Heli tips backwards upon spoolup

[Jomaba4308]

I have my GT5 mounted on the boom block on my new Protos 500, I spooled it up for the first time just to check tracking. At center stick and YGE governed 70% throttle the heli was tipping backwards. I have a couple theories but want more opinions before attempting an actual flight.
Could it be:
- Low gain? had it at 54% and didn't think to try raising it at the time.
- The gyro trying to level the heli because the design of the heli has it tilted nose down.
- Something wrong with setup or settings? I reduced servo delay.

[rexxigpilot]

Post some pictures please. I want to see if your GT5 is square to the mast.

Also, a low gain can cause drift. Try 85-100% gain.

[Jomaba4308]

I'm not with the heli right now but I do know that the boom block is perpendicular to the main shaft and I doubt Monk could place the gyro any closer to perfect. The main shaft is not perpendicular to the floor. I had my total gain at the time at 54%, I will try raising the gain because the tail also seemed very loose.

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[Jomaba4308]

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[Stolla]

MAke sure you dont move the heli on initialization, also if you were in setup reinitialize before taking off, then check all sensors.
IF it still does it most likely vibration.
LAstly if youre not familiar with f/less take off briskly as sensors only function properly once in the air so it may feel it want to tip over because it's light on the skids and wants to compensate

[Jomaba4308]

It was a fresh initialization and the heli wasn't touched once plugged in. Also now that I think about it my Mcpx tries to tip over just before I get it in the air.

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