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Does this just mean that at an optimum altitude on a standard day that an airplane's true airspeed will be a given amount, and this is how 'fast' a plane is? If true airspeed increases with altitude, how do you measure the relative speediness of an airplane? |
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No, I think "true out..." refers to the difference between indicated airspeed--what you read on the ASI, and true airspeed corrected for temperature and pressure. Your flight computer or (if you go 'WAY back, your E-6B circular slide rule) has scales for this calculation. Some aircraft have a correction scale on the ASI on which you can line up 29.92 (standard pressure) with the outside air temperature. The indicator needle then points to TAS. |
