New builder from Lyon, France.
I really enjoyed wake and wind foil this summer, but the conditions are not often good.
I have quite a lot of experiance with this king of systems (controllers, batteries and such) but using that in the water not so much!
F one rocket 70L board
Slingshot fpump quantum 100 (1750cm2)
8S4P 21700 (50E cells, 50A max on the pack) no bms yet as I could not configure one properly in 8s
Maytech kit with 6374, folding prop in printed nylon, vesc 100A
Ammo Can box for all electronics
I used a Waterproof yf-24 connector on the back of the box to have Quick connection and ease the handling. The connector is probably the first and early failure point, as it is only rated 20A RMS, 30A on some docs.
I modified the tool less/QR mast mount from the fusion files (thanks to the original designer) to have slingshot mast profile, also found here on the site.
Missing some bolts and proper mount to the board until I Can test it, probably this weekend with great weather.
I think you are the first one to use such a box for the electronics in a project, especially for an Assist. Members prefer plastic cases and use the amo box as a protection against fire for battery storage.
A few questions:
You want to build “light”. What is the box empty weight ?
First test went without drama, but without succes either. The VESC was set first with 60A phase, and the system could not make more than 15A battery then. After setting phase amps to 75 then 100, I could reach 25 then 40A battery current.
Unfortunately, the VESC goes into some throttling after 5 seconds or so. I could not get on foil yet, combinaison of the techchnique and lack of power so far. I think I have to mount the vesc directly to the box to cool it. I dont think I was hitting LVC, at least I could not really see it on the remote.
I had a litte bit of water coming in from the bottom connector screws, I re-did that with better sealant compound tonight. The connector itself survived and was not hot.
I tried different mast positions, and different foil settings, but each time it felt like it pitched up way too much (some pictures show it, I was leaning forward as much as I could)
I would offer a suggestion. Before you try standing try to get up on foil while you are on your knees. Keep the board flat on the water and get it going at least 15kmh before flying The idea is to get sufficient speed through the water BEFORE you try lifting off.
The photos look like you are getting stuck with a very steep angle of attack on the foil and the board trying to push through the water. Very hard to get the board levelled off once you get in the position. Just stop and save the battery capacity and simply start again.
This is the Slingshot FSUP foil I used before I went to Gong. Stabilizer is flipped on mine compared to yours but it only goes on in one orientation so not sure if you can flip yours. Worth trying I guess.
When I started efoiling I was having the same pitch up issue. The only thing that fixed it was more board speed and then a slow rise out of the water onto foil.
With a mast placed in the middle of the fuselage, it seems you have a windfoil version of this hydrofoil.
If your F-One wingboard allows it, your feet should be positioned 15+ cm further forward than with a “classic” wing foil which could be uncomfortable. Try to borrow a wingfoil gear and test again.
Changed some settings for today tests
Little higher temp of the mosfets
Safer / reasonable power limits.
I tried on the most forward position on the mast/board and the front wing position, not middle.
I managed to get on foil when kneeled on the board, by pumping it. The vesc thermal throttling comes top early, I need to make a new and and better heatsink. Still a half succes
Did not manage to get on foil when standing, even when all the way forward.
The waterproof connector also bit the bullet as expected, actually the ground connection was smaller than L and N, did not see that. Motor was starting in either direction due to the phase disconnected
I will try to redo this connexion with MR60 connector in epoxy.
With the overheated connector, water was coming thru the connector body, apparently no damage to electronics.
When you look at the pictures, it still feels like the foil has the wrong attack angle.
I also use it for pump foiling and it is not gliding like I want, I feel stalled unless all weight is on the front, but it is like an airplane with too much UP trim. It will fly if enouth weight is UP front, but it will not glide well or require lots of motor power.
In dock start one Guy had good sucess with the 48cm rear wing, so I ordered one for tests. In the meantime I will design a New mast clamp, slip on in hard tpu.