Intermittent tail wag

[Coopz]

My Blade 450x was flying fine with fibreglass blades. I upgraded to CF blades and it suddenly developed a nasty tail shake at spool up. Messed with the gyro, checked for vibration ect. Ended up going back to the fibreglass blades, but it hasn't fully fixed it. It will often take off fine but suddenly start shaking, yet moving the rudder will fix it. Some flights are fine yet others it happens frequently.

Can't diagnose the cause...

[bazsound]

somethings either bent or out of balance.

It seems hard to believe that simply changing the tail blades would cause such bad behaviour. and the probnlem remains after changing back.

have you changed anything? how tight/loose are your tail blades.

normally wag is usually binding, but in this case its probably vibration messing with gyro

[vyrnguy]

Originally Posted by Coopz

My Blade 450x was flying fine with fibreglass blades. I upgraded to CF blades and it suddenly developed a nasty tail shake at spool up. Messed with the gyro, checked for vibration ect. Ended up going back to the fibreglass blades, but it hasn't fully fixed it. It will often take off fine but suddenly start shaking, yet moving the rudder will fix it. Some flights are fine yet others it happens frequently.

Can't diagnose the cause...

Which gyro are you using?

[yakky]

Time to do a standard check for vibes and binding. You could have slightly bent your spindle while changing blades or something else might have gotten tweaked.

[Helique]

Did you change main blades, or tail blades?
If you changed main blades, perhaps they’re not tightened properly, to loose or to tight, causing vibration?