-
electronic center of the servos should o
ff
set (~30% out) at control surface neutral
position so that the servo allows 2 times as much throw towards the CROW direction
than opposite.
-
Aileron di
ff
erential with this geometry will automatically result in approx. 75% down and
100% up (25% di
ff
).
-
For Butterfly the flap down deflection should be 60-70 mm (measured at the root).
Aileron up accordingly approx. 25-30 mm (measured at tip). These settings still allow
full aileron movement and give you enough aileron authority during landing at full
butterfly.
The angles and lengths of the servo arms are crucial because
only
when this geometry is
set right, the necessary butterfly (Crow) deflections can be reached! Be warned, butterfly
is VERY powerful at the settings described above, thus a proportional activation is a must
(not only put on a switch).
2) The Fuselage
Also the fuselage of the CARF-Models KOBUZ-3 is manufactured from all carbon fibre.
The strength and sti
ff
ness is unmatched, especially because of its large cross section all
the way to the tail. Only the front area under the canopy glass is a patch of fiberglass only,
that is because in this area the RC equipment is placed and we do not want the carbon to
shield the RC signals.
The canopy is readily built, attached to the frame and the frame is attached to the
fuselage with pins and a canopy release mechanism. It’s all prefabricated and functional
when you take the plane out of the box. A cockpit tub is also included.
The formers for the retractable landing gear are installed, aligned and the gear itself is
soft mounted, it is to be bolted in with 2 bolts from the front, and two rubber stando
ff
s in
the rear. The retract servo is to be installed to the side of the gear frame, a simple
aluminum bracket is included. Install 2 springs to pull the doors shut when the gear is
retracted.
The rudder servo is to be mounted right behind the retract. The formers are glued in. A
Pull Pull cable system is installed to move the rudder, the slots for the cables are already
pre-drilled. Don’t change any hardware, use what is provided with the kit. All included
hardware has been tested and has a reason which you might not immediately recognize.
A tow release is pre-installed (except on a handful of very first kits) and if to be used, a
servo can be mounted flat in the bottom of the fuselage. This tow release is simple and
super reliable.
3) The Stab
The stab is all carbon fibre, too. The elevators are skin hinged as well, thy are cut in the
middle because the geometry of the hinge line would not allow to leave it one piece. Still,
both elevators are joined by a single ball link and the elevator servo is installed in the rear
of the fuselage. The linkage can be removed when the stab is removed for transport.
