The Kobuz-3 will require approx. 1 kg of lead in the nose. Only if an EDF is installed, this
lead can be laminated and replaced by large battery packs.
A note for the first flight: If a turbine or EDF is used to take o
ff
from a runway, or even
from grass, you will notice that the plane tends to dive with its nose into the runway when
throttling up suddenly. Therefore you hold full elevator up and open the throttle to
50-60%, then accelerate until you feel that you have elevator authority. Only then you
should open th throttle 100% and lift o
ff
.
We recommend to use 3 flight modes, if a turbine or EDF is installed.
1. powered flight (engine active)
2. gliding (engine inactive)
3. landing (crow/butterfly active)
The above 3 flight modes allow to have both engine and butterfly on your throttle stick,
whereas in the 2nd mode (gliding) the throttle stick is inhibited. You can also program the
retractable engine mount to be permanently retracted in this flight mode. For EDF, this
can happen immediately, for turbine, you should program a time delay of 20-30 seconds
before the engine retracts for su
ffi
cient cooling (or activate a sequence in your TX). Crow/
Butterfly is only active in the landing mode, so you can make sure your throttle stick is
fully forward before you switch to the landing mode (crow o
ff
). From there, you can pull
the throttle stick back for more crow to be applied.
That way you only have to operate one 3 pos flight mode switch and have everything
taken care of.
Your retractable landing gear is switched separately.
You might add a 2% mix of up elevator in the “powered flight” mode to your throttle stick
position, because the plane tends to push on its nose ever so slightly at full throttle,
whereas when the engine is switched o
ff
or at idle, this e
ff
ect isn’t felt anymore. Thus a
little mix from throttle to up elev makes sense, but only in flight mode 1 (powered flight)
Now we wish you a lot of fun with this powerhouse of an aerobatic glider.
Your CARF-Team!
PS: See photo pages attached to this manual. Some of the photos might be taken from
prototype construction and could be confusing. So, please use common sense and some
level of freedom to follow the suggestions in the photos. We will replace or add photos as
new ones become available.
