hi,
what's the differences between those coreless and brushless servos?

what're the pro and con between these two?

well brushless is a little more expensive but you get 5x more servo life. dont forget the speeds. but what the track owner and lhs owner told me that the coreless motor servo would make it a little easier for me to drive because its not tooooo fast.

well..., coreless and brushless servo speeds are comparable. some coreless are even faster than brushless.

coreless and brushless are totally 2 different 'technology'?

The JR 9000s and 9100s (0.06 sec) are listed as being faster than the brushless Futaba servos which I think is somewhere around 0.10, but I have heard the Futabas perform faster and better than their specs would indicate.

coreless runs cooler and will last longer

Where are you getting these figures 5x more service life, sounds like a furfy to me.

X2....as ive seen Multiple brushless 9351's fail......5X more life.

I have a s9351 and it is not brushless.

ya, true if comparing to the conventional servos.

but if comparing to brushless?

btw, futaba brushless servos start with BLSxxx

Coreless is a brushed motor with a light weight rotor made of copper hold together by glue instead of Steel core.