Kavan F3RES, Instruction Manual

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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. The push
rod tubes go all the way through the tail boom tube.
(Fig. 37)
◊
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 V-tail
symmetrically to the trailing edge of the wing when looking from behind.
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 ruddervator 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.
◊ Solder the M2 brass threaded couplers to one end of the piano wire
pushrods, attach the M2 ball links and fasten them to the ruddervator
horns.
(Fig. 1) (Fig. 2)
◊
Fit the V-tail to the fuselage; insert the control horns into the rudderva-
tors – 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 servo arms. Check once again and
only then cyano the control horns in place. Do not forget to glue the end
of the push rod tubes 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
W29 holders on the airbrake frames. Please check the polarity of mag-
nets first – they must attract each other.
(Fig. 30) (Fig. 31)
◊
Refer to the Det. C on the building plan during the final airbrake servo
installation. Link the servo horn and the W36 torsion bar lever with two
ball links joined together with an M2 threaded rod (saw off the head of
the supplied M2x10 mm screw).
◊
Once you check the servo can move freely within the required range, cya-
no the
W36 lever to the W37 carbon torsion bar. (Fig. 39)
◊ With your radio on, set the airbrake servo to the “airbrake fully extended”