Printed blades from pcbway an weerg on the way to me.
Surgery was this morning, 45/90 days off foil and other fun activity now.
Selling the gy 1401, as I wrote in the other tread I don’t really enjoy it, newer had a breakthrough in pumping it, I breach and fall before being exhausted, and is too slow anyway to ride swell.
Will test the PNG 1300 v2 instead for pumping and flat water paddle up.
I keep the 1201, that I enjoy much more and can dock start and pump almost same duration as 1401.
last sunday with 1401, 1201 and indiana condor-M for the last session of 2024, 7.5c water temp, but good weather.
We secured a new private dock for 2024 season
A Friend got his gear and car stolen from this place during summer, some guy grabbed his bag and left with his keys and car!
Thanks, it went very well. No damage reported apart the two screws and end stop they installed for my right shoulder
I think I will re-start efoil/assist with the Big board by end of January and give it a little more time for dock starting where I feel there are more risks of bad fall on start. Also paddle ups trying will wait till February.
The 1201 is from GY too.
Really like this foil, with skinny 45mm tail, it sings.
Dock starting it is not easy, needs more speed (4+ steps) than the bigger wings.
One of my friends got a 1300v2 second hand, he really likes his 1401 that he sup flat starts, but he wanted to test 1300v2 for dead start and rock start, so I will be able to ride it too. If he does not like it, he will resell it me when I’m back in action.
Testing his ketos board (1.2kg on the scale) motivated me to build a lightweight pump board.
Also asked GY to know if the have plans for it (1300 v2) or molds.
I ordered 2x parkside X20 4ah, they have 21700 cells and BMS integrated.
Ordered two chargers at the same time, total, 80€
The plan is to make a “travel battery” based on those, as they are commercial and homologated batteries below 100wh, it is probably the simplest option to travel by plane.
I want to make the “travel battery” compatible with my existing system, so it will be quite a bit bigger in the front.
Two parkside 20V in series, for 10S1P, is similar to the foil drive “slim performance” battery (11s1p P42A)
With a longer board, it will give 15-20 starts, probably only 10-15 with a short/surf board.
If it works I will get another set of two.
Making a waterproof housing will not be easy, but should be an interesting challenge.
There is only uart control possible, but with our use case and uart Rx, it should work without many limitations.
The board can only read up to 103A phase. The FETs do not have thermal paste or pad by default, I will add one.
There is a thermal sensor on the MOSFET.
The board itself is tiny, but the heatsink and plastic cover is massive.
I will update when I get it flashed/tested.
The mos are not great, to220 and 4.1mohm rdson.
For reference, mks84100hp has 1.2mohm and Tol-8 package
Plan is Full reflash of the STM32 on the board, with vesc tool support.
That unlocks the full potential of the board, outside of base fw limits.
Hope to run 50A batt and 80-90A phase, for 10 seconds needed for a start.
It is definitely possible on a 6 FET TO-220, but only with good control, good FETs and good cooling.
600w is not enough, for me 1000-1250w is the bare minimum IMO.
Control is unknown until I can see the current measurements curves, FETs are not great but easy to change if needed, cooling is easy to fix when other things are tested.
Better matching of the prop will enable to reduce the phase amps and get the needed power out without overload of the phases.
Here is the GitHub, if you look into the linked Google docs, there are divider/ADC values and max hw measurements values.
6 FETs is the minimum for a vesc, with TO220 the max current is also limited by the package.
Could work up to 100A for a short time if you change FETs to a lower RDSon type. What could be a problem is this point under cons:
“for now, it needs hall sensors (no sensorless mode). [work in progress]”
Outrunners run wet normally do not have hall sensors, hopefully sensorless was implemented in the mean time.
14c is not bad! Nice pumping, i am slightly jealous
We have ice where i am and my new year’s resolution the last two years has been to learn pumping - but hip issues and surgery stopped me.
Not at all, it is a matter of making sure the motor operates with a load small enough that the motor reach sufficiently high rpm to avoid high phase amps.
Usually, 70% of unloaded rpm for loaded would be a good start point. Because x-cross has no phase amp limit, it will provide a lot of torque and get you out, but it is way too much for the whole system.
Foil drive get away with smaller phase wire because their prop and vesc setup limits the phase amps. This is why I would like to find the 3d scan of FD prop, to know how big of a difference in pitch there is.
surface finish is better than I expected.
