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Fastest prop for C-Pack Radial


Well-known member
Just wondering if anyone's had experience with the C-Pack Radial (1180 KV) motors on 4s. I know that John Overstreet flies all his planes on 4s with a 10x45, but do any of you know what pitch prop an 8 Inch prop is suitable for the motor. I currently am using my C-Pack twin on 3s and 4s on 8x4.7, but am afraid to go up to 8x6 and maybe 8x7.



Legendary member
Only one way to find out.

Start with the 8x6, run it for 10 seconds, stop the motor & grab the ESC & motor, checking for heat. Warm is OK, but if you can't or don't want to hold them, stop the test, that's too hot. If it passes the 10 second test, try a 30 second run, then a 60 second run, then a 2 minute run. If the 8x6 passes you could try a larger prop, if you want.

It's always a good practice to check the motor & ESC temp after each flight. Props that worked when it was 70 may not work when it gets hot outside, 95+.
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