I went back to spray but used a clear coat automotive one, it might survive the salt water better 
I need to get back in the water anyway to get data with a different wing …
Did someone ever modified a 83110 from delta to star and tried on the foil? I modified mine, it did lower the kv from 180kv (specs) to 107kv (mesured on the bench).
If I’m correct the factor 1.73 apply also to the torque and should get the 6.5NM of the specs in delta to 11NM in star correct?
If this also works for inrunners, we could use a 192KV from Reacher Tech, Maytec (or family). 192/1.73 = 111kV 
They told me the lower kv like the 120kv are star
Just a thought, what if we print a prop with a ring attachted around the propblades ? Much safer and less drag through the water because you don’t need a mount anymore. Yes the ring will spin around but that will not cause injury as a boatprop.
I thought about it too, but it has been tested and is not a good idea unless you have a lot of power to spare.
Thanks, in your link is a picture with good results. Maybe another design prop with ring and testing once again ?
May be with a thinner ring like in the paper, it will reduce the extra losses and you can get closer to regular prop efficiency…
I’m not sure how printable it’ll be though…
@superlefax, did you give it another try?
Well, I could not even got to decent speed. The amperemeter showed over 100A for 20km/h. I was really surprised on this. I’m not really sure what exactly caused that drag.
That’s why I gave up on that one.
But of course its always a good idea to try it again with a different shape. It would be great to find a working solution which maybe has less drag than a fixed duct.
What about blades offering curved but short winglets at their extremities so that there is not cutting angles if in contact with a person or an animal ? Like planes in fact ?
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Here the illustration of what I had in mind: scimitar blades from modern submarines. You will notice that to bring the safety aspect, the winglets must be bent towards the opposite side of prop rotation direction.
In fact rotating winglets during rotation create a solid ring. Of course, the blade extremity must not be sharp and dangerous like scimitars. They coul be thickened like an olive.
Applied to @foiledagain 156mm prop, this is in yellow what it would look like adding a tiny appendix to smooth the edge:
found the submerged data: S9tim's 80100 direct drive - #54 by 3D_Pro_Innovations - Builds - FOIL.zone
So it’s something in the low 900W
I just changed laptop so my recorder setup is messed up… but from what i saw, when trying to fix my receiver full speed in air is in the 160W range
i’ll try to run it wet soon just to be sure to compare apple to apple
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Complete test done tonight all in a row with the same motor.
graph is from my elogger and I was checking with a HTRC wattmeter
First 2 are in air:
120W 4500 rpm
I’m starting to wonder if my motor is actually a 80KV… and now that I think about it, previous 160W was with the prop
Next 1 is in water without the cap to block the holes act the front of the stator
1100W 4120 RPM
Last 2 are with the cap:
860W to 900W 4200 RPM
There might be more to gain with a better car probably.
the RPM spikes before 2 and 3 are when I plug the batteries I guess…
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It’s not 80Kv looks more like 95-100ish…
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My Test for spinning under water was 825W, but battery was only 44,4V (not fully charged).
I guess with full battery, i would be in exact the same range
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Had my first run yesterday. I did not waterproof the wires. Normally it is not a problem but now they are so close to eachother it is a problem. It felt like sync problems. But anyway I still had enough power to foil. But I was laying on the board and really hard to stay in balance. I used my Fone hydrofoil for kitesurfing and that is working fine. But this seems to be much harder to learn. 14s at 130kv with pitch 5 is probably way to much rpm also and therefore to hard to control the throttle
Not a foil question
I really want to build a small electric boat for my kids, thinking about building it from the Glen-L MiniMaxed drawings (Shop - Plans and Kits - Powerboats - Outboards - Page 1 - Glen-L Marine)
This boat is to plane with a motor of 5hp. Will the C80100 engine and propeller you use be enough to make this boat plan with a kid on board?
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Should be fine.
Here is the boat I have built for my daughter.
It is powered by 56114 with gearbox.
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it’s actually easier to balance standing up than lying down
What remote are you using?
It makes it much easier if you have a “cruise control”. on my remote, I have a trigger that arms it and then a thumb wheel to accelerate/decelerate. When I let go of the wheel, it keeps the speed constant. and if it let go of the trigger, it stops everything.