The Audi e-tron e-foil



  • 3D printed aluminium for all aluminium parts (watejet, nozzle, stator, …)
  • power: we don’t really know (2 to 6kw)
  • Max speed: 43 kph
  • delivery: mid 2020
  • price around 10.000 USD

First tests in Kiel : June 2018
First presentation to public: January 2019 in Las Vegas, Nevada during the CES 2019

The full story:



Beautiful design and impressive enough specs with surprisingly low price for Audi. It’s the first commercial e-foil that I instantly feel I want to buy.

Don’t get too excited. Audi designed an (admittedly beautiful) electric skateboard but it never saw the light of day

Is Franz Hofmann, the builder, a member of this group?

I bet he is lurking the threads :wink:

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That is a tiny tail volume. I can’t imagine that thing being statically stable.

Design looks great, but since I e-foiled successfully too now…I know that this concept has some serious faults… And this impeller setup is just a wasting energy thruster… Look at the big cooling plate below the board, then you know that they will pull 100A+ . And if the don`t use the battery from the e-tron then I assume riding time is less than 10minutes :sweat_smile:

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The mast seems angled backward, so even if the tail looks visually smaller, it might be not so bad :slight_smile:

So true :yum: Mono body/fuselage Concept by @x-jets

Airplanes have a tail for a reason. That thing probably has a small static stability derivative and probably requires a bunch of control input to keep it from flying away.

You can see the effect of tail volume in the section on static stability here.

I bet that Xjets foil doesn’t even work.

There’s also Flying Wings (,
but you need a special foil section for it to allow to be “flyable” or statically stable.
Since with aircrafts you set your CG once and control the plane via control surfaces, it’s hard to compare to the weight shifted control we do on our foils.
I personally don’t think a Flying Wing would be a good setup for a foil unless you have control surfaces (ailerons) and a processor/controller that helps you keep the foil level (which would be kind of an autopilot, or controller like they’re used in drones)

As for the Audi Foil, I’m not really convinced of the setup. The backward bend mast is just a design thing I suppose, and the tiny tail looks really small.
I’ve seen that thing in Kiel last year, I was there when they did a promotion run during “Kieler Woche”. Not sure how long they’ve been in the water, but it didn’t look to “smooth” and only starts foiling at quite high speeds I believe (i don’t have any data, just from seeing it)

Apparently will be brought to market by this company with some possible cross-branding with Audi e-tron:

Pre-order is live. $15k USD with production starting in August 2021:

Pros: safety (first commercial impeller), direct drive [looking forward to knowing the motor details (Kv, manufacturer, slot/pole number)], remote control, battery quality up to Audi electric vehicle standards, tbc’d…

Cons: price (15,000€ including taxes + shipping for EU residents), is 32kg really “lightweight” ? No information about ESC, tbc’d…

Questions: how much energy (autonomy) is lost in this impeller compared to a propeller system ? What happened since the 2018 prototype, the hull cooling system seems abandoned.

Audi e-foil 4x
High AR wing

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I’m not sure that a company like Audi would implement a standard water jet knowing it’s inefficiencies. Maybe they’re using something like this.

It is not Audi, it comes from Aerofoils Gmbh not Audi, they just use the Etron name for marketing purpose. I think in agreement with Audi


I don’t think you really know enough to comment :thinking:

If you say so… :sweat_smile: and you know more about it…tell us :innocent:

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