Esc sizzling???

[RuntheraceAMC]

My esc makes a sizzling noise when plugged in to any battery. I know I'm pushing it on the current set up but I'm wondering if this is an indicator of impending failure.

Set up is a BJ 24 with a leopard 3650 2750 kv with a BJ 29 prop and seaking 120a. Running 5s 45c batteries

[martin]

That esc is probably not long for this world turning nearly 51000 rpm unloaded, also the bj29 prop is a large prop for that motor running at those revs.

[NativePaul]

I would guess at blown caps, are they distorted or dirty looking at all?

[RuntheraceAMC]

No that I noticed. Still works well. No diminished performance.