Question:
Pilots, I need help.?
Allison S
2011-04-12 21:34:34 UTC
Ok, so i have to look up different formulas that pilots use. Can you please help me?!? i've looked some up but i dont know if its right, but its TAS=IAS+2%(Altitude/1,000) times IAS
but i have no idea what its for or what tas or the other variables mean, please help, any answer will be greatly appreciated! Please give me any formulas you could possibly think of! Thank youuu!
Six answers:
2011-04-13 00:50:44 UTC
Not sure if you're into trigonometry yet, but a good problem would be figuring out glide slope angle.

Draw a right triangle like this:



_____________ A

_____________/|

___________ /_|

_________/ ___ |

_______/ _____ |

____ / ________|

___/ |

B/____________| C



Point A is your airplane.

Point B is your touchdown spot at the airport.

Segment AC is your altitude. (suppose 1,000 ft)

Segment BC is your distance from the airport. (suppose 5 miles)



Now, you want to figure out at what angle you must descend to make your touchdown spot. (angle A). Using trig,

Tangent of angle A =Opposite over Adjacent legs

Opposite leg is BC (2 miles, which is 26,400 ft).

Adjacent leg is AC (1,000 ft)



So, if you're still reading this,

Tangent of CAB = 26,400/1000 = 26.4

Angle A = ~84.5 degrees.

Now, since Angle A is in the inside of the triangle, subtract the 84.5 degrees from 90 degrees to get the descent angle, which equals 5.5 degrees.



Therefore, you'll need to fly your descent at 5.5 degrees to make your touchdown point.



Hope that helps.

Since CAB is the inside angle of the triangle, subract this number from
2011-04-13 05:04:10 UTC
It would help if you would say why you need this information. Are you a school teacher, student pilot or what?



TAS is true airspeed; the speed an aircraft is moving relative to the air around it

IAS is indicated airspeed, what is being shown on the airspeed indicator.

to compute TAS from IAS requires knowing the true altitude, altitude corrected for barometric pressure, static air temperature and the IAS corrected for instrument error, called Calibrated Airspeed.



Keep it simple. Pilots need to know how long it will take to get somewhere; a speed time distance problem, so lots of variations on this like how far can you go in an hour, with the fuel you have etc. Then apply the head or tail wind to decrease or increase the gound speed. How much fuel this will take; gallons per hour and time and what time and fuel remaining they will have at each intermediate waypoint; initial fuel quantity less fuel used on preceeding segments. Just make up some fuel consumption rates. Most piston twin aircraft use from 22 to 35 gallons per hour for both engines.



These problems are simple ratio problems. 100 miles per hour times four hours=four hundred miles.



Also, don't wait until the last second to do your homework.
Devon A
2011-04-13 20:19:10 UTC
Like a previous answer said, most pilots don't really use a ton of formula after flight training. In the airlines, I usually only use math to determine what are called crossing restrictions. Air traffic control will say for example "cross the Falcon VOR at 14,000 ft. If we were at 25,000 ft, there is simple math to figure out when we need to start descending, and at what rate. Take the difference in altitude (25-14=11). Multiply that number by 3, so 33. This means you need to start a descent 33 miles away from the Falcon VOR. The next step is the descent rate. Take the aircraft's groundspeed (the speed of the aircraft over the ground, taking the wind into account) and multiply it by 6. For example, if the groundspeed is 300 knots, 300 x 6= 1800. You need to descend at 1800 feet per min.
Mark
2011-04-13 09:42:03 UTC
The plane's speed through the air mass is its true airspeed.



The airspeed meter gives a useful idea of speed under many circumstances, but not all. It underestimates the airspeed as density altitude increases.



So if you're airspeed indicator shows an airspeed of 100 knots when flying at a density altitude of 8000 feet, the plane is really going 16% faster than that, 116 knots, through the air. 116 KTAS.
2011-04-13 13:52:28 UTC
Sorry to be of no help in your assignment, but pilots don't use much in the way of formulas to do anything. Simple, basic math that you can do in your head is about all that is used. I flew Navy jets and there is not time to write out math problems, solve and then apply the solutions.
2011-04-13 15:30:08 UTC
Sorry about yoru Dad being a drunk pilot when he is off duty. Not Good.



This might help you in figuring our your question.

http://en.wikipedia.org/wiki/True_airspeed


This content was originally posted on Y! Answers, a Q&A website that shut down in 2021.
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