dec 04, 2017 7:18 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

srn wrote:
Dec 04, 2017 3:31 pm
here my mould out of PE.
How many impellers have you made out of the PE's negative mold?
by ropower86
Dec 04, 2017 6:59 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

I made my impeller very similar. Produced two negative forms with CNC mill, then applied epoxid resin and small pieces of carbon fiber until i had approx. 5 - 10 layers everywhere. With weights i pressed both forms together with the propeller in the middle. At the end I got the impeller as shown at...
by ropower86
Dec 04, 2017 6:57 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

oh the prop ended up being 79mm diameter with 70mm pitch. the reason was thats what the stainless tube was available in for the main chassis of the jet drive Wow, you are flying and putting this together pretty fast! Do you have some engineering background in the watercraft field or some sort? It h...
by ropower86
Dec 01, 2017 10:58 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

chris_kline wrote:
Nov 23, 2017 11:08 am
hi guys. if anyones interested, here are some progress pics.
I like your tigging work, Im a tig welder myself too. What size impeller and did you made it with a 5 axis CNC? How long did it take you to put that masterpiece together?
by ropower86
Oct 12, 2017 1:51 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Saw some updated info about Onean on their Facebook page. I'm sure the info is somewhere in this thread already. I'll repost for my own. Their Carver board uses 48v batteries at 20ah. https://scontent.fsnc1-1.fna.fbcdn.net/v/t1.0-9/20229116_670952183093820_5437740488408359471_n.png?oh=afe0e8e250398...
by ropower86
Oct 11, 2017 2:51 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Here' my jet-board, I will post another video of it going faster soon. https://www.youtube.com/watch?v=lz2sp_sXylg Hello, I saw in your youtube comment, that you spend approx. 30.000$ for this project ? It surprises me because you use basic components. Which major problems/cost drivers did you had ...
by ropower86
Oct 10, 2017 5:58 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Here' my jet-board, I will post another video of it going faster soon.

https://www.youtube.com/watch?v=lz2sp_sXylg
by ropower86
Aug 15, 2017 7:44 am
Forum: Battery Technology
Topic: Greenworks 40v 4Ah Battery-Whats inside????
Replies: 37
Views: 9970

Re: Greenworks 40v 4Ah Battery-Whats inside????

I completely forgot I even had posted this topic. But I still use these batteries to this day. I actually sold 2x of the packs to someone here in ES so I discharge at 20s 8ah 80 cells I don't know why I sold two of them but its been over a year now. I think its because I was using a EBIKE ev global...
by ropower86
Aug 07, 2017 5:32 am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Good Morning to everyone, I'm following this topic quiet long time and considering to make my own e-jetsurf. The place i live has a huge lake but very shallow and that's why would be ideal a jet system for the board. Gas is prohibited(environmental reasons) so electric the only option. As i was rea...
by ropower86
Aug 04, 2017 4:50 pm
Forum: Motor Technology
Topic: Fliermodel ESC 22S 500A 25kW - Photos and Test Results
Replies: 8
Views: 1309

Re: Fliermodel ESC 22S 500A 25kW - Photos and Test Results

' Since we have limited test data on these "high powered" ESC, I want compare everything we can with the Alien 24S 420A ESC and why it failed at 80V and 100A. There is so much to consider: 1) Test voltage and current 2) Fet type and quantity 3) Capacitor type and quantity 4) Cooling fans, heat sink...
by ropower86
Aug 04, 2017 4:49 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

ropower86 wrote:
Bazaki wrote:Hmmm that is interessting. I now have the 500A flier controller. Of is very very big and Heavy. I was hoping that this 500a controller can do it better.
By the way, what is the motor wire gauge?
Check this out:
https://endless-sphere.com/forums/viewtopic.php?t=84783
by ropower86
Aug 04, 2017 4:16 pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 479
Views: 99132

Re: Electric Surf Board

Bazaki wrote:Hmmm that is interessting. I now have the 500A flier controller. Of is very very big and Heavy. I was hoping that this 500a controller can do it better.
By the way, what is the motor wire gauge?