ScEBlack1 Posted March 20, 2010 Posted March 20, 2010 Should you set your BA to any particular setting (O) or something else before take off or leave it as is for ASL (above sea level) setting? just curious about this piece.
mvsgas Posted March 20, 2010 Posted March 20, 2010 Normally I set mine to what ever pressure the tower calls when I ask for take off clearance. Not sure if that is the proper way of using it. To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..
msalama Posted March 20, 2010 Posted March 20, 2010 This may clarify things a bit - scroll down to where the author is talking about the QNH and QFE codes: http://en.wikipedia.org/wiki/Atmospheric_pressure I usually calibrate it to QFE myself. The DCS Mi-8MTV2. The best aviational BBW experience you could ever dream of.
Eddie Posted March 20, 2010 Posted March 20, 2010 I'm not sure of the SOPs for rotary wing aircraft, but I always set to QFE as stated by the tower. To me this is far more important at the altitudes helicopers operate at, especially in the Ka-50 as you are more or less always operating in VFR conditions due to the limitations of the aircraft systems. Now when A-10C (and any following fixed wing aircraft) switching to 29.92 during cruise and to stated QFE for takeoff/landing will be more important. Especially as we'll be able to operate in almost all weathers, day and night so instrument flying will be an essential skill.
Zorrin Posted March 20, 2010 Posted March 20, 2010 Given that the Ka-50 has a radar altimeter it makes sense to keep the barometric altimeter on the QNH - altitude above mean sea level. The radar altimeter has a large enough range that you don't need to worry about the difference between QFE and QNH. The radalt will be more accurate than a QFE anyway, because in reality the pressure changes all over the place. Obviously this isn't modelled in BS yet but let's hope that a real weather environment will come with the Hog. Eagles may soar, but weasels don't get sucked into jet engines.
ScEBlack1 Posted March 20, 2010 Author Posted March 20, 2010 Ok I now understand it better but still a bit confused on what is best to set it at, should we listen to the tower when asked to takeoff? or another means?
Frederf Posted March 20, 2010 Posted March 20, 2010 (edited) Proper Russian aviation practice is to use: QFE near the field QNH low-altitude en route QFF high-altitude en route Set the altimeter to the tower-specified QFE value before take off and check that it shows 0m (probably +/- 10m). Outside of the field's area you want to know your true altitude MSL so QNH is what you want. However the controllers aren't able to give you this in the game so you can half-arse it by setting the baro to match GPS true alt. Transition back to QFE for the landing field before landing. High altitude flight would suggest QFF use, equivalent to "flight levels" (pressure altitude) used in the Western world. The Ka-50 ain't passing 18,000' any time soon so it's largely moot. A lot of aircraft (esp. those with radar altimeters) are forgoing setting QFE and just use QHN all the time. Why turn the baro altimeter into an "AGL altimeter" when you have a for-reals radar altimeter? It would also be acceptable to set QNH via the "match GPS true alt." trick. Edited March 20, 2010 by Frederf 1
IvanK Posted March 21, 2010 Posted March 21, 2010 18,000feet is not the world standard transition altitude. In many "flat" countries it is as low as 6000'.
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