Slash 4x4 Buggy 1717 6s

[Lizard]

Put a TPPower 4070 3Y 1440kv in the Slash. Heatsinks are from Dr. Mad Thrust Hobbyking. 30t pinion and 36t spur should give 184kph (114mph) theoretically calculated with 3.7V per cell and (measured) 1550kv.

Tried it out today and reached 172kph (107mph) :D

[youtube]QtvF6btCq0c[/youtube]


Motor ran great, but not too long :(

During the first battery, suddenly the motor spooled up but the car wouldn't move. First thought broken slipper or loose pinion, but after looking more thoroughly, it's weird: The rotor can be turned with almost no resistance, there is no magnet drag at all (before, magnet drag was very strong) and there are grinding sounds. I don't think it's de-magnetized, checked motor temps ofen, never got higher than 52 celsius. Since the motor spooled up, but the pinion wouldn't spin, I think the only explanation is, that the rotor somehow came loose from the shaft?