Someone told me on a video and I also noticed that when the spoolup completes, there is still a pause and the RPM jumps to get to the target. So for example my ESC spools up to 3100 with a target of 3200 at 80% throttle. It completes the spoolup at 3100 waits for a few seconds and then it seems to realize that it really needs 3200 so jumps suddenly to the target RPM of 3200. So it almost instantly jumps 100 RPM which is audibly noticeable.

I have all my settings per recommendations on the manual. I have my Hobbywing ESC 60A v4 at 120Hz and the throttle range values per the manual. Also I have the ESC configured on Fixed Wing mode and AFW off. I also changed my governor settings to 5 and 1 per initial recommendation.

I am doing these tests on the bench, but it has always happened when flying I just had not wanted to troubleshoot. I completely redid my setup in hopes of fixing it, but that didn't work. I upgraded my ESC firmware, FBL firmware and did a factory defaults reset. I even started a brand new program on my radio.

I am using an Spektrum DX9 with a 4649T. I don't have the telemetry wire plugged in as the 60-A does not support Flight Pack capacity which is what I would want to use telemetry for.

Any way to try to fix this strange jump in RPM?

This can be caused by too high Governor Response.
Without main blades the jump can be significantly higher and also target RPM can be not precise as there is no load.

Also it depends on your collective pitch. Is your pitch at around 0% during spoolup?

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Spirit System developer

I did a spoolup with blades yesterday and I did not notice the jump. But I have now a huge discrepancy on target RPM with and without load. Without load, I can see on the Spirit software around 3200 (after the jump from 3100), which is OK making the math with 4100 max RPM at 80% throttle which is what I have on my radio.

But when I read the RPM through the radio telemetry screen, it says I am only giving it 75% throttle (although the throttle curve is 80%) and giving me only 2800 RPM and indeed I did hear the RPM was low.

My settings are as suggested initial settings on the manual governor response at 5 and holding performance at 1.

EDIT: and yes I do spoolup at 0 pitch so the heli remains on the ground and doesn't give negative collective load. I do that also without blades as I usually keep it at 0 since I was setting up zero pitch before, although that I cannot be 100% sure.