recommended CG on my model was right in the middle of the 3
1/4" to 4" back from the leading edge specified in
the manual, perfect for the test flights.
Control rates were setup per the manual as follows.
Ailerons low rate 1" up and down
Ailerons high rate 3" up and down
Elevator low rate 1 " up and down
Elevator high rate 3 1/2" up and down
Rudder low rate 2" left and right
Rudder high rate 4 1/2" left and right
Eratix did not take much runway at all before it was airborne
and climbing straight up. After a few circuits around the
field I felt the low rates were too low for me so I flew around
on high rates the rest of the flight, that is how comfortable
I was with this plane right from the start. I used 35% Expo
in the DX7 radio and it felt perfect.
first few flights were done with a 13x6.5 APC E-prop but I
did not like the way the plane hovered, the prop would loose
its grip and seem to "cavitate" in the air and the
plane would sink. I switched to a 14x7 prop and it pulled
60 amps at full throttle which was the speed controls limit,
I knew I wouldn't be at full throttle much anyway.
14x7 was a perfect match as it would hover just fine and would
rocket out of a hover.
Eratix will knife edge with hardly any rudder input and a
knife edge loop is one of its best maneuvers. They can be
done very big or small and it has no tendency to snap out
at the bottom of it. About half throttle is all that is really
needed to do them as it is so overpowered.
Hovering is no problem and it seems to just hang there, Torque
rolls were very slow and I could not get it to spin around
very quick, using some aileron to get them started seemed
to help but they were still pretty slow.
Upright Harriers had a little bit of wing rock in the video,
but I moved my CG back to the 4" mark which made them
lock in better, of course inverted is better than upright.
A little bit of spoileron mixing also helped with the wing
rock but isn't absolutely needed.
Blenders were very good but would not flatten out at the bottom
with the middle CG range, again moving it back helped them
to flatten out at the bottom. A little power is needed to
get the down line moving fast enough as the plane is so light
and takes too long to build up any speed without power.
the thick airfoil the Eratix is a floater and will almost
fly at a fast walking pace without tip stalling, inverted
or upright doesn't make a difference. It can handle some wind
but it is not as fun to fly as on a calm day. Its so light
it can be blown around a bit. It is not a fast plane and is
not designed to be a fast plane.
the 3300 mah pack I get about 8-10 minutes of flight time,
after landing I noticed the motor was running a little hot
at 140 degrees so I opened up the bottom of the cowl to allow
more airflow. Balsa wood baffles inside the openings could
also be made so the air blows directly over the motor.
E-flite 60 amp Pro really works as advertised and there is
no need for a separate BEC or receiver pack which saves weight.
The recommended setup is a perfect match for the airframe
and there is no need to deviate from it like there can be
on some other models.
See the E-flite Eratix in action!