UMX FPV Radian Manual

13
EN
We recommend fl ying your aircraft outside in calm
conditions. Always avoid fl ying near houses, trees,
wires and buildings. You should also be careful to
avoid fl ying in areas where there are many people,
such as busy parks, schoolyards or soccer fi elds.
Consult local laws and ordinances before choosing
a location to fl y your aircraft.
Hand Launching
When hand-launching your aircraft alone, hold the
aircraft in one hand and the transmitter in the other.
Apply about 1/2–3/4 throttle. Hold the aircraft on
the underside and throw the aircraft directly into the
wind, angled slightly up (5 to 10 degrees above the
horizon). Climb to check the trim. Once the trim is
adjusted, begin exploring the fl ight envelope of
the aircraft.
Soaring
Your aircraft can ascend on thermals and other
updrafts to prolong its fl ight. There are many ways
to stay aloft with a sailplane, such as ridge lifts and
thermals. A thermal is simply a column of rising
warm air. Once you get your aircraft into the air,
watch your aircraft for a response to thermals. If
the airplane randomly rolls on its own, it is likely
that you only fl ew through the edge of the thermal,
causing one side of the airplane to rise, rather than
the entire airplane. Enter the thermal by turning
your aircraft directly into it, circling to stay in the
center of the thermal. Slow your forward speed by
increasing up elevator trim so that your aircraft is
moving just faster than stall (minimum sink speed).
Make easy banking turns to fi nd the area of highest
lift (the thermal’s core). When you fi nd the core of
lift, tighten your turns to stay near this position.
Sometimes thermals drift downwind. It is best that
you search for thermals upwind, so that you can
follow a thermal downwind if it is
pushed downwind.
With practice, you will fi nd it easier to locate and
anticipate the movement of thermals. Although
thermals cannot be seen, you can see dust, insects
or birds riding an updraft. Air movement of a
thermal may be felt, so movement in an otherwise
calm spot may show you the location of a nearby
thermal. A shift in the wind (in a light breeze) can be
airfl ow into a thermal.
Landing
Land into the wind. Due to the high lifting effi ciency
of the sailplane design, landing requires a large
landing area. While on your downwind leg,
remember that the sailplane glides much better
than other aircraft. You will need to setup for landing
lower and with a more shallow descent than you
may be used to. As you are on approach for landing,
ensure that the model is descending slowly, but also
not accelerating.
Maintain this descent and speed, and, as the model
nears the ground (approximately 6 inches (15 cm)),
slowly apply a small amount of up elevator. Before
the aircraft touches down, always fully decrease
throttle to avoid damage to the propeller, motor, ESC
or other components.
CAUTION: Never catch a fl ying aircraft in your
hands. Doing so could cause personal injury
and damage to the aircraft.
Failure to lower the throttle
stick and trim to the lowest
possible positions during a
crash could result in damage
to the ESC in the receiver
unit, which may require
replacement.
NOTICE: Crash damage
is not covered under the
warranty.
Flying Tips and Repairs
NOTICE: Always
decrease throttle
at propeller
strike.