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Maximum permissible speeds:
for Ord.No. 138/92: 7500 rpm
for Ord.No. 92/90, 92/95,
93/90, 93/93: 9500 rpm
for Ord.No. 93/45: 11000 rpm
for Ord.No. 93/88: 11500 rpm
BASic inForMAtion
The necessary speed for the corresponding model is determined by the mechanical design and our recommendations.
Higher speeds are not required if the correct settings are made and the recommended components are used.
They put unnecessary strain on the drive power and promote wear! In addition, the actuating forces on the couplings are
considerably higher, therefore, please observe the maximum permissible speeds (see above).
Do not use any mechanics where the tail rotor rotates with autorotation!
The power requirement of the Fenestron in the model is considerably higher than that of a normal tail rotor.
In autorotation flight the main rotor speed is reduced accordingly when the Fenestron is rotating, thus reducing the
rotational energy available to the main rotor for landing.
ServoS
Use servos with an actuating force (not holding force!) of at least 12 kg (same type as the swashplate servos - not high
speed) with a suitably reinforced servo arm for actuation. The linkage is attached at a distance of 14 - 17 mm from the
axis of rotation of the servo. Only the outer hole of the bellcrank is used on the Fenestron. We recommend to use the
reinforced plate on the bellcrank (Ord.No. 342/96).
Gyro
In the setup of the flybarless system, select a gyro type that is suitable for normal or scale flight.
With the Bavarian Demon for example „GY 401". Do not reduce servo travel and do not use exponential for the time being.
If you have any doubts about the performance, first check the proper function of the Fenestron with a simple, separate
gyro system e.g. Futaba GY 401. Some gyro systems from the 3D range dampen the tail performance so strongly that a
function of the Fenestron is not guaranteed.
linKAGe
Only direct straight connections between the pivot points with carbon fibre control rod Ord.No. 21/4 or 21/5 can be used.
BASic SettinGS oF the trAnSMitter
Important: Do not reduce servo travel for tail rotor.
- Set gyro sensitivity to approx. 60 - 70 %.
- Leave dual rate at 100 % and Expo at 0 %.
- Adjust the pitch tail rotor mixer as shown in the sketch below.
Do not use Heading Lock mode at the beginning.
BASic MechAnicAl SettinGS
- When the transmitter stick is in pitch center position, the servo arm is at right angles to the servo housing.
- When the transmitter stick is at its minimum pitch, the angle of attack is zero.
Maximum control deflection
against torque: approx. 40-50°
Setup FeneStron
Servos:
Actuating force min. 12 kg
Reinforced servo arm
The linkage is connected to the servo
control arm at a distance of 14-17
mm from the axis of rotation.
Gyro:
do not use special 3D gyros or setups
linkage:
only direct straight connections with CFRP control rod
Transmitter:
60-70% sensitivity, Dual 100% Expo 0%
Maximum control deflection with
the torque: approx. 10°
Angle of attack in hovering
position: approx. 2025°
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