Electric Hydrofoil/E-Foil

Boats, Jet Skis, Kayaks etc., including hovercrafts
beonwater   1 mW

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Re: Electric Hydrofoil/E-Foil

Post by beonwater » Aug 15 2017 6:46am

Hiorth wrote:So we have the board up and running, and it works nicely. Will post a detailed instruction with all cad files, part lists etc on Instructables.com this week, if anybody want some inspiration or propeller design that works you should check it out. Will post a link here, once it is up.

We will start on our V2 soon.

Action points:
- Smooth aluminum thruster casing, that can be fully disassembled
- Big Battery pack! probably 2x 48v 530 Wh + battery box for the board
- New ESC with more cooling, aluminium heatsink probably
- Arduino based bluetooth hand controller with launch control and built in battery display + safety features
- Accelerometer and other type of sensors to give feedback to the Arduino to ease operation (and for servo stabilizer)
- Safety features--> controller in water should deactivate the throttle and stop the propeller, Leash that cuts the power if released and proximity "leash" that cuts power when controller is out of range (3-5m).
-Build Foil from scratch, will add more lift to the foil wing than the Nobile wing and make it A lot lighter!!.
- Build a better and lighter Board from scratch

For fun
-Try to build co-axial propellers
- Try to build servo rodder that stabilizer the foil like a "segway", so its super easy to ride for anyone
For the microcontroller I would suggest the ESP32 as it has built in bluetooth and wifi. You could still use your Arduino IDE software to program it.

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 15 2017 6:49am

beonwater wrote:
Hiorth wrote:So we have the board up and running, and it works nicely. Will post a detailed instruction with all cad files, part lists etc on Instructables.com this week, if anybody want some inspiration or propeller design that works you should check it out. Will post a link here, once it is up.

We will start on our V2 soon.

Action points:
- Smooth aluminum thruster casing, that can be fully disassembled
- Big Battery pack! probably 2x 48v 530 Wh + battery box for the board
- New ESC with more cooling, aluminium heatsink probably
- Arduino based bluetooth hand controller with launch control and built in battery display + safety features
- Accelerometer and other type of sensors to give feedback to the Arduino to ease operation (and for servo stabilizer)
- Safety features--> controller in water should deactivate the throttle and stop the propeller, Leash that cuts the power if released and proximity "leash" that cuts power when controller is out of range (3-5m).
-Build Foil from scratch, will add more lift to the foil wing than the Nobile wing and make it A lot lighter!!.
- Build a better and lighter Board from scratch

For fun
-Try to build co-axial propellers
- Try to build servo rodder that stabilizer the foil like a "segway", so its super easy to ride for anyone
For the microcontroller I would suggest the ESP32 as it has built in bluetooth and wifi. You could still use your Arduino IDE software to program it.
Thanks, I will check that out. Seems logical to use a micro controller with that built in!!

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 15 2017 9:07am

Clarin wrote:Congrats for your maiden flight!
Could you share the video outside of Facebook, please. I am dying to see them
https://www.facebook.com/hans.hiorth/vi ... 775687465/
https://www.facebook.com/hans.hiorth/vi ... 714005923/
https://www.facebook.com/nikolai.hiorth ... 357435144/

These links should work.

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 15 2017 10:12am

There is one issue that needs to be solved with these boards. Jets are to ineffective but safe, props are effective but they are dangerous. The propeller will cut of your fingers and toes if they are placed inside the duct! Do you guys have any thought on this matter? Could of course add a net in front and back of the duct, but I think this will increase drag if you want shield it sufficiently.

I think I read that the lift foil controller cuts power when in contact with water, and if it´s far enough away from the board. which is good, but I dont think it covers a rather normal situation that we experienced when testing.

If you hold the controller above water, when you are in the water next to the board, your toes are really close to the propeller (your other hand may also be very close to the propeller).

My Idea is to incorporate a pressure sensor or something similar inside the board or in the traction pad, that can feel if there is a person on it or not (certain amount of force required to activate the full speed of the prop). The prop will turn slowly to allow some movement movement when there is nobody on top, so that you can drive it back to yourself.

Clarin   10 µW

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Re: Electric Hydrofoil/E-Foil

Post by Clarin » Aug 15 2017 10:27am

Thanks for the links it worked, and CONGRATS

How about a pressure mat under the surf mat (or Straps), so it cuts the power has soon as there is no weight on the board: http://www.arun-electronics.co.uk/pressure_mat.htm

FROGMANGEEK   1 mW

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Re: Electric Hydrofoil/E-Foil

Post by FROGMANGEEK » Aug 15 2017 4:37pm

A magnetic emergency relay switch could stop the main power source in case the rider fall. A magnet leashed to the rider could do the job.

