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Grabo172 · February 22nd, 2005, 08:18

Good explaination Jetman, I just have one minor correction...

The pitot tube feels Total Pressure (Total Pressure = Dynamic Pressure + Static Pressure)

IAS is based on Dynamic pressure. To get Dynamic Pressure from the pitot tube you have to do some quick algebra and get the equation Dynamic Pressure = Total Pressure - Static Pressure.

The Airspeed Indicator mechanically does this by opposing the measured Pitot Tube Pressure (Total Pressure) against the Static Pressure.

Then the manufacturer calibrates the face plate of the Airspeed Indicator to relate the measured Dynamic Presssure to an IAS.

February 22nd, 2005, 08:18	#4
Grabo172 Senior Member Join Date: Feb 2004 Location: Peterborough, NH Posts: 1,291	Re: TAS/CAS/IAS Good explaination Jetman, I just have one minor correction... The pitot tube feels Total Pressure (Total Pressure = Dynamic Pressure + Static Pressure) IAS is based on Dynamic pressure. To get Dynamic Pressure from the pitot tube you have to do some quick algebra and get the equation Dynamic Pressure = Total Pressure - Static Pressure. The Airspeed Indicator mechanically does this by opposing the measured Pitot Tube Pressure (Total Pressure) against the Static Pressure. Then the manufacturer calibrates the face plate of the Airspeed Indicator to relate the measured Dynamic Presssure to an IAS.