Thanks for the reply Mac!
So you were foiling with that motor, do you know what current it was drawing?
With 56200 it was not possible, but I could only feed it with 80A at 50V
Why dont you give it a try? Sloppy 4kW? Is this really too low power? Why dont you cool the motor from inside with water flow? 3000-5000RPM should be no problem if you secure the windings and stator with some resin.
Yes, I foiled with that motor. I really was never up continuously on the foil for more than 20 seconds. So if it was hot it had plenty of time to cool. No I donât know the current. Without my glasses I could only read my displays if I was laying on my belly. The motor had more power than I needed to foil. Without me on the board it would easily hop completely out of the water from a stand still. Maybe thatâs not a big deal but I thought it was cool.
The original 180KV was pulling way to much phase current. Thanks to Power Glider explaining to me what was going on.
I have a new 83110 180KV, its new in the box. just in case my attempts to use the 80100 fail. If I use the 83110 I will attempt to change it from delta to star to avoid rewinding it. This will lower the KV significantly.
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Hi Jake,
Did you by any chance got the time to test the 56200 you ordered ? Any logged values ?
How is it performing ?
I only ever did a rough test in the pool and didnât get any power values etc. I was holding the motor with my hands and I can confirm it has a fair bit of torque (was rotating in both my hands) and a fair bit of thrust. But it got hot quick, the motor was partially submerged deep enough so the 3D printed prop wouldnât cavitate.
Maybe it could work. But I didnât bother with it. Iâm confident there is enough thrust to maintain fouling but probably not to get up from a start and it would be pretty low power.
Interesting ! thanks for sharing the info 
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No problem! 2 together would definitely work
I found following formula that gives roughly the torque of any BLDC/PMSM motor. This one is really easy to use and no calculator is needed anymore :
T = (8,3 * Imax) / Kv
Calucated the 83110 max torque and found 6.92 NM which is pretty close to the stated 6.5 NMâŠ
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Yep work for me : 1,54Nm for my first step up with a 40mm , these was what i measured with rpm , rpm drop , I , Rm ⊠at the time
But I guess it s all depending on the correct I max , and it hard to get correct numbers for motor , and what it is I max really ? : just before everything is burning ? And how long can it hold that value ?
I got around 1,5 Nm on my motor but it was kind of continuously , more than 250A pics for take off , even if the number was hard to record at this amp value by my esc at the time ( I suspect)
a 80100 can easily pull more than 180A for take off ( for sure) which give 12Nm , and I think it s capable of a lot more before it is stall if well driven , so I am not really sure what s stand for « max » , as well as « continious »
I guess weâll rely on manufacturerâs specs 
Thatâs how we know about those values.
Just like the SSS56114 inrunner capable of 13kW peak but stated Imax is 93A @ 130V for the 360KV value, which gives me about 2,1NM.
I know it can pull way more A, but still, thatâs what the specs gives.
Given this formula , I need 4,5nm to fly at 30km/h right now 
Is it weird ? Do you consider the gearbox ?
I just had an interesting idea. Based on this formula I calculated the torque of the FR motor : (8,3x100)/130 = 6,38NM
I took 100A peak but I think you can pull more to get on plane. Feel free to correct me.
6,38NM is better than the other outrunners haha. Thatâs how they get so much punch !
1,54 nm ( continious) on my 40mm was with a 6:1 gearbox
Did not measured with my 56104 set up
Many broke coupler ( prop shaft / gearbox) here given for 12NmâŠ
With FR motor , setting 70A on my battery , to get more than 30 km/h
For take off with FR motor , I can do it with 90A ( setting motor max amp ) but it is easier and more fun with 130A settings , some people put 150A
Never tried yet « no limit » on this motor which sure I will do
A 80100 can pull 11,5nm for planning and take off @jakebarnhill1 can correct me on that if necessary
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Still, the purpose was just to see if the formula works and it does, which is nice.
I think the reason why many broke the coupler is because you get up to 20NM out of the gearbox PLE40. The above formula only gives you the torque before reduction.
Well then, if the FR motor is set to 130A you get about 8,3NM peak out of the shaft. Iâd love to design such a motor but canât find any company that manufactures a custom BLDC motor with all my specsâŠ
Do you know any company based in EU ? I tried at least 4 differents but never got any answerâŠI am based in Belgium
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see Peters post here, Any interest in custom Direct Drive Inrunner - #37 by beonwater - Propulsion System (Motor, Gears) - FOIL.zone
That might be an option but I donât now the state of his custom made inrunner project.
I did, but would rather love to build my own motor on my side. Sadly I donât own the necessary equipments. So, still open to any company that makes custom bldc motors in EU.
Remember, from a custom point of view : the more options the lower the total costs
There are companies that can cut stators and rotors for you. Then you would need to laminate them, wind them and build your own external housing etc.
I would rather go for a single company that makes the whole thing but can eventually begin like this. Do you have any company name on your mind ?
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