Pushrod Installation; Servo Installation - Kavan MIRAI Bauanleitung

◊ Glue the W21 airbrake frame to the upper side of the wing; insert and
glue the airbrake bay reinforcement plate W20 (balsa 1.5 mm) into W5,
W7 and W8 ribs. Cyano the W34 fibreglass bushings for the airbrake tor-
sion bar onto W3/W4 and W7 ribs. Insert the 3 mm carbon torsion bar
W37 into the bushings. Do not forget to slide the W36 control horn in
the centre. Do not glue yet! The control horn and airbrake levers are to
be glued in place once the wing is covered and the servo and airbrakes
fitter (refer to Det. C).
◊ Glue the W29 magnet holders to the bottom side of W21 airbrake fra-
mes. The pairs of W33 magnets will be epoxied into the holders W29 and
airbrakes W22 and W23 only after the wing is covered.
◊ Glue the 1.5 mm balsa W28 upper centre sheeting (supplied in 2 pieces)
and the bottom W19 sheeting in place over the W3 ribs.
◊ Do not glue the W25 airbrake servo hatch; it will remain removable for
easy access to the servo. You can secure it using e.g. small wood screw
(not supplied in the kit) to the 5 mm plywood holders W32. Do not forget
to cut the opening for the wing fixing bolt into the balsa sheeting.
◊ Epoxy the W1 central riblet with the wing alignment pin sandwiched
between two W2 riblets in place. Glue the 1.5 mm front bottom sheeting
W18 between the W3/W4 ribs.
◊ Sand to fit and glue the 2.5 mm balsa gussets W38 in place. (Fig. 27-31)
◊ Fine sand the entire wing centre section (incl. the airbrake).
Wing Outer Panels (Fig. 32-36)
◊ The wing outer panels are to be constructed in the same manner as the
wing centre section; the main difference is that the inner part and the
outer winglet are built as one part on a flat surface. Once the structure is
finished, you will cut it between the end/root ribs; then bevel to obtain
the correct dihedral and glue together.
◊ Glue together both two wing outer panels over the building plan protec-
ted with a sheet of thin clear plastic film (remember – you are building
left and right wing panels!). Please note the inner spars are made of spru-
ce sticks P33 resp. P23, whilst the winglet spars are made of balsa sticks
(P34 and P31).
◊ Glue the top D-box sheeting P27 and P28 in the same manner as the
wing centre sheeting W24.
◊ Sand the wing tip flat, glue the P17 winglet fairing in place and bevel it
to the required 35°angle. Insert the P29 plywood joiner and sand the P18
wing tip to fit. Once satisfied glue the joiner and wing tip in place.
◊ Sand to fit and glue the 2.5 mm balsa gussets P33 and the P34 diagonal
braces made of 5x3 mm spruce stick in place.
◊ Cut off the outer winglets between the end ribs P10 and P11; bevel the
P11 ribs using the supplied 7° dihedral jig. Epoxy the wing panels and
winglets together.
◊ Bevel the P2 root ribs of the wing outer panels using the supplied 7° di-
hedral jig. Trial fit the P32 carbon wing joiner into the respective bays;
there should be a tight fit, no play. If there is a significant play, put some
epoxy to appropriate area of the joiner and sand as necessary once the
glue hardens.
◊ Glue the 3 mm liteply P1 root ribs with 3 mm beech alignment pins P30
in place.
◊ Fine sand the entire wing outer panels.
Covering
◊ Thoroughly sand the surface of all parts with No. 360-400 sandpaper and
carefully vacuum all the dust (the iron-on film does not stick well to a
dusty surface; the dust also contains hard grains released off the sand-
paper capable to ruin the smooth coating of your sealing iron quickly).
◊ Use as light iron-on film as you can get (transparent Oracover, Oralite etc.
– not supplied in the kit). Follow the instruction manual supplied with
the covering film of your choice please.
Hinging the Control Surfaces
◊ Use strips of a high quality hinging tape (available in hobby shops) or stri-
ps of the same iron-on film you used for the covering. Remember to apply
the tape with the control surface deflected to the limit in order to get free
movement of the particular control surface.

Pushrod Installation

◊ Tack glue the pushrod tubes to the 1.5 mm balsa pushrod tube holder with
three plywood formers supplied in the kit. Do not shorten the tubes yet –
they will have to go all the way into the front part of the fuselage. (Fig. 37)
◊ The elevator push rod tube goes all the way through the tail boom tube;
carefully drill and cut the exit opening for the rudder push rod tube in the
tail boom. (Fig. 38)
◊ Insert the balsa holder with push rod tubes into the tail boom; align with
the front part of the fuselage. Once satisfied tack glue the holder to the
tail boom tube.
Tail Boom Installation
◊ Attach the wing centre section to the fuselage and secure with the M5
nylon bolt. Attach and secure the tail surfaces to the tail boom with the
push rod tubes installed in their holder (the holder prevents the tubes
from getting loose and keeps any unwanted play in the elevator and
rudder linkage next to zero). Slide the tail boom onto the holder on the
fuselage front part. Thread the push rod tubes through the holes in F10,
F8 and F7 formers.
◊ Check that the fuselage is straight looking from above; align the wing and
the horizontal tailplane with their trailing edges parallel. Once satisfied
use 30min epoxy to secure the tail boom in place. Double check the correct
alignment of the wing, fuselage and tailplane before the glue hardens.

Servo Installation

Rudder and Elevator Servos Installation
◊ The rudder and elevator servos are to be installed into their servo tray
F23 under the F16 hatch (glider) or into the E3 servo tray under the wing
(electric version). Cyano the push rod tubes into the fuselage formers; you
can use the supplied fibreglass pushrod holders (Bag 1) to secure the ends
of the tubes.
◊ Solder the M2 brass threaded couplers to one end of the piano wire
pushrods and attach the M2 ball links.
◊ Alternatively you can use a closed loop of a Kevlar thread (not supplied in
the kit) to hook the rudder – it might save some weight. In that case you
will need to install just one pushrod for the elevator.
◊ Fit the tail surfaces to the fuselage; insert the control horns into the rud-
der and elevator – do not glue yet. Set the servos in neutral position with
your radio on and mark the correct length of the push rod wires. Make a
"Z" bend on the end of the pushrod and fit it to the rudder and elevator
horns. Check once again and only then cyano the control horns in place.
Do not forget to glue the end of the elevator push rod tube to the fuselage.
Spoiler Servo Installation
◊ The spoiler servo is to be installed using a strip of double sided foam tape
(not supplied in the kit) to the W28 balsa sheeting. First, apply thinned
epoxy or thin cyano to the inner surface of the W28 sheeting in order to
be sure the double sided foam tape will stick. Reinforce the inner surface
of the W22 and W23 airbrakes in the same manner.
◊ Epoxy the W33 magnets into the holes in W22 and W23 airbrakes and
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