If an airplane (lets say a fixed pitch piston prop) at say 2300rpm gets an IAS of 90 kts. at 2000 feet , will it get the same IAS at 8000 feet.
well, it will need more power in order to maintain the same IAS at a higher altitude. at the same thrust setting you will slow due to using a higher aoa to maintain altitude
For given Indicated Airspeeds , the total Drag does not change with density (pressure or temperature) at a given mass"
For a decrease in density will result in a proportionate increase in [V^2] so for a given Cl at a given alpha drag remains constant, at constant [EAS], but the higher alpha required to maintain altitude at a slower airspeed [if you don't increase power to maintain that airspeed] then slower flight imparts more induced drag as Cd is increased with a higher alpha.
Does the statement apply to props and jets ?
I guess broadly it applies to both, but the difference is a little abstract....
