I’ve read a lot in this forum but can someone explain (demystify) a way to get a rough calculation to estimate e-foil ride times when on foil between various battery / motor size and KV / prop options out there?
There are so many options, tring to sort out which would be the optimal runtime vs weight vs power for an efoil project…
Which Voltage? 14S10P or 16S10P or 18S10P
What size motor?
What motor KV?
Propeller size and pitch based off the motor size / kv and voltage
Foil size would be based off weight but 1200cm foil for under 175lbs and 1500cm for 175-225lbs.
The article is describing electrical socket to ground currents going through water and swimmers, it’s not the same case as getting electricity from a battery where you basically need to connect yourself in parallel to the dc circuit somehow. Therefore salt water will be worse for our use case since the issue is not conduction through a body of water to human to ground.
Exactly, but there’s a basic difference: the circuit to close with your body is not through the water to grounding earth like in a socket circuit since you have a battery. It will most likely be from hand to hand between positive and negative when you’re contacting the insides of your box somehow and it will not be while you’re in the water. While you’re on the water, even with a water filled box, the lowest resistance circuit will remain inside the box.
That is theory. i experienced it “live”. I am running 14S Li battery. My battery box is wet, my battery itself is waterproof. Once my contact got damaged, and boy, that feeling was horibble. I am driving in fresh water. You really could feel the electricity and it was not nice.And I just touched my bord, hands not even close to the battery contacts.
I assume it didn’t because he is still alive. However he was one of the paths. Think of it as an electric fence or anti-shark device. The main flow of current is designed to travel a specific path every single time (they do this by super low resistance). However if you touch either you will still get a shock because you create an alternate path. It’s just that you as the pathway will always have a higher resistance regardless of medium and as a result the current can never be lethal.
Can you explain what you mean by your batterybix is wet? Is you battery sitting in water and the terminals are exposed to full water?
Thats pretty scary you got hit while in the water. I would not want to try that again!