Cypher ESC

[helijohn]

I've just read that the Cypher ESC has heat shrink over the heat sink.

One thing I did do was to cut back the heat-shrink they put over the ESC heat-sink. Apparently overheating can be an issue, not surprised with no air circulation over it !!!

I noticed mine gets a lot lot warm so what exactly do I have to cut off to get the air to it. I don't want to be hacking away willy nilly.

[evolusia]

Since they're giving these things away I bought 3. First flight, ESC shut down after 2 mins hovering and setting up. ESC stone cold, lipo voltage 11.9v. Swapped for one out of other kit, same result. Swapped for one out of third kit, this one also shuts down without warning. I've cut the heat shrink away over the finned side to expose majority of the fins on all three ESC's. Still the same result. Anyone else having problems? Oh and before anyone advises It is set up to hover at +5 degrees and 60% hovering throttle which gives about 2600rmp on the head.

[helijohn]

Since they're giving these things away I bought 3. First flight, ESC shut down after 2 mins hovering and setting up. ESC stone cold, lipo voltage 11.9v. Swapped for one out of other kit, same result. Swapped for one out of third kit, this one also shuts down without warning. I've cut the heat shrink away over the finned side to expose majority of the fins on all three ESC's. Still the same result. Anyone else having problems? Oh and before anyone advises It is set up to hover at +5 degrees and 60% hovering throttle which gives about 2600rmp on the head.

TBH although I don't fly mine all that much I have never had a problem with the ESC (and I hope I am not tempting fate now). I found the heli to be one of the most well mannered in that size range.

[cjcj1949]

It's not the heat sink temperature that shuts it down. It's the temperature of whatever is measuring the temperature or the temperature of any chip that has an internal check like the voltage regulator. You could try a separate power supply as a simple fix. Either batteries or a separate SBEC. You might find taking the heatsink off and checking that all chips are at the same height would tell you what was going on, some may not have enough heat sink compound on. Someone might be interested in investigating these and finding the problem. Better silicone grease as they use for pcs and a bigger heatsink would be a very cheap fix. They could still make a cheap source of components. Surface mount components are easy to remove with the right equipment.