WW2 RAF / RAAF Course and Speed Calculator Mk2A

Price: NZ$190.76

Code: BH67

Course and Speed Calculator MkIIA made by stanley Manufacturin Co Ltd In good condition for its age no breaks to acrylic parts of this device.

Once meteorlogical services began to supply wind speed and direction for pilots it was possible to work out ground speed and desired compass heading on the ‘triangle of forces’ principle. The Course and Speed Calculator allowed the navigator to set up the wind direction and speed, the intended aircraft course and airspeed, and then read off the computed heading and resulting groundspeed. This early model was heavy and mechanically complex, but had the refinement of a small moving indicator to show drift, and also had a circular slide rule on the back.