Tobi's build from Berlin V3 & V4

Hey guys, finally i can share some pictures of finished V3 & V4 boards. :call_me_hand:

The V3 board is a copy of V1, made from a Anton Wingboard of the same dimensions 147x65cm 70 Liter. Initial weight was 5,6kg.

Lid is made again from sealed multiplex plate combined with 1mm CF sheet.
Motor is a 65161 with flite inspired custom made mast and fuselage which i inherited from @Subusi. Thanks for the amazing job!
Here is a link to the moulds:

I’m also again using a MGM 14063-3 ESC which was working already flawlessly in V1 & V2.
The process of the build is identical to V1, hence if you’re interested check out my first build thread:

And here V1 & V2 & V3 together:

And finally to V4 which i just finished recently:
The base is a Gong Kube 3’11 (119cm) board with 90cm Gong mast and FR Motor.

These are the dimensions:

The board was a perfect fit for transforming it into an efoil! Gong has done a good job, i was impressed with the build quality of the board when i opened it.

The cavity was made a little smaller than on the other boards, just big enough so i would be able to use my batteries. One difference though, since i needed to put the mast as far backward as possible, i had to flip the direction of the electronic box.
Because this board was thick enough i didn’t have to mill until the bottom laminate and was able to use the track box and leave the FCS handle.
To support the track box i laminated a sandwich of 2 CF sheets of 1mm each over the bottom of the board.

Lid is made again from sealed multiplex plate combined with 1mm CF sheet.
And also in this board i’m using the MGM ESC.

Here a size comparison V3 & V4:

9 Likes

Hi, great build!

Wich Amphenol Connector are you using?

4 Likes

Thanks Robert!

The plugs are 5,7mm Amphenol ones, they fit perfectly on the thick FR cables:

The code for the black ones is SLPIPA16BSB, red ones are SLPIPA16BSR for example.

1 Like

Thanxs for your answer.
So, i was right what i thing.
Did you know that this Connectors have only a rating for 100A?
When i start my efoil, i had around 170A for 10-20 seconds.
I check some metr logs and see also when i am around 40 km/h, i am between 88A and 110 A.
I always want to be on the save side… :-/

Yes I knew, although they’re sometimes saying that they can handle 120A:

I’m sure that short time they can handle 180A.
At least I’m also pulling 180A while starting and they are lasting!

Although I have to say, after I let a 120kg guy use my foil and he had one failed start after the other, also the 5,7mm Amphenol plugs started melting. They were still working but I exchanged them for safety reasons.

If you want to be on the safe side you could use the 8mm ones. But I found them way to big and chunky.
Here I made a comparison between 5,7mm and 8mm ones:

2 Likes

:rofl:
Oh mann, thats why i not let ride all peoples with my efoil.
Special peoples above 100 kg

1 Like

What!? Pick on someone your own size, won’t you, I am kind enough to let a hundred kilo guy use my board every time! :laughing:

We 0.1 tonners bring stability to the team :star:

4 Likes

I’ve decided to unleash the beast MGM 25063-3 with 250A continuous and max peak current of 360A!

Unfortunately the short Gong board is hungry for energy at starting, and since ram pressure is relatively low at start, the old MGM 14063-3 didn’t get enough cooling and has been overheating quickly.

I was drawing 170A at start with controller temperature at 110°C and was facing thermal shutdown of controller.
The bigger 250A ESC should handle high currents much better, so no more thermal shutdown.
But i’m wondering how many amps the FR motor can handle. I was thinking to limit current so the motor won’t burn.

Any ideas of what FR is capable?

1 Like

See here: VESC setting for FR motor - #84 by Manufoil
Max motor current in the log: 290A.

1 Like

Nice work, the AIREX cover would have been lighter than the wood! Can you tell me what the seal of the trap door is made of ? MOLD30 ? How did you go about casting the gasket?

1 Like

You’re completely right. That’s another project, i want to change all covers for airex covers. The wood and CF sandwich isn’t too heavy though.

The seal of the trap door is made of 2k silicone, here is a link:

I’ve applied @michion method of a temporary window seal as a barrier and then poured the silicone in place and closed the lid. I’ve done the same for the mast plate seal.
This worked out for me perfectly, not even a drop of water in the cavity!

2 Likes

Can’t wait to take this baby to the sea!!

For now only fliteboard ultra with fliteschool mallorca… :call_me_hand:

https://www.instagram.com/reel/CgOqo19KeN2/?utm_source=ig_web_copy_link

1 Like