Vibe log check.

[Lars Odland]

Can someone please confirm if I have got the frequency right, the one to the left is the head and the one to the right is the engine?
First time using the log function, its from a Trex 600N.

[georgi UK]

=] yes, you have it correct.... the one on the left is double headspeed, so this is being seen at the blades....

[Lars Odland]

So I have a badly tuned engine/worn engine and a worn head/of balanced head/blades?
Am I reading this correct?

[Luvmyhelis]

No on the head, the double rotation speed shows either worn or soft damps, sloppy grips or links, maybe a worn swash? It can also reveal blades where the fore aft Cog is off or blade profiles are not exact. Out of balance blades will show in the original head speed rotation. Yes, on the motor.

[georgi UK]

=] you have a nitro engine, and need a suitable mounting pad for the gyro to help eliminate some of its vibrations, 1 page from a book doesn't tell the whole story! Starter shaft bearings, clutch assembly, fan, all have to be running smoothly, mixture settings too.

Then you have blade dynamics to consider, dfc looks the worst from what I can tell if you have this? dampers, blade grip friction, collective range, play in the linkage, damaged swash, main shaft and bearings, feathering shaft and bearings, it goes on!

[Lars Odland]

Thank you very much both, for the detailed info.
I can reveal that this is an old 600N, and everything above the swash is brand new (black Align damps), and Align blades.
Maby its time to change the startershaft bearings and have a look innside at the engine bearings as well.
About the mounting pad, I just followed the instructions, foam, metalplate, twosided tape. Have read that the Zealtape will make the helicopter feel a bit "sluggish". Also many say they hard mounted the gyro using just twosided tape between the gyrocase and the gyromount. Any experiences?

@Luvmyhelis: Can you explain what you mean by: It can also reveal blades where the fore aft Cog is off
Thanks guys