OMG ahaha the price i cant spend that much atm … 
Jap, the is really expensive stuff. Instead of the MGM I would now give the Trampa a try. It is cheaper but has no safety features and automatic connect to the battery and the caps
its better than normal RC batteries ?
Better off with 2 motor set up
For one motor :
Tp motor : tp100
Trampa vesc 75/300
Battery : forget about this type of mount , doesn’t take the power and everything will go a part with the bounces on the water
Rc battery will work but can take fire , Samsung cell 18650 : 30q , 25R will not ( probably other brand as well but not all of them …)
Better put the money on the table first for parts , smart buy but surely not cheap buy …
I would like to build one but I don’t the time or the money now , but I will use the part l listed
to mgm esc: there is also the HBC series. this is the industrial version. here you also have live monitoring with a display of mgm or pc. alternatively with an iisi cockpit v2. mgm provided me with the protocol for my flying sports equipment years ago. so i can read all data there directly from the esc and wirelessly display and save it. Those who are concerned with power surfboard development may have some advantages due to the industrial version. from mgm i know that many people have been working with it for a long time. Sure, it costs a little more, but it is “indestructible” with the HBC 250/63 (that’s the industrial brother of 400/63), 10 kilowatts of continuous output are no problem.
I use also the industrial version. It can be destroyed 
twice times…
My key learnings:
- Use 2 banks of capacitors, cable cross section 35mm2.
- Industrial connectors
- Relays like KiloVac (one for the caps and a big one for the ESC)
Enclosed I send you a screenshot from one of the runs.
Here you can see the data an make some analysis after the run or in real time.
What was the reason for writing that you should also consider the RC ESC?
The actual version of the 400 RC version uses better FETs.
So maybe it is easier to set up and a little more stable.
this picture shows the old layout, on wooden plate and with old connectors.
Also just with one bank of caps.
Wow, is this realy needed for a jet board? 
I knew that they where power hungry but I thought I could do it with a swordfish 300A too or maybe double in a 2 motor configuration.
What do you guys think of this one:
They clame a top speed of 52km/h and a one hour ride time or 30km distance. Sound to good to be true… 
If I were to build a jet board I would go for 2 youngsters jets and then go from there… They work out quite a bit cheaper than anything else.
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Where do you buy those jets? I have seen some video’s they look great
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You need to email mark directly…
u need water jet design ? for 3D print
I don’t have a good 3d printer right now but maybe in the future.
Oki ^^ just pm when u need some design.
Wouldnt it be possible to skip the expensive and power consuming jet principle and go for a ‘prop in a tube’ principle? similar to this:
You can use the SSS 56104 (2 x ±100usd + 2x a large RC race prop )
its a nice idea but im not sure about how this can perform in river ^^
Nice but how do you make the link between motor and prop ? A flexible shaft ?
I think you can use a long shaft and place the props and motor under a slight angle, like longtail boats do. You would only lose a small amount of forward thrust.
With a long shaft, to decrease the shaft angle, motors could be placed in the nose of the board. This would be a bit noisy though.