Hey guys, in flight sim i go to set the QNH, on the altimeter...But it doesnt let me you cant turn the little knob!
Is there any other way of doing it?

Also, what's the diffrence between QNH and Altimeter (29.92)...etc

Because i wonder if you have to set the altimeter to 29.92 or whatever it is instead of QHN but how do you work out that?


Cheers

Iberworld-pilot

If that makes sense please answer

http://www.flightlevel350.com/forum/index....showtopic=10557

That topic is pretty much what you're looking for.

On flight sim, the altimeter is set using inches of mercury i.e. 29.92 standard pressure (ISA- International Standard Atmosphere). I know this is the case in the 172.

However, I have my flight sim set to 'Hybrid' to measure in feet and millibars. This means that I recieve a QNH (but never a QFE annoyingly) in millibars i.e. 1013mb (1013.2 standard pressure). (By the way, 1mb equals approximately 30 feet in height/altitude).

Millibars and hectopascals are the same i.e. 1mb= 1 hPa, but as Eric poiinted out in that topic, hPa is a standard unit and is being adopted in many parts of the world.

All 3 work out the same thing- but they're different units. Its like comparing 2.5cm to 1 inch.

To change it in flight sim, there should be a little knob by the altimeter. Hover you mouse over it, and your cursor should change to either a plus or a minus, and then you click and hold whilst the subscale changes.


Hope this helps

Hah! Funny story...i was on my first flight in UK Airspace on VATSIM and EGLL_N_GND was like "Excellence 891, readback correct, QNH 1013, departing runway 09R, advise push and start". I had to call him back and ask what "Que and EX" was because that's what it sounded like. He said "just press B on your flight sim, its the same as what the american's call altimeter" i thanked him, and sure enough, on my flight sim guage, it said "MB 101302 ALTIM 29.92" Some gauges show millibars, some dont, but it's the same ting, just different format. US uses Inches of Mercury and Europe usues Millibars. I like QNH better because it sounds cooler. I'm a ATC at Los Angeles and i just wanna convert my altimeter so badly sometimes, especially for the French pilots who fly back and forth between Paris, they always readback wrong. "Uh...roger sir, QNH 2997" "Air France 28 Heavy, negative sir, Altimeter 29.97" "Oh okay, altimeter, rgr thanks for AFR28" So, he only difference between the two is format, just press b and you're set.

I found this actually: http://www.csgnetwork.com/pressinmbcvt.html Its a millibar-inches of mercury calculator.

It uses these calculations:

To convert inches of mercury to millibars, multiply the inches value by 33.8637526
To convert millibars to inches of mercury, multiply the millibar value by 0.0295301