99cm (Volker‘s fourth)

[V_S]

How much eFoil do you need?

I tried.

Goal: 10kg, so my son can carry it by himself.
Some specs:

99cm * 48cm * 6cm
12s4p VTC6 (optional 12s4p 21700 50s fit in as well)
Vesc six

Similar build like shorty 2, but without wooden box. Full Carbon. The finished board was 2kg. Additional Coating, Stupid round screwcap weights 400g + glue and screws. 400g Vesc (including cooling & metr and receiver). EVA pad 170g; 2400g battery i am at round about 5,5kg.

My old RL setup with 63100 is 5850g.
Final weight total 11,35kg.
Next step: Building weight optimized carbon mast with 6384 and carbon fuselage. That should save at least 1,35kg.

My kids only need 8A batterycurrent flying, 15-20A starting. So the setup is fine for at least 1h, even with plenty starts.

Maiden flight was today (me).
What can i say?
I dont need more than 99cm

Cutting templates shorty 2 (118cm) VS 99cm

Side by side

perspective is savage

proof even adults can ride it:

Current limit motor 99A (and aditional limits like erpm, current batt, Power, SPACE for riding🤪)

Submarine start

99cm board, 99A motorcurrent start

[Jezza]

Good to see someone starting sensibly and not trying to stand up too early! It makes a world of difference when you start with the right amount of speed.
I love this build!

[hovav]

I love this build. VERY NICE !!!

[V_S]

Rider weight 80kg, 4p VTC6. Old 63100 with screaming ballbearings, but works.
Good for 10km range.

[Larsb]

Have you noticed any problems with touchdowns and the sharpish square shape of the front of your boards? I would assume the sharper corners might cut down and get stuck in the water?

[V_S]

No issues with touchdowns. The nose is tilted up more than enough.

[Larsb]

Yes, but sometimes i drop down during turns and touch the water, especially in higher waves. I’m concerned that a square low volume front corner like that gets caught in the water, causing a crash. How is that working for this board shape?

[V_S]

My 63100 reached end of life. RIP

I‘ll test the 5085

Any suggestions for a good prop? That one looks so flimsy.

[rttn]

I would advise you to use a scaled Volker propeller )))

[V_S]

I’m afraid that’s what it will come down to.

[sharrow]

@V_S isn’t it forbidden in all lakes from austria to go with an EFoil? If it is allowed, do you know where else in Austria or where I can find the rulse for it. Because I saw a 10km ride from you on the Wallersee here. Thanks

[V_S]

Sorry, wrong Adress, i am from Germany.
Once lived in Bavaria, almost everywhere forbidden, now i live more Central in Germany, and all Rivers are free for me

[sharrow]

Ok though you knew something I do not know. It’s a pity, in switzerland also forbidden and germany mainly the rivers only.

[V_S]

@V_S

I‘ll test the 5085

Works flawless
800-850W at 21-22km/h.

(ignore speed and consumption. Based on calculated Speed, but wrong settings for Transmission in Vesc)

[Alex2A]

Very nice
It might provide a Usefull alternative, for a surf oriented efoil it probably is less dragy

[V_S]

Definitivly less drag. Motor performs really well, is sealed and potted properly. But the bearings are Low Performer. 8h, No salt and ready for the dumpster.

Back one for replacement: SS608 2RS
Front (two piece) SS688 2RS

[Alex2A]

Once we find a folding prop for this motor it could be a very good choice for a low drag efoil

[V_S]

5085 works like a charme. Even though its on pinky atm.
Only downside: Outrunners are always Kinds noisy

1. August 2026

[Alex2A]

very nice.
it surely is a balancing act when starting with such a small board.

I am thinking about starting a project like yours, but can you show some details about the conection, and waterproofing off the mast/ bottom of the board please ? I am not to sure about how to proceed for this part.

[V_S]

Board: a small oval hole
Mast:
The red stuff is 2mm foam rubber

In terms of how to start, here a small peakview