Approximation method for determining the static stability of a monoplane glider
This is a 1927 NASA technical report, issued through the NASA Technical Reports Server, presenting an approximation method for judging the static stability of a monoplane glider. Its two pictures are engineering drawings: a plan and side view of a glider with dimensions marked in metres, and a line chart plotting a stability coefficient against span ratio on rectangular wings. A designer might take from them the clean dimensioned technical plate style and the sparse grey-line graph conventions with dashed and solid curves labelled by numbers.
