Fei Bao MB-339 Instruction Manual - page 18
18
Step 16: Weight and Balance
Test fuel the aircraft. Check for leaks, then drain.
Set your CG. For the initial flights, the plane should balance
slightly nose down with the CG on the wing spar, fuel in the UAT
only, with the gear down.
Adjust CG as necessary.
Step 17: Test Flight
Before any test flight, make sure all systems are fully tested on
the ground and there are no known problems.
Try to conduct test flights under ideal weather conditions, at a
flying facility that offers plenty of “outs” in case of problems.
During the first flight, spend the majority of time on slow flight
and approaches. Your primary goal in the first few flights is to
get a good feel for throws, CG and most importantly, the landing
characteristics of the aircraft.
This is a heavy aircraft, so make sure to carry sufficient power to
touchdown to avoid wear and tear on the airframe.
Equipment Installation Photos
Equipment, including fueling tubes, switches, air fill, air gauges and
remote ECU board were all installed in the aft hatch area so as to be
accessible without removing the canopy. Also, the wiring for the
ECU and for the servos were run down opposite sides of the fuselage
to avoid interference. The receiver was mounted to the fuse side
just to the left of the fuel tanks. This is a good location for both
conventional receivers and 2.4 GHZ units, due to the central
location, high mounting point and absence of carbon fiber in the
area. If you are using multiple 2.4 receivers, this general location
allows for additional units both fore and aft. The positioning also
allows for the shortest run of extension wires.
Receiver and ECU batteries were located on either side of the nose
gear former, secured with Velcro straps glued or screwed to the ply
mounts.
Photos 34-37 show some of the installation details.
Photos 34 and 35 – right side – air systems and remote ECU board