Kavan MIRAI V, Instruction Manual, Page: 6 / 20

6
FLYING
Be sure you are using fully charged batteries. Now (and before any further
flight again) check correct function of whole radio equipment, motor and
moving of control surfaces. Be sure any part of flight equipment cannot
move during flight. We strongly recommend making a range check (see
your radio instruction manual for details).
The first flight: Wait for a calm day. Fly only on a safe site as a RC club flying
field. Glider will be very happy on your favourite slope on a calm day. The
very light lift will allow perfect fine trimming out.
Glider: Switch your transmitter and then the receiver on and check all the
working systems one more. Facing INTO the wind hold your transmitter in
one hand; grip the model in the other hand near the centre of gravity. Hold
it at head level and give the model a fairly powerful push exactly into wind;
wings level, nose slightly down. Your model should now glide in a long,
flat and straight path without needing any help from you. Use the controls
gently if necessary, and adjust the trim tabs until your MIRAI glides above
described way. Now check the position of control surfaces; set length of
pushrods to bring back trim tabs on your transmitter to central position
if necessary (we strongly recommend doing it in any way). Check again
gliding of your MIRAI.
Now you are ready to make your first bungee launch. Always use a bungee
set appropriate to the size (100-150 m) and weight of your model!
Electric version: Switch your transmitter and then the receiver on and
check all the working systems once again. Launch your MIRAI with throttle
fully open INTO the wind. During climbing be gentle on the controls; try to
keep the model flying into the wind until you have about 100-150 metres
of altitude. Climb slowly - too steep climbing may cause the model will
stall and fall to the ground. You are at 150 metres - this is time to trim out
your MIRAI at full power. After everything is OK - it means the model at
approx. 50-60% of full throttle flies straight without turning, descending
or ascending (if your MIRAI already tends to ascend you will have to
increase motor down thrust), turn the motor off and test MIRAI’s gliding
characteristics.
Keep your MIRAI into the wind and observe its flight. If turns without power
right (although under power it kept the straight direction) it will be ne-
cessary to increase motor right side thrust and vice versa. If descends too
much without power (although under power it kept the level flight) you
will have to increase motor down thrust (assuming the centre of gravity is
correct! - check it after landing).
Final Fine Tuning: During next flights trim out your MIRAI to find
optimal setting - safe climbing and good gliding - it is a compromise, of
course. You might find useful programming a spoiler->elevator mix (if
your radio allows) that will eliminate the nose pitching when the spoiler
is deployed. In general the CG position should be located between 78-82
mm behind the wing leading edge. By moving the CG back you get better
gliding performance whilst reducing the stability. It makes your model
more sensitive on controls and increases the model reaction on thermal.
The back CG position makes the model more difficult to fly and requires
more attention from you, while a nose heavy model is easier to fly but you
will lack the performance. We recommend starting with the CG at 78 mm
behind the leading edge. Beyond 82 mm the increasing lack of stability
prevails over the gain of gliding performance.
On windy days, you can improve the penetration of the glider version
putting additional ballast into the
F20 ballast tube.
Enjoy your new MIRAI, have a ball!
position. One at a time, set the W22 and W23 airbrakes in the fully exten-
ded position (-24 mm), push the corresponding lever W35 to the airbrake
and secure with a small drop of cyano to the
W37
torsion bar. Take care
the position of both two airbrakes was exactly the same! Once satisfied,
secure the joints of
W35 and W36 levers with the W37 torsion bar using
a sparse amount of epoxy.
◊ Finally, cut an opening into the W25 hatch to allow free movement of the
airbrake servo arm (if necessary) and secure it to the
W32
holders.
(Fig. 40)
Wing Root Ribs
◊ Glue the pairs of W31 magnets using 5min epoxy into the openings in
W6 and P1 ribs. Please check the polarity of magnets first – they must
attract each other.
Towhook (Glider)
◊
Install the towhook to the pre-drilled holes in the F15 plate.
◊
Keep the recommender CG position 78 – 82 mm behind the wing leading
edge.
◊ Set the towhook 10 mm in front the CG for the first flight.
◊
You have to loose the front screw in order to move the towhook.
Power System Installation (Electric Version)
◊ Fit your motor using appropriate screws to the firewall; secure the ESC
and power pack using Velcro tape into the cockpit. With your RC set on
test whether the motor rotates in the correct direction (counter clockwi-
se when looking from the front) If it not the case, change the setting of
your ESC or swap any two of the three cables between the motor and ESC.
Fit 30 mm spinner with blades corresponding to your motor and battery
set-up.
Recommended Control Surface Throw, CG Position
◊
CG Position: 78-82 mm
◊
Rudder: ±13 mm
◊ Elevator: ±13 mm
◊
Spoiler: -24 mm
◊ Brake->Elevator mix: -2 mm elevator at full airbrake