usb777 Posted January 2, 2015 Share Posted January 2, 2015 What is the more real setting under aircraft airspeed, true airspeed or indicated airspeed? Which is the prefered setting for the program? Mike G. Intel Core i7-4770K, ASUS MAXIMUS VI HERO Motherboard, , 8GB Memory , EVGA GeForce GTX 1070 6GB Video Card,Corsair Enthusiast 750W 80+ Bronze Certified ATX Power Supply,Windows 7 64bit, Corsair Hydro Series H55 CPU Cooler Link to comment Share on other sites More sharing options...
sag75 Posted January 2, 2015 Share Posted January 2, 2015 Indicated airspeed. As higher you fly, less dense is the air, and thus Pitot probe will give you lower airspeed values. Link to comment Share on other sites More sharing options...
mrzippy Posted January 2, 2015 Share Posted January 2, 2015 I always use Indicated. I tried using True Airspeed once and got so screwed up it made my head spin! Still thinking about a new flightsim only computer! Link to comment Share on other sites More sharing options...
PPSFA Posted January 2, 2015 Share Posted January 2, 2015 Use IAS as that is the reference for all 'V' speeds. Use TAS for flight planning Use GS for actual flight time Link to comment Share on other sites More sharing options...
lnuss Posted January 2, 2015 Share Posted January 2, 2015 As the others have indicated above, real pilots use indicated airspeed, which reacts to air density. As air density is reduced (higher altitude, hotter temperatures), the actual (true) speed needed for best climb, glide and other performance parameters increases. Since indicated airspeed uses ram air pressure into the pitot tube to measure speed, it automatically compensates for the changing air pressures -- all the pilot has to do is maintain the same indicated airspeed to get the same airflow pressure over the wing and through the prop as he'd get at sea level. That same IAS is used, almost regardless of altitude and temp, for climb, glide, stall, and various other "V" speeds (Vne, Vso, etc.). Almost, because certain ones change gradually under certain conditions, but that's too complex for this immediate discussion. You can get a lot more information on this in the Speeds and Altitudes section of the Real Aviation Tutorials & FAQs forum section below, as well as at Wikipedia and a few other places on the web. Hope this helps. Larry N. As Skylab would say: Remember: Aviation is NOT an exact Science! Link to comment Share on other sites More sharing options...
pvarn Posted January 2, 2015 Share Posted January 2, 2015 I'll agree with what's been said. If you are flying modern planes and airliners, use Indicated. This is especially important because most planes specify stall and max speed as IAS. IAS changes with altitude which you need. TAS does not so much so will give you readings which could cause you to stall or overspeed at high altitude. TAS can be useful in an aircraft very close to the ground, but IAS is more useful. Take a look at the GPS map if you use it. You'll see Ground Speed being reported. True Air Speed is *close* to ground speed under most conditions. -Pv-. 2 carrot salad, 10.41 liter bucket, electric doorbell, 17 inch fan, 12X14, 85 Dbm Link to comment Share on other sites More sharing options...
lnuss Posted January 2, 2015 Share Posted January 2, 2015 True Air Speed is *close* to ground speed under most conditions. And, is identical under zero-wind conditions. Larry N. As Skylab would say: Remember: Aviation is NOT an exact Science! Link to comment Share on other sites More sharing options...
usb777 Posted January 2, 2015 Author Share Posted January 2, 2015 Thank you all! And Happy New Year! Mike G. Intel Core i7-4770K, ASUS MAXIMUS VI HERO Motherboard, , 8GB Memory , EVGA GeForce GTX 1070 6GB Video Card,Corsair Enthusiast 750W 80+ Bronze Certified ATX Power Supply,Windows 7 64bit, Corsair Hydro Series H55 CPU Cooler Link to comment Share on other sites More sharing options...
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