Originally Posted by Genghis the Engineer
The other complication is that pitot-static systems are inaccurate below 1.3Vs and hellishly inaccurate below Vs.
A little off-topic, but I know you have flight testing experience: if you would like to fly at low speeds (below 1.3 Vs for example) 5 knots slower, you should "convert" your IAS to CAS, reduce it by 5 knots and "convert" it back to IAS. Is my understanding correct?