Re: I'm new to RC and bought an AXN
Posted: Wed Mar 13, 2013 1:14 am
Hi,
I maidened my AXN this weekend and encountered a few problems.
PROBLEM 1
I used the recommended 2200maH 25C Zippy (180g) battery but with this pushed all the way to the front of the fusilage the CG is not on the wing spar line.
The plane was very twitchy in the air and even after trimming did not handle that well - admittedly there was a bit of wind but the lack of aileron authority was pretty disappointing - even though I have the connector rods on the innermost hole of the horn as per the build instructions.
I've now checked and if a use a 1750mah Rhino (130g) pushed all the way forward in the fuse the CG is pretty much on the spa line. (I'm using a Hobbywing 40A ESC 30g)
Has something changed in the production of the AXN since the build instructions were written - or should I just slide the 2200mah further back towards the tail to get the GC on the spar line ? The problem I see with this is that the power wires from the battery (which I have facing the tail as per the build video) are then inclined to interfere with the ELE and RUD servo arms.
PROBLEM 2
I didn't give this much thought to this during the build but the wing servos (HXT900's) do not sit flat in their positions in the wings - the trailing edge of each servo sits 1mm above the wing surface. This means that the amount of travel of the ailerons is not the same on each wing - to get them to be the same I've set the upper limit to be 75% of max in ER 9x and the max travel of each aileron is then +/- 12mm from the wing. Is 12mm sufficient to get decent aileron authority ?
Any help appreciated.
GRM
I maidened my AXN this weekend and encountered a few problems.
PROBLEM 1
I used the recommended 2200maH 25C Zippy (180g) battery but with this pushed all the way to the front of the fusilage the CG is not on the wing spar line.
The plane was very twitchy in the air and even after trimming did not handle that well - admittedly there was a bit of wind but the lack of aileron authority was pretty disappointing - even though I have the connector rods on the innermost hole of the horn as per the build instructions.
I've now checked and if a use a 1750mah Rhino (130g) pushed all the way forward in the fuse the CG is pretty much on the spa line. (I'm using a Hobbywing 40A ESC 30g)
Has something changed in the production of the AXN since the build instructions were written - or should I just slide the 2200mah further back towards the tail to get the GC on the spar line ? The problem I see with this is that the power wires from the battery (which I have facing the tail as per the build video) are then inclined to interfere with the ELE and RUD servo arms.
PROBLEM 2
I didn't give this much thought to this during the build but the wing servos (HXT900's) do not sit flat in their positions in the wings - the trailing edge of each servo sits 1mm above the wing surface. This means that the amount of travel of the ailerons is not the same on each wing - to get them to be the same I've set the upper limit to be 75% of max in ER 9x and the max travel of each aileron is then +/- 12mm from the wing. Is 12mm sufficient to get decent aileron authority ?
Any help appreciated.
GRM