It is difficult to tell just what happened by reading the OP’s initial post. Let me see if I have it right:
- both motors burned up in the same hull, several years apart
- both motors were running 4S
- both motors used different SF ESCs
- both ESCs used Auto timing
- both motors used the same x440/3 prop
- both ESCs work fine after the fires
What we don’t know:
How were the motors damaged: burned windings, seized shaft?
WTH does “buzz bomb” actually mean? That was the term for a German cruise missile during WWII.
Does the boat run wet or loose? Does it have a hook in the bottom?
What cooling was used and was it effective?
Just how long the boat ran, “around two minutes” tells us little especially if no timer was used. Most people underestimate the time they run.
The temperatures of the motors, ESCs and packs after successful runs.
If the motors had been overheated on previous runs before they failed.
Auto timing was not the problem, SF’s timing algorithms seem fine. With no other information available, the common conditions for both motor failures are likely the boat (poorly trimmed, hooked bottom), the driveline setup (insufficient gap between drive dog and strut, excess bend), or the driver (excess run time for the setup, excess test running out of water). But we really need to know more details to help.
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