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Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 15 2017 5:08pm

Clarin wrote:Thanks for the links it worked, and CONGRATS

How about a pressure mat under the surf mat (or Straps), so it cuts the power has soon as there is no weight on the board: http://www.arun-electronics.co.uk/pressure_mat.htm
Thanks :=)

Just sent them an email asking if their systems are watertight and so on. The downside is that its a on/off switch, not a sensor.

Talked to a electric guy, he had this funny idea to use a bicycle tube with some air inside and add a pressure sensor inside the tube. Then place the tube in a pattern below board deck. A person standing on the deck will increase the pressure inside the tube and activate the prop. This way you can sense if there are somebody on the board or just hands on the board (when you are getting on the board).

Will use som time to figure this one out.

Would work with a Leash, but I think its a nicer to not have a leash.

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parabellum   10 MW

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Re: Electric Hydrofoil/E-Foil

Post by parabellum » Aug 15 2017 8:12pm

Hiorth wrote:This way you can sense if there are somebody on the board or just hands on the board (when you are getting on the board).
Is it probably enough to zero the throttle if you want to get up and use the pad to switch off if less them 15kg is on the pad? It is good to use as much of your own brain until machines take over IMHO. :)

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parabellum   10 MW

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Re: Electric Hydrofoil/E-Foil

Post by parabellum » Aug 15 2017 8:49pm

And yes, I got my trolling motor, advertised 86lbs trust and 1164W, it is huge and weights ~ 10kg by itself, it delivers only ~800W at 24V in real life, hauling 700lbs (all in) inflatable boat. I recognize there are some better candidates, like DD brush-less trolling motors, expensive though. Will order a controller to get it up to 3KW, hopefully. :)
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staska   10 mW

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Re: Electric Hydrofoil/E-Foil

Post by staska » Aug 16 2017 6:04am

If any one is thinking of angled gearbox, got some info from supplier - 10 gbp for set of bevel gears, 12/22 teeth and M1.5 module

+ you will need main 62020 bearing and 6001 on small end for main shaft, and two 627 on vertical shaft. + aluminium foundry and some machining. It will be happy with 2kW ++ continuous power.

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Bazaki   10 kW

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Re: Electric Hydrofoil/E-Foil

Post by Bazaki » Aug 16 2017 6:32am

About the trolling motor. If you replace the prop with a higher pitch prop you increase the watt also. So maybe you can reach 2000watt. You only need this higher power for just a few seconds?

kiter_UK   10 mW

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Re: Electric Hydrofoil/E-Foil

Post by kiter_UK » Aug 16 2017 8:30am

Has anyone considered a paddle to assist as per SUP foil?

Reckon you can get the first 5mph by paddling . Cf assisted e bikes.

Not as elegant but every W helps at lift off. Allows the set up to be optimised for higher speeds.

I'm intrigued by the contra coaxial "for fun" idea.

As well as canard foil set up I am looking into folding propellers. These look to really help with the low speed torque vs high speed drag trade off here. (Super expensive and not sized for this problem.)

Although I not that one of existing demos used aircraft style prop.

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parabellum   10 MW

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Re: Electric Hydrofoil/E-Foil

Post by parabellum » Aug 16 2017 8:57am

Bazaki wrote:About the trolling motor. If you replace the prop with a higher pitch prop you increase the watt also.
Yes, I found 12" prop that will grab more water and raise current but I need variable speed controller in any way and a 3D printer as it looks to not depend on OTS props and parts.

s9tim   10 µW

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Re: Electric Hydrofoil/E-Foil

Post by s9tim » Aug 16 2017 8:53pm

Success on first water test today. Was using 12s. I will post details on my setup tomorrow.

https://www.instagram.com/p/BX4GjLKA_Nv/

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The fingers   100 GW

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Re: Electric Hydrofoil/E-Foil

Post by The fingers » Aug 16 2017 10:30pm

8) Laird Hamilton would be impressed.
Black Schwinn High Sierra
Blue Schwinn Cruiser 5
Blue Schwinn High Plains
Black Fiore Cruzer 5: Amped Warp Drive 26" Front DD/SLA kit
http://ghostbikes.org/
http://www.rideofsilence.org/main.php
Hebrews 9:27

Gege2000   10 mW

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Re: Electric Hydrofoil/E-Foil

Post by Gege2000 » Aug 17 2017 12:04am

s9tim wrote:Success on first water test today. Was using 12s. I will post details on my setup tomorrow.

https://www.instagram.com/p/BX4GjLKA_Nv/
Wow! Awesome!

