F-JJTH wrote in Tue Dec 30, 2014 6:01 pm:JohanG: "alt setting" is already used for the InHg field, to be honest I'm sure we can live with "QNH" since it's the most commonly term
That is ok. I can live with that. I had to ask though.
sanhozay wrote in Tue Dec 30, 2014 5:28 pm:F-JJTH wrote in Tue Dec 30, 2014 4:36 pm:Also I improved the InHg and hPa format output in the property tree:
/instrumentation/altimeter/setting-hpa: was a decimal number, now it's an integer (in real life we know the QNH as "1024" or "1025" but never as "1024.74")
Were you aware that the Altimeter Setting Procedures in Europe define the Standard Pressure as 1013.2hPa?
...
The minority of aircraft that allow the altimeter to be set in hPa currently use integers but those that have a STD button should really set the standard of 1013.2. The "setting-hpa" value can always be converted to an integer but the 0.2 cannot be stored in an integer. It doesn't make much of a difference but, for accurate simulation of real aircraft, I believe the "setting-hpa", should remain as a decimal.
I think that doing that (allowing decimal values) is a good thing. Thank you.
Aircraft with a
digital hPa pressure setting can only be set in integer steps (except of course for the STD button), however looking at images of good old mechanical altimeters, in contrast to those who are connected to an air data computer or something similar, the value can of course be set anywhere between the indexes on the scale in the so called Kollsman window. When doing a
Google image search for "Kollsman window" one finds that some inHg scales are only indexed in one decimal steps, though most have two decimals, and that the hPa / mb scales sometimes have an extra index at 1013.25 hPa.