Reliable formulae for estimating airplane performance and the effects of changes in weight, wing area, or power
This is a 1924 NASA technical report, a set of performance charts for estimating airplane behaviour when weight, wing area, or power changes; the record gives no named publisher or intended readership beyond aeronautical engineers. The two pictures are plain black-and-white line graphs with grid backgrounds, plotting horsepower against airspeed in miles per hour with labelled curves, offering a designer a sober scientific chart vocabulary of grids, tick labels, and stepped curve families.
