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等集成 DCS Spitfire IX Flight Manual CN.pdf

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For energy and G calculation , it must use TAS. Mach number is from TAS, not IAS.

You know there is no TAS indicator on most early wwii fighters. But in every performance test charts from the test flight it was converted to TAS. Do you know why?

Do you know the Mach number is TAS/speed of the sound at that condition?

The performance of an aircraft mainly are how fast and how high it can fly, how tight and how fast it can turn, and climb, etc. you will unlikely to see IAS in it.

Can you understand the steady turn is a constant radius turn? Wind just make the turn center move, not changing the radius. Just like a wheel rolling on the ground. Every point on it have a constant turn radius, but the center is moving forward.

Yes. It's a steady turn.

If you can do it with IAS, but more date must be needed such as tempreture and pressure. First convert the IAS to TAS with them, then calculate the rest.

Turn on the smoke during the turn and it will tell you why not count the wind.

That's dynamics. The mesuring the perfomance of an aircraft mostly means kinematics.

For another example, your aircraft is in steady level turn in steady wind. Your IAS is 300 kts, you are pulling 3 G in the turn. Wind speed is 50 kts. You can't calculate your turn rate or turn radius with these information. But if you know your TAS, for example is 350 kts, you can calculate them with it and get your turn rate is 8.82 deg/s, turn radius is 1170 m.

The calculation can be done perfectly without GS and wind, but only TAS. The air of steady wind is an inertial reference system.

No, there is no need for GS and wind caculation in ACM. Only A2G aimming need those correction. There is no different for whether the air is moving (wind) or the ground is moving reversely.

But your energy management must use TAS. Max rate turn is only one case in ACM. IAS tell you how to get max turn rate, TAS tells you how Max the turn rate can be. The radius doed affect the head to head dogfight for example, to chose one cirlcle fight or two circle, or how to keep your seperation and to pull how many leading turn.

No. For a steady turn in constant wind condition, the turn radius is always changing looking from the ground (navigation flight path). But for the aircrafte perfomance caculation, you ARE flying in a circle with constant turn radius.

For example, for turn radius, TAS and G, you can get one of them with two others are known. IAS can't. If you don't care how tight your turn is, you don't need TAS.

TAS * flight time = the length of flight path. TAS^2/radius = |vector {G + gravity}| That's the performance.

Corner speed is for pilot to maneuver. To evaluate how good the aircraft turn, you must use TAS.

Try the AV-8.

IAS is very useful for pilot to handle the aircraft. But it's useless for performance ralated like energy analysis, BFM tactics etc. You'll never care about your enmey's IAS in combat, but only his TAS.

CAS/IAS/EAS is mostly for dynamic/structural strength/load caculation, not performance. If you use IAS for turn performance, you will get a circumference of 360 degrees turn less than 2pi*radius.