FROGMANGEEK   1 mW

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Re: Electric Hydrofoil/E-Foil

Post by FROGMANGEEK » Aug 17 2017 1:08am

Good job eager to know your set up !

Envoyé de mon F5321 en utilisant Tapatalk

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 17 2017 1:53am

s9tim wrote:Success on first water test today. Was using 12s. I will post details on my setup tomorrow.

https://www.instagram.com/p/BX4GjLKA_Nv/
Nice!!! Like a Pro!

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 17 2017 3:54am

I angled the rear wing of the foil, and the foil mast to make the foile fusalage more parallel to the board, It made huuge difference in riding experience! much easier now :)

Also did a thrust test, with no rider:
https://www.facebook.com/nikolai.hiorth ... 344945144/
Its amazing how much power you get out of these small motors/propellers!

Jezza   10 W

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Re: Electric Hydrofoil/E-Foil

Post by Jezza » Aug 17 2017 5:24am

s9tim wrote:Success on first water test today. Was using 12s. I will post details on my setup tomorrow.

https://www.instagram.com/p/BX4GjLKA_Nv/
Ride that thing!!!! Looks fantastic!

Jezza   10 W

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Re: Electric Hydrofoil/E-Foil

Post by Jezza » Aug 17 2017 5:25am

Hiorth wrote:I angled the rear wing of the foil, and the foil mast to make the foile fusalage more parallel to the board, It made huuge difference in riding experience! much easier now :)
I did say that it would ;)

Hiorth   1 W

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Re: Electric Hydrofoil/E-Foil

Post by Hiorth » Aug 17 2017 5:36am

Jezza wrote:
Hiorth wrote:I angled the rear wing of the foil, and the foil mast to make the foile fusalage more parallel to the board, It made huuge difference in riding experience! much easier now :)
I did say that it would ;)
I know, thanks Jezza:) will try to play around with the angles.

beonwater   1 mW

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Re: Electric Hydrofoil/E-Foil

Post by beonwater » Aug 17 2017 5:42am

Hiorth wrote:I angled the rear wing of the foil, and the foil mast to make the foile fusalage more parallel to the board, It made huuge difference in riding experience! much easier now :)

Also did a thrust test, with no rider:
https://www.facebook.com/nikolai.hiorth ... 344945144/
Its amazing how much power you get out of these small motors/propellers!
It seems logical as you have the thrust so far down. And depending on the boardsize and distribution of the volume you may need to be to far back when start riding and when the foil lifts you you need to be further forward to keep it down.

Have you measured how much current you use when starting and foiling?
I you got my "MYLB-FT08 RC 150A High Precision Watt Meter and Power Analyzer" that I´m thinking of using to see peak current and power. But further on I´m thinking of logging current, voltage, speed (GPS-module or syncing with a smartphone) using an ESP32. I think these figures would be valuable for optimizing prop and wings.

Have you published your 3d models yet?

kiter_UK   10 mW

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Re: Electric Hydrofoil/E-Foil

Post by kiter_UK » Aug 17 2017 6:57am

Glad to hear board angle helps with ride, presumably mostly during take off? How did you find it once the speed at levelled? Did you find the nose down?

(I still think having a positive lift for both wings (rather than typical positive negative or positive neutral set up) and a bigger rear wing than typical is perhaps a better answer than adjusting the angle of board to mast as I reckon this will create more lift early for less drag at higher speeds.... admittedly lots more work to figure out than and angled mast)

s9tim   10 µW

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Re: Electric Hydrofoil/E-Foil

Post by s9tim » Aug 17 2017 7:36am

Here is my setup, similar to the other ones that have been successful. Thanks to all of the previous designers for the information to make a successful efoil!

Custom diy foil, wood core with carbon fiber lamination, foil lifts at 4 mph

Parker PV17FE-010, 10:1 gear ratio

SSS 56104 500KV 6 pole brushless motor

HobbyWing SeaKing V3 130A controller

2x 6s 12000mah batteries running in series

Using a 5 inch diameter PLA printed prop, 4 blade.


I fried my volt/amp meter during the build process so I do not know the amp draw while riding (new one on the way). Rode for 10 to 15 minutes and each battery took 4500mah to fully charge.
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