Original Item. Only One Available. This is an authentic Dreieckrechner Flight Computer, Model DR2, Fl.23825 as used by pilots and navigators of the German Luftwaffe during WWII. This is the first example we have ever offered!

It is essentially a two-sided slide rule. Side one is used to correct the course of flight due to wind direction: by setting the black arrow to the desired course and rotating the white inner dial to the wind direction in black, then correcting the course by turning the aircraft to the corresponding red angl

Original Item. Only One Available. This is an authentic Dreieckrechner Flight Computer, Model DR2, Fl.23825-1 as used by pilots and navigators of the German Luftwaffe during WWII. This is only the second example we have ever offered, and this one comes with a great Luftwaffe map of Germany.

It is essentially a two-sided slide rule. Side one is used to correct the course of flight due to wind direction: by setting the black arrow to the desired course and rotating the white inner dial to the wind direction in black, then correcting the course by turning the aircraft to the corresponding red angle. We believe that side two was used to determine the impact of wind direction and speed upon aircraft flight time by adjusting the outer and inner white dials along the black dial.

This 5 7/8-inch plastic device, manufactured in Hamburg-Altona in July 1943, is in very good condition given its age. The dials still function as intended and all markings are still present.

The map measures roughly 27½ x 24½” and is dated 1942.

A great piece of early aviation technology and history with a great map, ready for further research and display!

e. We believe that side two was used to determine the impact of wind direction and speed upon aircraft flight time by adjusting the outer and inner white dials along the black dial.

This 5 7/8-inch plastic device, manufactured in Hamburg-Altona in February 1941, is in very good condition given its age. The dials still function as intended and all markings are still present. A great piece of early aviation technology and history ready for further research and display! This is the first we have ever offered, so don’t miss out.