Boards for eFoil


#1

I was talking to pacificmeister about his project, and I still have a few of the same boards that he is using on his project.

https://goo.gl/gxP3nB

Mention efoil builders for additional $150 discount.


Pacificmeister Build Info and CAD Sources
#2

What is the thickness of this board. I’m concerned that it may be a bit thin to make a cavity to house the batteries and electronics completely consealed inside the board.


#3

It’s pretty thick and my stuff did fit. Here an image that shows the thickness while cutting one of the cavities:


#4

Wow, great job. That does look thick. Knowing it was kite board I would have thought it was thin. My apologies for doubts.


#5

Does anyone have rough dimensions like length, width, height and volume of a board?

Also, does anyone know how the force of the mast connection is distributed within the board? Do they have long pipes build into the board? I have a bunch of carbon fibre golf clubs lying around. I plan to incase them on the inside of my board for strength. They are conic and pretty useless otherwise.


#6

The bigger of the two lift boards is 1680mm (5’6") x 710mm (28"). Not sure how thick it is though. I have designed a board that is similar in dimensions but a different shape, without the rails shaped it will be about 104L volume. I have some PDF templates that I have made that you can print on A4 and stick together if you would like them. The design hasn’t been tested though, going to start shaping from a block of EPS this weekend. I was going to put some extra 6oz glass at the back of the board on the top and bottom where the foil connects for strength. Cheers


#7

Thanks, but I will CNC my board from Foam.


#8

If you are willing to share your templates I would like to view the shape. My current plan for testing is a 30+ years old windsurfboard which weighs more than an oil tanker. Would be nice to make a better board.


#9

Sure. There is an overall template and then I have split it into side profile and plan for printing. Just print it from Adobe acrobat as a poster in A4 at 100% scale and it should come out to the correct dimensions. It won’t let me upload a PDF. I can email them to you if you like?


#10

Me too as I am about to shape mine in CAD


#11

I’m currently shaping @Goldy 's files in CAD. If he agrees I can share it with you or here.
I’m just to inexperienced to trust myself with shaping in real life from just to templates :slight_smile:
It’s actually not really easy in CAD, too.


#12

I am making a parametric model where I start with a box and cut away angles and curves to get a round shape that can be glassed. Will share the file here.

I am wondering about the electronic compartments though. Ill keep ESC and batteries separate. Does the ESC need to be water cooled? Or can I keep it inside a box?
If water cooling is necessary, do you need water flow, or could it be enough to submerge it from time to time?


#13

There is some debate about how much cooling is necessary : http://efoil.builders/t/cooling-the-esc
I would plan on at least some cooling. I won’t build my board until I’m convinced that my cooling setup works.


#14

We are able to ride a full charge on 2x10000mah6s lipos (about 15-20 minutes) with no watercooling on the ESC, only an alu heatsink. ESC=Seaking 130 A, we are riding in a cold environment tho… might be different in the summer. But I think and hope that it will be possible to not use watercooling, as that will make the system less prone for failure (blocks in the cooling pipes for example).


#15

That sounds very good. I will add an Arduino temperature monitor. Just some red and green leds, or a warning sound.


#16

Sure thing, share away. I would upload them to the forum but it wouldn’t let me upload in PDF. I also have a 3d model in fusion 360 if that is any use to you.


#17

Use a free upload service. Fusion 360 would be great too.


#18

Hi Max. Sorry for the late reply, been really busy this week. Here are the templates and Fusion 360 file if you still want them. The 3D model is very basic, as I am shaping from the templates I only made it in 3D to roughly work out the volume. I didn’t bother adding rails etc as I am shaping them by hand. https://drive.google.com/drive/folders/19gStRSl3ukZRxmQszO8yvxmWV9vgSZoP?usp=sharing
Started making some progress.


#19

That looks really nice. Will you float on it? Is your deck curved or flat? I think that curved might be stronger.


#20

Thanks. Will still probably have to start lying down and then stand up when I get some speed up, I am close to 90kg but someone lighter may be able to start standing on it. The deck is curved (about 30mm), would have liked it to be more curved but I was limited by the thickness of the polystyrene sheets. Cheers