The slot is 44.6mm x 8.6mm from side to side. I have a mitutoyo so I know it is correct 
I rounded it to the nearest 1/10 ofcourse.
That is a nice speed! What motor, prop and wing do you use? I will test again soon with my new Cabrinha high rise speed wing. I hope it will make a difference with my liquid force thruster. Size is almost the same but the Cabrinha has a different faster looking profile.
Folding prop no duct right?
Yes. Sorry forgot to mention that. It’s been added to the YouTube description. Thx.
A good calliper starts as low as 10usd (Home Depot, LIDL, …) or bring both your Spotz and LF masts to a place where there is one.
Only you have access to the Spotz mast bottom dimensions.
Here is @MauiMan Liquid Force unknown mast search.
How did this mod work out? I may need to do something similar.
Did anyone break the speed record? Also i hit 38kmh( nothing special) at 30% throttle at 2000w. Gong m. Me 50kg. I can start with 1000w and fly with 600w.
I’hit 40kmh regularly and prefer foiling around 35 in calm waters. Today limited by 14s, 100kv and 6” pitch prop.
Will try 16s with medium Gong Veloce next week, but still need the missing FR 7” prop for 50kmh capability… Damn, why did I go 100kv on all 3 masts…
Also where does this become dangerous? I’ve never hurt myself sofar, bit keep hearing about potential eardrum breakage at some falling point.
Jelous of you Felix. Not only do I have to use Maytech remotes, I also have to push 100kg of flesh and 200L board with 5000w@40kmh.
Life is not fair😜
Haha my remote shows me all the data while riding. No seriously, im just very lightwaight and with a gong M I can go so slow.
That is really cool.
From other watersports I can tell you bad entry angles/positions below the 50km/h mark is when the water starts to feel pretty harsh in a crash. When you get north of 50km/h you can get pretty hurt and the water can feel like you are bouncing off concrete. I have seen someone do cartwheels across the water at 65-70kph and definitely not by choice! I generally try to form into a ball and skid on my back if I am hitting the water hard at high speed and not attached to anything.
I would consider a helmet and impact vest if you don’t wear them already. A neoprene hoodie or tight snowboarding helmet with ear covers works great to protect the ear drums for these types of shenanigans. Make sure it is tight or it can turn into a bucket where your chin is holding the handle.
I’ve just been doing some testing on 16S with an SS56104 500KV and PLE040 gearbox with the VESC 75/300 and got to 54KMH (averaged up/down stream run). Running the Slingshot infinity 76 wing, with my aluminium 3 blade prop. Motor current was limited to 255A and I think it was hitting the limit, increasing from the previous test limit of 240A to 255A increased the speed so it definitely takes some amps to push this wing to these speeds. I wish I got some more data though.
Looking forward to seeing this get beaten!!
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Could you by time Share the logs? I would Like to See consumption vs Speed.
If I recorded logs on this ride I would share them! I’m really curious to know what the power consumption was at this speed and the speeds above 40kph. I’ll take it out again in a few days and get a log on 16 S and share it.
Here’s a log of the exact same setup on 12S. https://youtu.be/D7c8BObyICw
Get yourself a metr and all good 
You need a faster wing. That wing must be eating into your power at that speed!
It would be interesting to see what your RPM is and what the pitch of the prop is…
To go beyond 60kmph, you’ll need a foil like this: 600 + 700cm2
With the proper airfoil section:
2 Likes
Nonsense!!! A dual wing thing like that is pointless. I am 90kg and ride a 56mm wide kite wing sometimes. There’s no advantage to have a random wing poking about in the air…
Just use a wing like this which is rated up to 70kph
https://moseshydrofoil.com/products/front-wing-671-race-surf-wing-windsurf-570-cm2
I’m disappointed you missed an important detail: you’re 90kg but your board just lifts 45 to 50 kg due to the kite lifting component when stationary at 10 o’clock. On an efoil, the foil lifts 100% of your weigh (90kg) plus the 30kg of the efoil = 120kg that’s three times more lift that a kitefoil has to provide with the same rider.
That’s where the top wing could come handy, time for the bottom wing to generate enough lift while gaining speed for your 120kg…
Yes, 80kg efoilers can use windfoil front wings but those wings are still large. To decrease the front wing wet surface under 600cm2 and go fast, there aren’t many possibilities.