Electric Surf Board

Boats, Jet Skis, Kayaks etc., including hovercrafts
Just2807
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Re: Electric Surf Board

Post by Just2807 » Wed Feb 08, 2017 7:51 pm

U need certain amount of speed to be foiling and when u reach it, u can foil no problem. Till then, its regular surfboard. And while foiling, u need i would say half the power :)

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Thu Feb 16, 2017 12:22 pm

I mean, hard to get up on based upon the size of the board. You don't have enough size (buoyancy) to float on it prone and then stand when up to speed like you would on a longboard. Looks like you would need to hold onto something while standing and then hit the throttle. Radinn had a board with full boots that must have worked a similar way. Maybe the guy just gets up like you would on a shortboard? That board looks to be around 4' or so. I'll try and do a popup on my wakesurf board this summer and see if its possible for me. Keep hoping to find some more info on this foilboard and the one from Don Montague. Likely the two are the same board though.

willau
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Re: Electric Surf Board

Post by willau » Thu Mar 23, 2017 5:45 am

Hi guys has anyone got an electrical diagram / plan with all the components required to build the propulsion system for an E board?

Cheers

sebkitesurf2
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Re: Electric Surf Board

Post by sebkitesurf2 » Fri Mar 31, 2017 12:36 pm


dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Fri Mar 31, 2017 1:00 pm

That must be the same people who did the other quick video from Puerto Rico. Exciting times! Foils for some reason are still so expensive. Especially Lift. 2500$ for the foil board and then add the cost of electronics and development. Might not be cheap, but looks sweet.

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Re: Electric Surf Board

Post by Jezza » Mon Apr 03, 2017 7:17 am

Hi All

I'm new here but will be embarking on a mission to build an electric foil very shortly. I have ordered a 90cm aluminium mast and once it arrives, i will start with the foils.

Here is a pic of what the motor on the lift efoil looks like: https://www.instagram.com/p/BSPOUrRBGlc ... =liftfoils

As you can see its a ducted prop. This should be relatively easy to get. The big question I have really is what size motor would work?

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Re: Electric Surf Board

Post by msk8 » Tue Apr 04, 2017 12:27 am

@jezza and all - so happy I found this forum. Same here. Been researching electric foils for a while, so hooked on e-everything ever since I built my electric skateboard. I was just looking at the Turnigy AquaStar T20 motors, seems to be plenty powerful with 5000W. Thoughts? Not sure about prop yet. ESC in the bottom close to motor i assume, batteries inside board on top. Guess I will need to drill holes in my foil to run wires to top. Have an old 70cm wide kite race board which I thought about converting, the lift board looks similar. Should we start an efoil DIY thread or is there one somewhere already?

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Re: Electric Surf Board

Post by Jezza » Tue Apr 04, 2017 7:00 am

Qmsk8 - I was looking at the following motor https://www.tfl-hobby.de/Motore--Halter ... ---9D.html. Its a bit mor powerful which means it should run a little cooler than the T20.

Prop - Ducted with a 3 or 4 blade cleaver of about 100mm
Gearing - I'm not too sure if this is needed or not...
ESC - Something that can handle 6s-12s and around 130A (Hobbywing Seaking 130A HV)
Battery - Not too sure what I can get away with here... I'll start by putting 2 or 3 4S in series and see if that provides enough power (I have a bunch from my drones).
Board - I think I might do a DIY wooden board. I want something 6ft or shorter.

The ESC and all electronics will be housed in the board. Its better to have the ESC as close to the power source as possible. It also simplifies the motor section on the foil.

The easiest boards to convert are old windsurf boards. They have a lot of buoyancy and go really cheap on ebay (I might do this, but would prefer a wooden one).
Maybe we should start a new thread as the power requirements will be a little different from an e-surfboard.

msk8
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Re: Electric Surf Board

Post by msk8 » Tue Apr 04, 2017 10:43 am

Great, let's start a new Electric Foil Board thread. Looking forward to discussing and building this. ... Motor looks interesting. Yes good point, ESC on top, extending motor phase wires is better. I just found this about wire lengths: https://www.rcgroups.com/forums/showthr ... orkarounds

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Tue Apr 04, 2017 11:42 am

I got an email from lift yesterday saying get ready to pre-order. Some stats: one hour ride time at 15mph, max speed 25mph, 2.5h recharge time, cost - lets not spoil the fun. Cost is what will be interesting. Are we talking 20k like the Radinn board? That is the issue with a foil board in general, most foils are over 1500 for the foil alone. Lift foils are $2500 complete. E-Foils will have an advantage power wise over a surfboard, but will the cost outweigh the benefits. I was hoping to learn to foil board this summer, with the liquid force foil behind the boat and kiting, so don't know how great it feels. May be worth the additional cost.

