Winter Altimeter Scale Ring
For Use With:
4 FGH 10 80mm or 4 FGH 20 57mm Altimeter
Winter Instruments Altimeter Scale Ring
General Description
Winter Altimeter Scale Ring - Prior to a cross–country flight, the altimeter is usually set to field elevation. Atmospheric pressure reduced to pressure at sea level (QNH pressure) is then indicated in the Kollsman window. Throughout the flight, the altimeter reads height above sea level. In many instances, it is also desirable to know one’s relative altitude above a defined landmark, as well as height above sea level. On a final approach, for example, it is essential to know one’s height above the landing field at any given time. Once the arrow on the rotatable scale ring has been set to the elevation of the landing field, the altitude above the field can be read off the gradations at any time until touchdown (reading corresponds to the QFE setting). Further applications include the safe crossing of ground obstacles (mountain ranges) or control zones, cases in which the difference in altitude can be read directly once the ring has been correctly adjusted. The scale ring has also proved particularly useful for destination approach calculations in performance gliding.
Use above selection for Winter Instruments Altimeter Scale Ring.
For use with 4 FGH 10 80mm Altimeter or 4 FGH 20 57mm Altimeter.
The numbers 3, 6, 9, etc. show the feet positions 300, 600, 900, etc. on the metric altimeter.
W&W typically stocks both WInter Instruments Scale Rings.
