Electric Agusta's Grade Up
(Updated February 1, 2001)
An Aveox Brushless DC E-motor 1817/3Y and a PA-1 (Futaba's
optical autopilot) are installed!
A brushless DC-motor is maintenance-free. It preserves the same
performance forever.
As for the performance of this motor in LOGO30, see a
report of Mr. Ralf Buxnowitz
(the president of Mikado R/C helicopter, Germany).
The 1817/3Y with cooling fan drives the main rotor
on 30 cell- Nicd batteries.
No friction loss, high efficiency, more compact than brush-motors.
I use a
sensorless controller Kontronik 3SL40-14-32 for this motor in
the governor
mode (mode 4) because of smooth start (smoother than the Aveox
H160).
In mode 4, I do not use any additional channel for the motor
control;
only use the throttle channel. Instead, I set the throttle curve
as constant
above the 1/3 throttle position.
See Aveox1817 vs HV355.
24-teeth pinion gear (gear
ratio=(55/24)X4)) and the mixer of PA-1
For the installation of PA-1, one must convert the electric mixing
swash mode to
the mechanical mixing swash mode. The
compactness of 1817 admits this conversion.
Look at the light sensor of PA-1 (Futaba's optical
autopilot)!
This sensor catches the differences
of the light strength in 4 horizontal directions. Then the mixer
controls the ailron and the elevator servos with the ailron and
elevator outputs from the receiver.
The strength of this autopilot is inverse-proportional to the
movements of the ailron and elevator
sticks by the pilot. To get a good flight stability, one
must adjust the inclination of the light sensor
and the lengths of servo-horns for ailron and elevator.
According to Ms. Rosemarie Knechtel (the secretary
of VARIO HELI) the
new optical autopilot
systems by VARIO in 2000 are for CCPM swash control helicopters;
easy to install and adjust.
See VARIO's
news page. You can see a photo of a pilot releasing his hands
from the transmitter.
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