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Heres a newbie question. what is the diff between in and out runner brushless motors? My heli's use outrunner but the look the same other than smaller. I notice almost all boat motors are inrunners.
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I too, have wondered about the differences. My Renegade Rigger has an outrunner motor it it."A quick temper will make a fool of you soon enough."
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bruce Lee. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -
I too have thought about "out runners" in FE boats. They are much more tourqey than in "inrunner".
Although if you hook one up and hold it buy the wires as it is running they have a bad gyro effect that may effect it in the boat. Then the question comes up how do they work in planes then??? Also they would be hard to keep cool....
I have not tried one yet. But I may soon....NAMBA #581
Q mono NAMBA record holder
'REMEMBER SOME PEOPLE ARE ALIVE SIMPLY BECAUSE IT IS ILLEGAL TO SHOOT THEM'Comment
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Inrunner Vs Outrunner:
An inrunner motor has stationary coils which surround the rotating magnet at the center. An outrunner motor has stationary coils at the center, and the rotating magnet on the outside. Outrunner motors generally have lower Kv ratings, meaning they run at a lower speed, but with more torque, which would allow you to direct drive larger props without needing a gearbox. Most RC cars and boats would require an inrunner brushless motor.
Last edited by ReddyWatts; 07-25-2007, 08:42 AM.ReddyWatts fleet photo
M1 Supercat - Neu 1527 1Y, 8s / Mean Machine- Feigao 580, 8s, 120 HV esc
Mean Machine - Feigao 540 14XL, 8s, 100 amp HV esc, X537/3Comment
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Right on the money Mr Watts. The problem is with larger hulls the low kvm and need for bigger props = Torque roll.Last edited by SJFE; 07-25-2007, 04:36 PM.Comment
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How do you cool the motor, since the windings are in the center of the motor designed for air cooling by the airplane prop. We use the inrunner motors with water cooling on the outside of the motor where the windings are.Last edited by ReddyWatts; 07-25-2007, 04:20 PM.ReddyWatts fleet photo
M1 Supercat - Neu 1527 1Y, 8s / Mean Machine- Feigao 580, 8s, 120 HV esc
Mean Machine - Feigao 540 14XL, 8s, 100 amp HV esc, X537/3Comment
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It would apear you don't cool them. Not good for a marine app...Comment
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my outrunner heli is 3700Kv though, that is not low. uses 11.1v 35amp esc
but your saying outrunners are more torque. This is granted for a .40 heli. very small but if I could get a 540 size 3700Kv outrunner than there would be a better chance of that working then a 540 size 3700Kv inrunner?Comment
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It has a built in fan for cooling. macined very, very niceComment
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