Duck
Active member
I decided to go big or go home with my Mig3 and took the power setup from the Strix Alatus and put it on the power pod. It flew pretty well on a very windy maiden but both packs I ran through it came down moderately/a-little puffed. I am not sure quite what happened and could really use some input on where I went wrong.
The setup:
Cobra 2217/08 2300kv Motor (Alatus branded)
Cobra 60A ESC (Alatus branded)
1800mah 4S 60C RMRC Battery
6x4E APC Prop
This is exactly the setup I use on my Alatus, in fact the battery I bought just for that plane but borrowed it for this. I did two flights and both came back with slightly puffy batteries.
Flight 1:
5 minutes
Fully charged battery
End voltage 14.60V (moderate puffy)
Temperature: 65F
Mix of throttle ranges with a few bursts at 100% up to maybe 20-30 seconds at once
Flight 2:
6 minutes
Fully charged battery
End voltage 14.81V (slightly puffy)
Temperature: 65F
50% except at launch where I might have hit 60%
It seems like I should be well within spec _except_ I've overpropped the motor for 4S. This is the exact power train the Alatus ships with and that flies fine with much higher AUW. I've never seen puffing on that. Overpropping the motor shouldn't do anything but overheat it, right? Worst case some fractional increase in amp draw due to friction? I tested the exterior temp with my hand maybe 20 seconds after launch and it was barely warm. The ESC was not warm to the touch.
The motor is rated at 43.71A on a 6x4E Prop (http://innov8tivedesigns.com/images/specs/Cobra_2217-8_Specs.htm)
The battery is 60C so 1.8 * 60 = 108A. More then double the rated draw of the motor on that prop.
Why am I seeing battery puffiness? I should be well within the AMP draw of the battery, especially for the second flight which I really toned it back on the throttle to see if the other battery was just bad. I would hate to have this plane be $30 bucks per-flight if it kills batteries.
As it is, I won't fly it again until I can figure it out. I don't want to kill all my packs
The setup:
Cobra 2217/08 2300kv Motor (Alatus branded)
Cobra 60A ESC (Alatus branded)
1800mah 4S 60C RMRC Battery
6x4E APC Prop
This is exactly the setup I use on my Alatus, in fact the battery I bought just for that plane but borrowed it for this. I did two flights and both came back with slightly puffy batteries.
Flight 1:
5 minutes
Fully charged battery
End voltage 14.60V (moderate puffy)
Temperature: 65F
Mix of throttle ranges with a few bursts at 100% up to maybe 20-30 seconds at once
Flight 2:
6 minutes
Fully charged battery
End voltage 14.81V (slightly puffy)
Temperature: 65F
50% except at launch where I might have hit 60%
It seems like I should be well within spec _except_ I've overpropped the motor for 4S. This is the exact power train the Alatus ships with and that flies fine with much higher AUW. I've never seen puffing on that. Overpropping the motor shouldn't do anything but overheat it, right? Worst case some fractional increase in amp draw due to friction? I tested the exterior temp with my hand maybe 20 seconds after launch and it was barely warm. The ESC was not warm to the touch.
The motor is rated at 43.71A on a 6x4E Prop (http://innov8tivedesigns.com/images/specs/Cobra_2217-8_Specs.htm)
The battery is 60C so 1.8 * 60 = 108A. More then double the rated draw of the motor on that prop.
Why am I seeing battery puffiness? I should be well within the AMP draw of the battery, especially for the second flight which I really toned it back on the throttle to see if the other battery was just bad. I would hate to have this plane be $30 bucks per-flight if it kills batteries.
As it is, I won't fly it again until I can figure it out. I don't want to kill all my packs