Why Indicated Airspeed?

Question

This question is about small plane. Why does aircraft V speed always refers to the indicate airspeed/calibrated? As we know it just show the air flows through the pitot tube, and the pitot tube got some inherent errorrs. And as it calibrated, and corrected by non-stndrd temperature and air pressure, we got the true airspeed, that for me represent the quality of air flows through the wing that directly correspondent to the aerodinamc forces like lift etc. Not the IAS. So why the V speed is not in TAS?

Answer 1

If you are taking off, do you want to have to keep figuring out what the true airspeed is as you accelerate down the runway?

If the operating airspeeds are stated in terms of the indications of the pointer on the airspeed indicator, then you don't have to look at anything but the centerline and the airspeed dial.

As the aerodynamic functions of the airplane also depend on the same variations that affect the indicator, the airplane always responds at IAS.

Get a little flight training, and you will see what we mean.

Good luck.

Answer 2

The reason V speeds are not shown in TAS is because when you look at your airspeed indicator you see IAS. If V speeds were published in TAS, you would have to grab an E6-B and calculate your true airspeed every three seconds. Imagine having to recalculate TAS every time you wwanted to know what your airspeed is...

Also...the factors that affect TAS and cause the errors associated between it and IAS also affect the airplane as a whole. To that end, despite what your density altitude is, you should always fly approaches at the same IAS. Meaning, you would approach faster at a higher altitude airport, but only to the extent that your TAS increases relative to your IAS.

It makes it easier is all I'm really saying.

Answer 3

Indicated Airspeed is in simple terms that, what the gadgets point out the airspeed as. actual Airspeed is the fairly airspeed, corrected for temperature and rigidity. floor velocity is the value of the airplane over the floor. All 3 might nicely be diverse. F'rinstance, you are able to nicely be flying at an airspeed of a hundred and twenty knots, yet with a 20 knot headwind lowering your groundspeed to one hundred knots.

Answer 4

It doesn't matter what the true airspeed is, everything is done at indicated, look at the arcs on the AI. Stall speed will be the same regardless of conditions. Put the flaps down at the top of the arc. VNE will be what you see on the AI.
The airplane has no idea about non-standard conditions, and it will stall at the indicated airspeed every time.

Answer 5

Because the aircraft's performance speeds will be different for every different pressure altitude and temperature.

IAS allows for the same speed to be used in all situations. If we used TAS, the stall speed would be much higher at high altitudes because of the thin air. It IS higher, but with IAS we don't have to correct for it.

Answer 6

you are mixing apples and oranges........

V speed is for the aircraft take-out and TAS is for true speed.

the Pietro static tubes need to be calibrated in a d P/S tester and the tester has to be calibrated also...depends on the user it could be every year or every two years. The P/S tubes need to be calibrated any time the lines are disconnected.