Finally the problem has been solved. The problem is with the ESC. After trying all the things that sensible to solve it then I suddenly got the idea of try to use different ESC. I use my spare turnigy 60A and magically all problem solved. But I couldn't find any reason behind that. Maybe the ESC voltage to the receiver going crazy and cause the rudder signal to go loco. Maybe..dunno why..
Currently I'm having trouble with both my heli regarding tail bounce problem when doing piro stop. Tail will bounce 2-3 times before stopping. I've tried various gyro setting but still the problem won't go away. I had this problem before with my 401 a very loong time ago but this time both my EP heli had this disease. Huh..3 weeks still no solution..I'm thinking the problem with the gyro. Both heli using PG800 gyro a so called spartan clone paired with align DS520.
This is my current setting on my PG800
GYDIRECT NORM
MID-TRIM 000
L-LIMIT 140
R-LIMIT 150
RPIRGAIN 50
LPIRGAIN 50
RUD-GAIN 100
ACC-EXP 000
DEC-EXP 000
DEADBAND 005
N-RUDEXP 000
A-RUDEXP 000
I've tried reduce the LRPIRGAIN, RUD-GAIN, DEC-EXP, ACC-EXP. Really have no idea what to do. Now waiting for HK401B gyro from Hobbycity to test if the problem comes from gyro.
Update...I just install 401B on both of my problematic heli's and guess what..the problem solved..I think..my test this evening showed that the bounce keep to very minimum (almost none) and the tail lock solid. I felt much confident doing 3D with it compared to my old gyro. Will test out more tomorrow..I'm very happy with it..
Update 13/01
1. Test no 2 on 450. Once my tail servo looses control and piro by itself but luckily I managed to recover and land safely. Dunno what happen either dumb thumb or heavy wind. But then when I tested again everything looks OK. More test require.
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