Thanks! I understood. Let’s try a lighter rider!
Yes!I weigh 85 kg! But he’s not going. I think we’ll figure it out over the weekend. There is one thought!
Hello Anatoly…
I have seen that you used lifepo4 32700 cells.
Are thay any good.
I habe built battery pack from them my self…
I have 12S5P setup, hope it will work…
Can you share your experiance with them?
Hi! Everything suits me. I ordered their assembly from a master who is professionally engaged in assembly. But I need to redo my waterproof case, it is made of thick plywood and does not conduct heat. After two hours of operation, the temperature reaches its limit. And they are heated more strongly at the end of the discharge. I have a build of 13s 10p 48 amp hour. More than an hour of skiing!
Have you installed BMS and thermal sensors?
Thanks on your fast response…
Yes i have daly bms, but i dont have theram sensor…i have tryed to pull around 180A from pack and didnt notice any heating, except cables…
Pack was cold to touch.
But on 180A i have big almost 3V voltage sag…
Is that normal…
I know that most of cappacity in lifepo4 is betwean 2.8-3.2v anything higher will sag realy fast.
I’m sorry for the misunderstanding! I didn’t read your question carefully, and you didn’t read my feed. I have already switched to the 21700 tesla cells. And my lifepo4 died probably from overheating. They were bloated. And they really only had enough for 30 minutes.
Jey i know you switched to tesla 21700…
Im asking about lifepo4 cilindrical cells you used first.
Did you have problems with them?
This ones.
Oh, those! Sorry. I forgot about them. This board was left with my friend, the sun is working, but the riding time is small. And in two years, he changed 6-7 cells! They’re dying for some reason!
Thank you…
You ware realy helpfule…
I will get some spares then…
My pack is 12S5P around 30Ah.
I hope to get 30-45min of riding with them…
Btw whare did you buy tesla cells?
When my cells died, they swelled by 10mm,waiting for new ones from China for 2 months. Therefore, I ordered from a friend under my mailbox. He is professionally engaged in the repair and assembly of batteries for scooters and bicycles. He recommended these. I’m happy! More than an hour of skiing and about 20 km of running! Depends on the speed of course.
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Today I tested three propellers for traction tied to the pier. The 5 " screw gave a thrust of 40kg with a battery current of 55 amps. 7" - 30kg at a current of 43A. Flite 23kg-43A.
After that, I tried to stand on the wing with a 7 " screw on which I failed. And lo and behold! Somehow I managed to disperse the board in the turn and come off! Skiing " is much more fun! And the review of the trigger, too! Yes, my weight is 10kg less than last time. Then I asked a friend weighing 75 kg to try it. He got up without any problems at all!
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Video with a step7". I still managed to tear it off!
Conclusion. The factors you will eat on this screw turned out to be more than I thought! These are the weight and size of the wing, the power of the esc., the battery configuration, the litre of the board, the width and shape of the bottom, the ability of the board to detach from the water. And before you buy an expensive screw, check it all out!
Of course, I will check my settings again, but it seems that the 7"screw is too big for my build and weight!I found a screw with a pitch of 5.7" I’ll try it!
You are totally right, the factors affecting the optimal propeller ar many. You can calculate on computer what ever you like, but in reality things might work out differently…so many things in theory that might not work out in practise.
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