Hello,
Total noob here, first helio. I have flown planes before however.

Here is my setup:

Helimax Mx-400 (not pro)

Mystery 4000 brushless motor
-Rpm(Kv): 4000 Rpm/V
-Max Currect: 23A
-Max Eff: 98%

Align ESC 35 amp
rce-bl35x

The XMHOBBIES 300/400/450 size
helicopter gyro

TrueRC 11.1V 1500mAh Li-Polymer battery pack
3S1P1500

TX
Futaba T6EXHP

RX
Futaba R146ip

4 hitec hs-56 Micro Servos

Here is my prob:
Got everything installed and adjusted was able to get it to bunny hop for a couple of batterie
The next day when I got to about 50% throttle (just developing lift) my main rotors started oscillating wierdly and made a farting sound.

Inspection showed that the rotor screws (4102-004) and bushings (4014-001)were gone.

Replaced this hardware and flew another battery.

Next time I found them loose again and aborted.

Tore down rotor head and Loctited those screws.

Now my collective seems to have more throw and the farting oscillation is back.

Has anyone experienced anything similar.

tia
urthlight

I wonder if the farting noise is your two blade not tracking properly. When you look at them spooled up they have to look like one blade. The main problem may be that your swash plate isn't level and this effects everything. Level that to start and work your way up to getting the two blades at the same pitch.

LOL, are you sure its the helicopter?

could i show a video here ???

Video?? Absolutely. The best diagnostic tool on the net.

Blade balance WILL DEFINITLY affect your collective performance, however the noise you are hearing IS coming from the blades & it's OK! That's the blades beating the air around them, both my birds the MX300 (was an AXE CPv1) and my T-rex 500 make that BRRRRRAAAAAAPPPPPPP noise when both climbing and upon fast desends with collective pumping. The BIGGER the BLADES the LOUDER the noise!

You SHOULD go through ALL the screws on the ROTOR HEAD & LOCTITE them ALL! Loose screws will END your Heli Training "Quick, Fast & in a Hurry!" I would also go through the pitch set-up again (using a pitch gauge) to make sure your getting at least 10' postive & 10' negative pitch, your swashplate height could be off, leaving more pitch on one side than the other.

The reference pics show Normal Mode low & high & Idle-up high & low.

Shadow

Blade balance WILL DEFINITLY affect your collective performance, however the noise you are hearing IS coming from the blades & it's OK! That's the blades beating the air around them, both my birds the MX300 (was an AXE CPv1) and my T-rex 500 make that BRRRRRAAAAAAPPPPPPP noise when both climbing and upon fast desends with collective pumping. The BIGGER the BLADES the LOUDER the noise!

You SHOULD go through ALL the screws on the ROTOR HEAD & LOCTITE them ALL! Loose screws will END your Heli Training "Quick, Fast & in a Hurry!" I would also go through the pitch set-up again (using a pitch gauge) to make sure your getting at least 10' postive & 10' negative pitch, your swashplate height could be off, leaving more pitch on one side than the other.

The reference pics show Idle-Up Mode High & low & Normal mode low & high.

Shadow