I don't think the thread needs to be split as there aren't many DIY e-surfboards. AFAIK there are only one or two builds that are on here. Matthias and Recumpence. The problem is no one has really figured out a motor, ESC combo that works, and the prop or jet size to go with it. A few variables to work out still. I thought it would be an easy project, but I've been trying for a few years now, and still haven't gotten far on it. Too hard to test things out without a lake next door. I have to drive 30 minutes to put it on the water and then find out it doesn't work. Then pack things up go back to the garage, try something else to fix the problem and then head back to the lake. That is time consuming!

Basically from this thread, you need a 7.5k watt setup to power up a board to 20mph or so. Prop version needs 1500 rpm with a Torqeedo prop. 2000rpm with a 100mm jet drive. That is all I know. You get a working setup that I can copy and you'll be my hero!

Pompel79
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Re: Electric Surf Board

Post by Pompel79 » Tue Apr 04, 2017 12:19 pm

Hi
I have plans to create a eletrical surfboards to my 11 years old son. Will a MHz jet 52 provide enough thrust to a boy? I am planning to use a Castle 2028 engine with 6 cells lipo. Will this work? Should be easier to create a board to a kid than an adult.

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Re: Electric Surf Board

Post by bbq870 » Wed Apr 12, 2017 4:16 am

I saw, that Onean started to deliver their boards. that´s an interesting product.
maybe more videos will appear on youtube now.
https://youtu.be/JHh4pk25V5I

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Re: Electric Surf Board

Post by bbq870 » Thu Apr 13, 2017 3:17 am

looks like we have a pricetag for the Lift foils.
12000,-
Bildschirmfoto 2017-04-13 um 12.11.34.png
Bildschirmfoto 2017-04-13 um 12.11.34.png (188.86 KiB) Viewed 1858 times
Bildschirmfoto 2017-04-13 um 15.21.37.png

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Thu Apr 13, 2017 3:39 pm

Thanks for posting that. I signed up for their email list and didn't get anything.

Biggest problem I have with these electric surfboards and the same with complete ebikes is, the parts pricing doesn't add up to any where close to the complete final price. Usually you buy something cheaper than the individual parts. I can build a good ebike for $1500, but if I want a Haibike or Specialized, prices are $5 to $8 thousand. The lift foil boards are expensive at $2500, but are the electronics worth $10k more for the efoil?

From what I can guess, the size of the motor is likely as small as a 6364. The waterproof remote is cool. Battery is likely just a 48v. Where does that $10k come into play? My eskateboard endeavors stemmed from the same issue. I think Boosted skateboards originally wanted $2500 for a board with $500 worth of parts. Amazing 3 years later that now you can find good eskateboards for $500. It will happen with this also, just a matter of time. One of the reasons I would opt for the Onean is they don't seem to be gouging you on the price. I am underwhelmed by the videos I see of it that weren't produced by Onean. Looks way slower than I'd think was fun. Seems somewhat fair for what you get though. I understand the development costs that have to go into a new product, but come on!

I'll wait to see what Dan Montague has to offer with his efoilboard.

bbq870
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Re: Electric Surf Board

Post by bbq870 » Thu Apr 13, 2017 9:24 pm

the "problem" with the price is, you need MOULDS for every part you see on that picture. these moulds are CNCd from steel (sometimes Aluminum) and they cost thousands of dollars.
that means, they need to add the mould cost on their product too.
also they have to ship things from China, pay tax and other cost.
so in the end, when they put their margin on the price (their income) you get a >10.000$ product.

I don't think the Lift is too expensive. But most people do think it is.
that's why we will see a price drop pretty soon, when people don't order the lift.
They produced hundreds of them and need to sell.

edit:
" good eskateboards for $500"
the Landwheel is crap. breaks after minutes of use. in the 500$ range they are toys.
it´s more $1000 what you need to invest for a good E-skateboard



the Lift:
and yes, if you take away $2500 for the foilboard, it´s hard to justify 10000$ for motor and battery.

