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Airspeed Calibration Instrument, Luftwaffe Fl22861-3


Airspeed Calibration Instrument, Luftwaffe Fl22861-3


This interesting device appears to be a WWII-era Airspeed Calibration Instrument, likely used to verify accuracy of airspeed indicators, up to 500 km/hr, to be installed in aircraft of the German Luftwaffe.  Likely a bench instrument and not used in flight.

On the rear of the cabinet is a static pressure port, which leads to a bellows inside of the device, which is further connected to the internal mechanical apparatus of the instrument. A lever responds to the differential pressure applied to the device, which then rotates the pointer on the display.  The airspeed indicator in test would probably be located between the pressure source and this test device, and the measurements compared once pressure is applied.

The cabinet design appears to be repurposed from that used by the Fl22861 Altitude Recorder/Barograph, as evidenced by the curved design of the clear display. 

It is a very interesting instrument indeed, and we are fortunate to have it in the collection. The device is clearly out of calibration, and we have not attempted repair. 

Measure ~6.5 inches tall, 4 inches wide, and ~8 inches deep. 

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