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Stab:
Elevator Servos: In the BOLT! stab there is no
servo hatch either. The servos are screwed into
the servo ribs in reversed direction. That means,
the servo screws are inserted into the rubber
grommets from the bottom side and the servo
gets screwed in place reversed. Before you do
that, you need to install the metal servo arm (as
short as possible, 1" / 25mm is OK but actually
still too long, 20 mm would be best. However, it
is hard to find that short aluminum servo arms,
so it is to be considered to drill a threaded hole
closer to the center of the servo. Anyway, the
servo arms protrude the bottom skin of the
stab. We only have cut a narrow slot, depending
on your servo and servo arm, you have to widen
and adjust that slot for free movement.
Then install the servo with the hex socket cap
self tapping screws, using a ball end allen key.
Install and adjust the linkage like you did on the
ailerons, stiffen it by using a short piece of the
5x1 mm carbon tube.
Proceed at the opposite side the same way.
As a helpful hint: Use a servo tester and set the
servo arms to exactly vertical at 1500 ms signal,
so you can make sure that you don't have to
use too much centering input on your
transmitter or even remove the servo to change
the arm on the spline - as this could be a quite
annoying undertaking. As a limitation you won't
need more than 30 mm (1 1/4") down elevator
and 35 mm (1 1/2") up elevator deflection at
root, so ideally that should be your +/- 45
degree on the servo arm.
Actually, on the stab that's all what's needed to
be done. You can try to fit it to the fuselage and
define the position for the servo connections,
which could be right and left outside and above
of the front dowels. Locate a spot where you
know you get to with your hand and decide how
long the servo leads need to be. As long as
necessary, as short as possible!
Fin
Rudder Servo: It should be a really strong one, we recommend 35-40 kg torque. Install a 25 mm
metal servo arm, decide for the linkage you want to use and test fit the servo in the cutout.
Align the linkage from the servo arm to the rudder control horn and adjust the size of the slot in
the fin skin. You will have to widen this slot considerably, because the hinge axis is in an angle
and the linkage will move up and down quite a bit. You will also have to grind away some of the
support spar along the tube sleeve. This is no problem because it is below the support rib and the
whole design is extremely overbuilt. Make sure, when the linkage is finalized, that you get a max
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