Andre9011
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Re: Electric Surf Board

Post by Andre9011 » Sat Apr 22, 2017 2:45 pm


msk8
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Re: Electric Surf Board

Post by msk8 » Sun Apr 23, 2017 10:25 am

Totally awesome carbon work Virus does there. Hope it will have the power to lift off, looking forward to his next test. I thought about jet inside the fuselage too but decided to go with ducted prop for my first build, ESC and batteries inside board.

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Re: Electric Surf Board

Post by mr.electric » Tue Apr 25, 2017 1:26 am

agreed great carbon work
-Fat Sand Bike with 9c and 29ah pack

-Giants mascot scooter

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Bazaki
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Re: Electric Surf Board

Post by Bazaki » Wed Apr 26, 2017 10:47 am

Wow ! Virus youtube channel is very nice. But a lot of extra batteries inside the board would be nice too. Hopefully the next test will lift it off the water

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Wed Apr 26, 2017 11:20 am



Mine as well post this here. Hope to see him foiling next time too.

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Wed Apr 26, 2017 11:29 am

Here's an even better video:


Curious on how they put this together with development. ES forum members? Also wonder what Damian Leroy had to do with it. The guys a serious kiter. Like the other product with Dan Montague involved.
The debate whether to go old school with Onean boards or the more efficient foil? The lift board looks like it would pack down and be travel ready. Still $10K? I'm heading to Puerto Rico!
Also they show how they are getting up, board looks bigger than I had thought.

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Re: Electric Surf Board

Post by Jezza » Fri Apr 28, 2017 4:21 am

Looking at eFr3ak numbers from when he submitted his component list:

Performance:
Max Power: 9.8 kW (205 A @ 46.7 V)
Max Speed: ca. 44 km/h (probably higher as max throttle was never applied for a longer time than 2s)
Max RPM (prop) : 6800 rpm
Planning speed: ca. 20-25 km/h
Power @ planning speed: ca. 3.2 kW

One can get a rough idea of what may work. For an efficient foil, you can generate lift at around 4-8mph depending on rider weight.
With the same components you could then guesstimate that to generate lift you need around 1.6kW of power.

The most frustrating part of this build is picking the correct gearbox!! They are insanely expensive and not very easy to find within the required specs.

Through my browsing and research I have come some other solutions with less powerful motors (more for just cruising):

The scubajet: https://shop.scubajet.com/
Vorta power system: http://www.vortapowersystems.com/Vorta- ... motor.html
Electrafin: https://www.currentdrives.com/products/electrafin
Epropulsion Lagoon: http://www.epropulsion.com/lagoon

msk8
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Re: Electric Surf Board

Post by msk8 » Sun Apr 30, 2017 3:04 pm

Hi fellow efoil builders, here an update on my design thoughts and prototyping progress. Here a list of the components I will be using: https://www.dropbox.com/s/d31ti8819uahm ... .xlsx?dl=0. Looking forward to hearing your thoughts:

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Re: Electric Surf Board

Post by Jezza » Tue May 02, 2017 2:22 am

msk8 wrote:Hi fellow efoil builders, here an update on my design thoughts and prototyping progress. Here a list of the components I will be using: https://www.dropbox.com/s/d31ti8819uahm ... .xlsx?dl=0. Looking forward to hearing your thoughts:
Hi msk8

I like the design, its looking good! I think you could have used a smaller motor (would have also made it a bit lighter). I think you are going to need a gearbox, this will give you more torque and allow you to use a larger prop thus making it more efficient.
It will be very interesting to see how the 3D printed parts hold up as I plan on printing most of my casing as well!

dirkdiggler
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Re: Electric Surf Board

Post by dirkdiggler » Wed May 10, 2017 3:21 pm

Wow, it's been almost 5 years for this thread and I've only seen a few working projects.

I got to ride the Jetsurf last weekend and I'm excited about finally trying to get something going. I did realize the limitations of the board. In even minor wind chop the board wasn't much fun. Super hard to keep the board stable. In flat water it was a blast though. I see the advantages of the foil. Also the jetsurf has a really flat bottom, but with width and any bumps are felt. Also the guy I rented it from had some mechanical issues with a board's engine. Not something I want to be doing. I don't have the knowledge to be working on a high performance two stroke engine.

Saw this on youtube today:

Not too impressive on the water, but looks like a working concept. The motor looks like a 6364 size, could be bigger.
They have a few pictures on a website, don't speak or read Spanish so don't know if there are any other details to be found.
https://www.behance.net/gallery/4356227 ... -SURFBOARD

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