Vibration analysis - Help with an Oxy 3 Qube

[Bladecrasher]

I have an Oxy 3 Qube (3 blade head & 3 blade tail) with the uSpirit installed and have about 20 flights on it.

Once during a test rescue in flight, the heli drove downward, nice and flat ( just in the wrong direction) breaking the skids when it hit ground.

I believe this behavior is a sign of to much vibration.

All my pre-flight tests, and some in-flight test rescues , since this downward event have been flawless. Collective goes upward as expected. In checking the logs, I occasionally see warnings for high vibrations, even when I have had successful test rescues in flight. I now test much higher up so I can recover should the heli head toward the ground.

Today I removed the main and tail blades and held the Oxy to my workbench with tape. Then using the BT android app I checked the vibrations at 3 HS settings and found this info:

HS of 2950, 3175 and 3650

X-axis: 4%, 5%, 8%

Y-axis: 60%, 60%, 38%

Z-axis: 18%, 17%, 25%

Attached are 2 photos of the showing the vibration graph. The vibs are slightly different than what I noted during the testing, but close.

Do the graphs or values noted above mean something concrete that I should check on the Oxy?

Other than having concerns about rescue, the uSpirit has worked well on the Oxy.

Thanks for any input.

[xokia]

Your questions would probably be better suited for an oxy forum. They build the tool not the heli. Vibration characteristics are going to be specific to a certain heli.

That said have you checked your belt tension?

[Bladecrasher]

Thanks, but since the tool (fbl unit) is creating the graph and data it seems like they would have some thoughts on how to interpret this information. Ultimately I will need to make changes like may be the belt tension. Maybe that is the only significant moving part along the Y axis.