Serpent 960 Brushless

[samwong]

Today tested my first 960 Brushless:-

150A Hobbywing ESC
Hobbywing 2350kv Brushless motor
LiPo 4s 6000mah 22C

Gear: 45 Spur / 19 Pinion

Speed ... very very fast....with rocket acceleration also...

TEMP : ESC 45deg cel; Motor: 70 to 95 deg cel.

FINALLY................ rotor torn apart...

Anyone can help..... and suggest......Thanks in advance


Question:
1. The rotor damage is due to too high temperature?
2. or due to Rotor Quality / Brushless Motor Efficiency not good?
3. The acceleration is very good, it made me very fun to have a quick acceleration especially after corning, is this also a reason for the failure..... Need to set to much soft acceleration?
4. If it is due to motor quality... and motor now in use having much power converted to heat.... then magnet rotor cannot survive and break... what kind of motor recommended....
5. Is the 1st/2nd transmission needed ..... to avoid too much overloading of the motor.. during acceleration?
6. Is the brake disc needed for reducing the motor loading?...... Now I am using the motor brake function...

Too many questions in my mind... but it is actually very fun for this first Brushless 960, so I really want to find out what is wrong .... and continue .....