Helicopter mechanics
with model turbine engine
56
Airspeed-Sensor, order no. 6802
The airspeed sensor is an optional accessory which can be connected to the system, and
consists of a pitot tube and a precision differential pressure sensor. The ECU calculates the
current airspeed of the model from the measured differential pressure and the air temperature.
The airspeed information can be used by the ECU subsequently for various functions:
•
Measuring / storing the maximum and average airspeed.
•
Measuring / storing of the covered distance in km.
Connection diagram for the airspeed sensor:
Airspeed
Sensor
air pressure
(Staudruck)
static pressure
(statischer Druck)
pitot-tube
(Staurohr)
1
1
2
2
flight direction
(Flugrichtung)
ECU connection cable
(Anschlußkabel zur ECU)
The air pressure connections 1 (= air pressure) and 2 (= ambient pressure) are completed using
the air tubes supplied. The length and cross-sectional area of the tubing do not affect the
accuracy of the measurement.
If an Airspeed Sensor is connected to the system, the pilot can make use of expanded ECU
functions:
•
In the "Run" menu the currently measured airspeed ("Airspeed") and the nominal speed
("SetSpeed") can be displayed.
•
In the Min/Max menu the measured maximum ("MaxAirSpd") and calculated average
("AvgAirSpd") airspeeds can be displayed on the screen.
Parameter in „Limits“ menu
Parameter
Explanation
AirSpeed units
Units for the measured airspeed [km/h] or [mph]
Parameter in „Min/Max“ menu
Parameter
Explanation
AvgAirSpeed
Average airspeed in km/h
MaxAirSpeed
Maximum airspeed in km/h
Flight Distance
Covered distance in km
Calibrating the airspeed sensor
The characteristic curve of the differential pressure sensor can be calibrated to obtain maximum
measurement accuracy.
To calibrate the sensor you will need the following additional items:
•
50-60 cm length of silicone hose or similar (any internal diameter)
•
Water
•
Ruler or metre rule
