EFL5550 E-flite Radian XL 2.6m Manual

EN
During your first flight, trim the aircraft for level flight in a glide (power
off). Make small trim adjustments with your transmitter’s trim switches to
straighten the aircraft’s flight path.
After adjusting trim do not touch the control sticks for 3 seconds. This allows
the receiver to learn the correct settings to optimize AS3X performance.
Failure to do so could affect flight performance.
It is normal for the aircraft to climb under power when it’s trimmed properly for
maximum glide performance.
Flying Tips and Repairs
In Flight Trimming
Consult local laws and ordinances before choosing a flying location.
Range Check your Radio System
Before you fly, range check the radio system. Refer to your specific transmitter
instruction manual for range test information.
Oscillation
Once the AS3X system is active (after advancing the throttle for the first time),
you will normally see the control surfaces react to aircraft movement.
In some flight conditions you may see oscillation (the aircraft rocks back and
forth on one axis due to overcontrol). If oscillation occurs, refer to the Trouble-
shooting Guide for more information.
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 a safe altitude and check the trim. Once the trim is adjusted,
begin exploring the flight envelope of the aircraft.
Soaring
Your aircraft can ascend on thermals and other updrafts to prolong its flight
with the motor off. 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 flew 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
turns to find the area of highest lift (the thermal’s core).
When you find 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 find 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 airflow into a thermal.
WARNING: Do not dive your Radian for prolong periods of time. Doing
so could cause the Radian to gain too much speed, and overstress of
the aircraft is possible.
Spoilers/Air Brakes
The spoiler (air brake) on this aircraft gives you increased drag without the ad-
ditional lift of flaps. The spoilers (only on the upper surface of the wing) “spoil”
or decrease lift for sections of the wing and increase drag. This allows you to
descend at a steeper rate and land in smaller areas without gaining airspeed
and allows you to bleed off energy more quickly.
IMPORTANT: This aircraft has been designed so that deploying the spoilers
does not affect any other control surface. On your transmitter, no mixes are
required from the spoilers to other control surfaces.
Landing
Land into the wind. Due to the high lifting efficiency of the sailplane design,
landing requires a large landing area clear of trees, buildings and cars. While
on your downwind leg, remember that the sailplane glides much better than
other aircraft.
You may need to setup for landing lower and with a more shallow decent than
you may be used to. As you are on approach for landing, ensure that the model
is descending slowly, but also not accelerating. If the model is accelerating, it
is likely that you will overshoot your projected landing area. Deploy the spoilers
during landing to help the sailplane descend faster.
Maintain this descent and speed, and, as the model nears the ground (ap-
proximately 6 inches (15 cm)), slowly apply a small amount of up elevator. The
model should level out and fly parallel to the ground, decelerating further. Be
sure the model does not climb. As it decelerates, keep flying the model parallel
to the ground until it comes to rest gently on its belly.
NOTICE: If a crash is imminent, reduce the throttle
fully. Failure to do so could result in extra damage
to the airframe, as well as damage to the ESC and
motor.
NOTICE: Crash damage is not covered under
warranty.
Repairs
Repair this aircraft using CA (cyanoacrylate adhesive)
glue or clear tape.
When parts are not repairable, see the Replacement
Parts List for ordering by item number.
For a listing of all replacement and optional parts, refer to the list at the back of
this manual.
NOTICE: Use of CA accelerant on your aircraft can damage paint. DO NOT
handle the aircraft until accelerant fully dries.
NOTICE: When you are finished flying, never leave the aircraft in direct sunlight
or in a hot, enclosed area such as a car. Doing so can damage the foam.
WARNING:
Always decrease
throttle at propeller
strike.
3 Seconds
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