Swiss Air-Data Blog

ADP-5.5 RS-485 Multidrop Feature

03, Apr Simtec Buergel AG

The standard ADP-5.5 multihole air data boom has a full-duplex RS-485 data interface. RS-485 enables the configuration of multidrop communications links. Furthermore it uses a differential balanced line pair (like RS-422 and ARINC-429), is very immune to interference and can span large...

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Wind-Tunnel Turbulence

18, Sep Simtec Buergel AG

Last Monday we performed turbulence measurements in our new 22kW open-jet wind-tunnel at the Simtec facility (see also New Wind-Tunnel.

The turbulence level is a very important parameter in wind-tunnel technique since it indicates the degree to which experiments in different tunnels can be...

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There are a couple of manufacturers of pitot-static probes, temperature sensors, smart probes and air data computers on the market. How can you be sure to make a good choice? What is important? How about the do-it-yourself approach?

Following some statements and recommendations based on our...

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At the time our new HPS-1 Heated Pitot-Static Probe is thoroughly tested in our wind-tunnel. We use an IR-camera to make sure that even at high airspeed and high angle of attack the tip is heated uniformly. Furthermore we measure the power as a function of airspeed and check heater-control...

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PSS-8 OAT-Sensor Placement

09, Mar Simtec Buergel AG

There are two important effects if you measure temperature on an aircraft:

  1. At low airspeed, when the heat exchange between the air and the temperature sensor is low, the temperature error is dominated by radiation (e.g. sun heating up the sensor) and the heat transfer between the body of the...

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