Vibration on whole spectrum

[augur]

Hi.

I have vibrations on the whole spectrum with my TDR and a SK720BE. Any ideas what could cause this? Perhaps some gears on the tail because they are very tide and I have to tune it???

The SK720 is updated to 4.00 firmware.

Thanks,
Nils

[georgi UK]

=] while I check the log, how did she fly?!

huge vibe front to back, it's impossible to tell from which area, the whole heli is saturated in it, nothing obvious in the drive? you say tight tail gears?

[augur]

It flies fine. There is only a strange new sound produced by the tail like a fan.

I changed the bearings of the HK4530 some days ago....but the vibs with motor on the bench goes down to 1.0 from 1.7.

The gears have nearly no space between the cogs.

[georgi UK]

=] I suspect the noise is coming from the gear tightness then? and causing the vibe, if anything the tail should sound sweeter, there was an adjustment made at the end of testing where this was noticeable.....

[lcc014]

Originally Posted by augur

It flies fine. There is only a strange new sound produced by the tail like a fan.

I changed the bearings of the HK4530 some days ago....but the vibs with motor on the bench goes down to 1.0 from 1.7.

The gears have nearly no space between the cogs.

I also noticed the fan sound in the beginning of flight then it disappeared. Mine is SK540 and not sure where the fan sound was coming from....

Ching-Ho Cheng