Thowt
F3K
EN
Obtained
weight
wing
130
g
fuse
30
g
tube
15
g
rudder 7
g
elevator
7
g
seat under the elevator
1 g
General instruction
The core of the wing, elevator and rudder are made from extruded
polystyrene. Therefore use glue, which does not corrupt this material. Handle
the wing with care. Given its construction related to the requirement for the
lowest weight possible, it can be damaged easily, especially dented.
Assembly of the wing
First make slots for servos, placed into laminated reinforcements near the center of the wing (poorly visible semicircle on the
surface of the wing). Servos can be put both before and behind the girder. When cutting out the slots, be careful not to corrupt
the girders. Then make channels for the cables with a needle rasp file. Then make one bigger hole in the middle of the wing to
bring out the cable for the servos. I recommend wrapping the servos with tape and, after setting the neutral of ailerons, gluing
in the prepared slots with Purex. For rods use 1mm steel wire ended with a “Z” bend. The throwing pin should be glued in the slot
made in the carbon reinforcement at the end of the wing and laminated with a thin glass fabric 1x1 cm big. Drill the spots in the
middle of the wing made for the mounting screws so that the screws are in line with the slots in the trunk.
The tail
Shorten the tail tube to the appropriate length from the narrower side.
RUDDER
In the rudder cut out 2 cm long notches so that it can be tucked in the trunk and then glue with 5min epoxide.
Laminate the whole spot from both sides with a 15x45 mm big stripe of 50 g/m fabric. Turn the rudder stop to
the rudder and glue in a spring from 0,3mm U shaped 20x50x20 mm big steel string – one end of the string
should be glued into the rudder, the other into the rudder stop. Glue the ends of the string with 5min epoxide.
Turn the rudder stop back into straight position and glue in it the operating lever.
ELEVATOR
Glue the seat under the elevator with 5min epoxide so that its stagnating edge is 90 mm off the end of the
trunk. Drill in the elevator Ø 3mm hole for a screw and Ø 2mm hole for centring pin. Turn the elevator stop to
the elevator and glue in a spring from 0,3mm U shaped 20x50x20 mm big steel string – one end of the string
should be glued into the elevator, the other into the elevator stop. Glue the ends of the string with 5min
epoxide. Turn the elevator stop back into straight position and glue in it the operating lever. After test flying
and setting of the exact approach angle of the elevator glue its fixing screw into the seat.
Trunk mounting
The servo plate should be glued as forward as possible in the trunk so that the Rx battery and receiver can fit in front of it. As Rx
battery use 4 pieces of NiCd 2/3 AAA cells with capacity about 350 mAh. I recommend using Diamond D47 rudder and elevator
servos and Diamond D60 for the wings. The receiver should not weight more than 8g.
Set-up
I recommend placing the center of gravity of the model 85 to 89mm from the approach angle of the wing a trim it according
to the behavior of the model when flying. After throwing the model should be mildly ascending. If it flies straight without
ascending mildly, it is too light on the front and it is necessary to trim it. Conversely, if it is ascending too steeply, the center of
gravity is too much in the front and it is necessary to remove some weight from the front of the trunk. The AG profile used in the
model allows to change the neutral position of ailerons and change the way the model flies and to use the ailerons as brakes
at the same time.
I recommend to set-up these phases of the flight:
1) throw in strong wind: ailerons 1mm upwards,
2) slow thermal soaring: ailerons 2mm downwards.
I recommend setting the throttle so that it is used for the operation of the ailerons in the function of brakes. In case of full flap
angle of the brakes, it is necessary to compensate the flight of the model by a clampdown of the elevator by 8mm (by mix
brakes – elevator).
MANUAL
1
