HITEC StuntMaster - Manual (Page 7)

Seite 14
RUDDER:
Here there are two options: either a pushrod or pull-cables.
Advantages of the pushrod linkage:
• Easier to install
• Less sensitive to temperature fl uctuations
• Easier to adjust
Advantages of the pull-cable linkage:
• More effi cient transfer of servo power
• Lighter
• Reduced lost motion (slop)
In the fi nal analysis both methods work well, and the choice
is really just a matter of personal taste. All the parts for both
versions are included in the kit, so either can be installed.
RUDDER option: pushrod linkage (Fig. 16):
Repeat the general procedure described for the elevator and
aileron linkages: connect the rudder pushrod 20 (approx.
1.3 x 620 mm) to the outer hole of the rudder horn, and
the second hole from the outside of the servo output arm.
Secure the clevises as already described, and tighten the
clamping screws fi rmly.
RUDDER option: pull-cable option (Figs. 17 - 22):
Use a clean, sharp balsa knife to cut off the plastic supports
and raised foam sections on the right-hand side of the
fuselage, leaving them fl ush with the foam surface. Thread
the pull-cable 21 through the outer hole in the rudder horn,
and tie a knot at a point about 8 mm forward of the horn.
Apply a drop of Zacki to the knot to prevent it working loose.
Route the cable forward as far as the servo output lever,
and cut it off leaving an excess of about 10 cm. Referring
to Fig. 21, thread it through the outer hole (or second hole
from the outside) of the servo output lever. Set the servo
to centre from the transmitter, and tape the rudder in the
centre position.
Fit the screw 22 (1.4 x 6 mm) and the washer 23 (5 mm Ø)
in the third hole from the outside of the output lever, tighten
it about half-way, then tie the cable round it. Fix the cable
to the screw with a little Zacki. If you now carefully tighten
the screw further, the cable will be placed under tension.
Repeat the procedure with the other side, and adjust the
pull-cable linkage so that the rudder is exactly central when
the servo output lever is at neutral.
8. Installing the motor and propeller (Figs. 23 - 26):
Slip the speed controller through the motor bulkhead, and
permanently fi x the motor in place using the retaining screws
25 (2 x 5 mm). Attach the propeller 14 to the motor using
the propeller adapter ring 15. Glue the locating pin 12 in
the propeller with a little Zacki, then add the spinner, again
using a little Zacki or contact cement.
9. Installing the receiver and fl ight battery
(Figs. 27 & 28):
Connect all the servos to the receiver in the sequence stated
in your RC system instructions, then push the receiver into
the nose compartment as shown in Fig. 27. Install the fl ight
pack in the forward position.
10. Balancing (Figs. 29 & 30):
Push the battery hatch into place, and balance the model
on your fi ngertips: the correct Centre of Gravity position
is 95 - 105 mm, measured from the wing leading edge at
the root.
11. Recommended control surface travels
for the classic aerobatic schedule:
Rudder: 80 mm right / left, 50% EXPO
Elevator: 40 mm up, 40 mm down, 40%
EXPO
Ailerons:
35 mm up, 35 mm down, 40%
EXPO
Mixer (linear): 2% aileron to rudder, opposite travel
ài.e.: ailerons defl ect left by 2%
at full right-rudder
For 3D aerobatics:
Rudder: 110 mm right / left, 60% EXPO
Elevator: As much as possible up / down,
60% EXPO
Ailerons:
95 mm up / 75 mm down, 60%
EXPO
Mixer (linear): 5% aileron to rudder opposite travel
ài.e.: ailerons defl ect left by 5%
at full right-rudder