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Yes a couple people at my field did. They used larger packs than that video and were pulling over 100A on a fresh charge. Castle usually is good about leaving some room for burst amps but I'd at least use a 100A ESC if not a 120A. If you are using cheaper ESCs I'd definitely go with 120A.
BTW, of the two one ended up smoking the motor and one still flies his now and then... |
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I think MrZen tested 8s and peaked 84A? Not sure what battery that was. Ali is very smart, the good thing about going with a smaller lipo is it limits peak amps and helps save the motor. Also less weight better performance. Maybe a good idea to stick a HK heatsink on the motor to to help it cope. |
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I have never seen a motor draw lower amps on a higher cell count (Voltage) set up.
Many people change out their motor to a lower kV when going 8S to get a lower Amperage and still get a higher Voltage but in this case you are talking the same motor so you will have higher Amps... Ohms law. If your set up on 6S draws 80A (with a battery that can supply the voltage without sag) the same set up on 8s will draw 106.67A (again if using a battery that can supply the voltage without sagging). |
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Last edited by Evan D; Oct 18, 2021 at 02:48 PM.
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Yes going to a smaller capacity, lower C rated battery will limit the Amps because the battery can't handle the draw but that is kinda defeating the purpose. He used two 4S 2200mAh 30C. Good for only 66A constant.
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Thanks. I used a silver metallic pen with a fine point. In this case, by Painters. I went over the panel lines in the foam then used mineral spirits to defuse and weather the look. Good luck! Alan
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The stock fan on 6s draws only 67A peak on the bench, maybe a bit more installed. I too was expecting way over 100A on 8s, but I guess with only 2200’s they sag so much that peak amps are under 100A. Although they never mentioned amps in that video. Another option to lower amps on 8s when using a good size battery could be to swap the rotor to a less loaded rotor like Change Sun 10 blade (around 10% lower amps) or Freewing 12 blade, or even the new Xfly 12 blade. I have set up my Eflite/FMS 1850 fan with a PowerFun rotor instead of the stock rotor which is even less loaded, but I don’t have a pair of good enough 4s batteries for a proper test. |
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Last edited by green_flyer; Oct 18, 2021 at 04:14 PM.
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I did a quick test some time ago, but the batteries sagged too much when I reached full throttle, below 3.5V/cell
This is the stock fan, only the rotor was replaced with a PowerFun rotor. Shows promise, but in the video the thrust level is the same as the stock fan on 6s. I guess that powerfun rotor has much lower pitch than the stock rotor.
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I will look for a Castle 100A that can handle 8S. I run one in the Habu32. Any idea what size bullets I need for the motor side of the ESC? |
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Managed to make my own pin for this with a flange by heating it red hot tapping the end and then using the drill and a Dremel to shape it, I have to say this will be the last plane I am buying off this vendor E Flite as this pin is a consumable item and they do not sell it anywhere I have found a potential source on RC Castle but honestly we should not have all this mucking around to fix something as simple as this
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