FREE-FLIGHT-TUNNEL INVESTIGATION OF DYNAMIC LONGITUDINAL STABILITY AS INFLUENCED BY THE STATIC STABILITY MEASURED IN WIND-TUNNE L FORCE TESTS UNDER CONDITIONS OF CONSTANT THRUST AND CONSTANT POWER

摘要

An investigation has been conducted in the Langley free—flight tunnel to determine the dynamic longitudinal stability as influenced by the static stability measured in wind-tunnel force tests under conditions of constant thrust and constant power. The amount of static stability was varied in the flight tests by changing the power applied to a pusher propeller with an offset thrust axis and by shifting the center of gravity of the model. Force tests were made for the purpose of determining the amount of static stability for all flight—test conditions.