Setup issue
 

Hi,
I am kind of new to RC heli's. I am setting up my Trex 450, and have an odd problem that I cannot fix.

I think theheli is set-up (I have it fixed to a moving 'wheel' so i can power up, spin it round, look for vibrations, set gyro etc...... This looks generally ok
No apparent missalignment, or vibration (see below)
Gyro seems set-up ok

The problem is that at about50% - 60% throttle the heli (sometimes!!!) begins to sound different i.e. I can hear a low frequency 'beat'. Also, the tail starts wagging (No rudder input). If I add more or less throttle the problem appears to go away.............. i.e. it appears in a specific band, and dissappears outside of this band.

I cannot solve this, any tips very greatfull.


Thanks
Phil

RE: Setup issue
 

You'll need to post a video. Not certain I understand the problem. What kind of gyro are you using? What gain? What tail servo?

RE: Setup issue
 

Hi Again,
gi1mo2 and anyone else who read this..........

I think I found the problem, the belt to the rear rotor was loose and slipping; the tail would instantly drift andthe gyro compenstes (hence the wagging).

Is there any guidelines as to how tight the belt should be?? Align manual says 'lightly tighten'

Regards
Phil

RE: Setup issue
 

I normally apply light finger pressure and the belt sides shouldn't touch.