| Description | I recently submitted this request and it was closed for an accurate reason of quote: "The US Armed forces use Metric units, not imperial." which was right and also wrong. After doing my research into the matter I found out that the US citizens use imperial but the US armed forces use metric. In simple terms the US armed forces use metric because of a NATO agreement that makes it easy to work with allies around the world. US armed forces aviators in flight school are taught imperial and metric then how to convert between the two so essentially they are well versed in both. Now far as actual application, US armed forces measure their velocity in knots/ nautical miles and they measure distance in meters. Nautical miles isn't imperial but statute miles is imperial which is MPH. Ktas, kias, kcas, keas are standard for aeronautical velocity. Km/h/MPH wouldn't give accurate indication of airspeed because they track ground speeds. So technically although they are using metric, they aren't using imperial in practical flight application, they use knots then mach for faster aircraft and meters for distance as it is superior to feet: (which civilians mainly use). In conclusion I find that the digital instruments in the CH47, UH60, and UH1Y accurately display the correct indications for airspeed;knots/kias and altitude;meters... except for the AH64 and AH1Z attack helicopters that display the incorrect airspeed indication on HMD in metric thus creating a double standard. |