UK Efoil build V2

So, I’m thinking about my V2 Efoil already, component’s will get built slowly over the year and assembled next winter. V1 works great so no urgency.

Bits I have bought so far

  • APD 200F3 ESC
  • Gong v2 mast 85cm and top plate

If my 65161 is still OK after this season it will get transferred to the new build.

I’m thinking of doing a passive cooling build again but mounting the ESC in a cast aluminium box under the board.


The APD f3 200a is fantastic. Tested one today and its so simple and runs the motor faster than a vesc.

Good news, thanks for the heads up.

Did you setup the ESC manually or leave it as auto detect?

Left it as auto. Its slightly noisier than my arc200 and vesc, but runs faster and is just way easier.

Hello, for my second project, I am looking for some similar solution - passive cooling and ESC located on the mast.
My question: do you have a drawing of the Gong plate and could you send it to me?
The regulator I have is a Makerx - much larger than yours.
I like your approach and my second question is, would you share your development in a file that can be modified?

Hi, yes sure I can share the mast plate. I’m a bit limited in file format with the design program I use.


Hello, if your software allows export to a STEP file, it would be the optimal option.
If not possible, STL can also work. I can also modify it with Fusion, but much more complicated.

Very nice job, the first bow attempt. Are you thinking of doing foundry work ?

Yes :slightly_smiling_face: I built an electric foundry a while a go which worked pretty well, I tried the lost pla method of casting and some perfect casts. This time I will use proper investment plaster instead of playing sand and plaster of paris.

Looking forward to seeing the project evolve. Could you document your foundry steps ?
How will you prevent water ingress ? An O-ring seal ?

On a side note, I didn’t realise that this APD 200F3 ESC packing so much power was only 34mm wide and 12mm thick … leaving so much free space inside the 90x165 mast plate screw pattern … Will you use this space only for connectors ? A receiver (@ludwig_bre’s ?) could nearly stay there with an external antenna like the Lacroix Vortex…

How will you ensure the thermal contact between the ESC and the cast aluminium box ? Paste, liquid, nothing ?

I will definitely show the foundry steps.

Design evolving slightly, the esc moved to the side to allow easier cable routing and no need to cast the bow shape, the black beak/bow will be 3d printed and glued on, this saves weight and makes casting easier.

Still plenty of space inside the box for reciever but the antenna will need a long extension to front of the board.

The box is only 24mm thick BTW :slight_smile:


Sorry I missed the other questions.

For sealing I was just going to use a PU sealant on the joint, if everything works OK then I’d expect not to go back in but it would be possible.

For thermal contact I would use paste but I would need to machine the casting smooth just under the FETS and perfectly machine the top heat sink stand offs either side so the height is just right when clamped down.