Search found 70 matches

by ropower86
Dec 10 2017 9:51pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 9:46pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:25pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:21pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:20pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:18pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:18pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

srn wrote:
Dec 04 2017 3:31pm
here my mould out of PE.
How many impellers have you made out of the PE's negative mold?
by ropower86
Dec 04 2017 6:59am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 6:57am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 10:58pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

chris_kline wrote:
Nov 23 2017 11:08am
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 1:51pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 2:51pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 5:58am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 7:44am
Forum: Battery Technology
Topic: Greenworks 40v 4Ah Battery-Whats inside????
Replies: 38
Views: 16172

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 5:32am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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 4:50pm
Forum: Motor Technology
Topic: Fliermodel ESC 22S 500A 25kW - Photos and Test Results
Replies: 9
Views: 4383

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,...
by ropower86
Aug 04 2017 4:49pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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:
viewtopic.php?t=84783
by ropower86
Aug 04 2017 4:16pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

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?
by ropower86
Aug 04 2017 4:14pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

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. Is the casing black or white? The black casing is the newer improved version with better MOSFETs and CPU. Something to look out for. Flier is step...
by ropower86
Aug 02 2017 3:39pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 71077

Re: Electric Hydrofoil/E-Foil

I have some basic mechanical questions: How are you guys handling shock safety? Clearly the electronics need to be protected/waterproofed, but in the event the waterproofing fails and you have accidental contact of battery/live high voltage/amperage wires to the water? How are you sealing the motor...
by ropower86
Aug 02 2017 8:12am
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

Hey Guys, No secrets here anymore. Months I have thought to set up my own company with an electric jet surf, so I could not really share my details. But I'm doing other things lately and the jetsurf is just standing here. So I want to share all details now. I found out the exact details of the Lamp...
by ropower86
Jul 30 2017 5:57pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

Yeah, I gave it up because I live in an apartment now so gas is a big no no. Also, there is a lot of hassle involved with small gas engines Unless you invest in a really good carb. 8) Propane/LP gas? Both the above problems solved. And less polluting emissions. Running on propane will not provide t...
by ropower86
Jul 29 2017 12:30pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 760
Views: 225159

Re: Electric Surf Board

I live in Shenzhen and can contact him his board looks like it has some serious power. @ropower86 I saw your post about using a gasoline engine :D Yeah, I gave it up because I live in an apartment now so gas is a big no no. Also, there is a lot of hassle involved with small gas engines Unless you i...
by ropower86
Jul 26 2017 8:49pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 71077

Re: Electric Hydrofoil/E-Foil

******* ATTENTION ******* This is a warning to all, DO NOT BUY GEARBOX THAT IS MADE IN CHINA! They are made out of low alloy and gears will break under load. That is why their gearbox is cheap and it will not work for our project. +100 same experience. You are not flying on it. But it make you hurt...
by ropower86
Jul 26 2017 8:29pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 71077

Re: Electric Hydrofoil/E-Foil

Hey guys, I found a site where you can calculate your motor efficiency. This is really important because we need numbers.

http://www.bavaria-direct.co.za/constants/

Note: Just scroll down to the bottom of the page. :D