Yes we have done testing , two different boards and a kite foil and a sup foil . The load cell indicated 30kg load to get the board to pop and then reduced to 7-12 kg load when foiling . the kite foil took 5-10 kg more to pop then was similar load . both pulled directly behind a boat. load cell was calibrated in the 0-50kg range and has 3000 increments.
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Interesting
Was that with a motor pod or a pure board and foil setup?
Foil and board only aprox 100 kg auw. Prop would add drag even when spinning but it gives a good rough guide . We derived 48v and 3kw to be safe , i know of a rig running on less than 300w but its impactical for us. The foil is a scary aspect and roughly 1.5m wide
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cheers thanks for that that’s what I was looking for. I guess I will have a try with the scales I ordered when I get them. Many thanks
If you want a system to start with less problems, choose a board volume 25-30 liters minimum more than your weight. Try to move the weight of the electronics forward near the nose of the board as possible. A front wing of sup like go foil, naish malolo, takuma, I think takuma is perfect.
I can lift with 8s direct and jet, my weigh 70kg.
And start working from here to reduce parameters.
Too late. My board is about 80l and I have the Cabrinha foil from 2017.
will be more difficult to start, you will need gearbox and power, the more power you need the more wear the elements will have and break before, so the ideal is to get a system good balanced and light, if possible.
Well, its not light either. I am probably going only for fibre glass and the foil is very heavy : )
I hope there will be a direct drive motor by the time the board is ready. Didn´t buy the ESC or Motor yet.
Great info Virus!
I agree larger/wider board will make it much easier to get up and ride, plus the larger boards require much less thrust to get moving and up also.
What is your setup with direct jet 8S? motor type/size/kv, ESC, are you still using the 56mm impeller you made?, and what is the diameter of your exit nozzle 40mm-ish?
The same 56mm impeller.
400A ESC Flier, waterproof and water cooled.
motors: leopard, sss motor and tp power, tp power can support more amp.
exit nozzle ok
You motors are all 56mm diameter?
jet system 56mm but my idea is try the same gearbox diameter in open prop 30mm, next tests
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Wow, cool 30mm propeller is getting small, interested to see how it works
I’m a little confused though, you will use 56mm motor, with a gearbox, and a 30mm open prop?
Why the open prop? They are very dangerous
when I say open prop it means propulsion propeller, jet is ducted propulsion.
My propeller with gearbox is 120mm, you can see in my videos on youtube, in my jet I’m using 56mm impeller direct do you understand? 30mm is the diameter motor brushless.
If I first made an impeller jet it was because the propeller is dangerous.
I think the ducted propeller ( bigger with gearbox) is still dangerous
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Ok I get it now, thanks Virus!
You jet system is 56mm impeller, but what is the outlet diameter of your jet nozzle. It tapers in… have you tried making this larger or smaller for more thrust? We found that if your not using the jet near the surface to mix with air the nozzle outlet hole can be a little larger than normal and you get more thrust underwater.
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ok but the potential energy is not the same with bigger hole
exit nozzle looks to be about 47mm
We just redesigned our nozzle so we can easily change the exit hole to test various diameters from 37.5mm - 52.5mm (from to small, to too large, and find the sweet spot).
From my experience, the smaller the nozzle exit diameter the less low-end thrust, but a higher top end speed. But it nozzle is too large then you lose thrust also, there is a fine line, really the fine details will be more personal preference for each persons riding style and skill level to some extent.
Hello Everybody
Today I have done some thrust test of my system
Battery: 8s
Esc: hobbywing 130A
Motor: SSS, 500kv
Reduction: Neutgard 1:5
Propeller: solas 7.25 x 6"
And tha’s my recorded data:
Could you please tell me if, following your experience, the recorind are enough to foil?
Thank you very much
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