Hi
Stallie
Tell 'em that at low altitude the engine has to be
artificially restricted ie throttled, to produce the amount of power that is correct for the airframe's most efficient speed. This causes a dramatic loss in efficiency.
Going higher reduces the throttling, restoring the engine's potential efficiency.
At the same time, the airspeed indicator is built to be accurate only in particular atmosphere conditions. The result is that it is not very accurate at altitude & under-reads.
They'll probably then ask why one isn't made for altitude. Point out that it would fill the a/c to have an ASI for every single variance in altitude & temp. Then show them the adjustable TAS scale on either the ASI or your whiz wheel.
Of course, if you were Slasher you could probably just tell them to "F*** off or I'll lose my concentration & then we'll crash and die."
