Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight

Safety Margins for Flight Through Stochastic Gusts

W IND disturbances are a common factor in aviation accidents. Among 126 airplane accidents that occurred between 1979 and 2009 involving loss of control in flight, 14% listed windshear, turbulence, or thunderstorms as a cause or contributing factor. Moreover, 86% of the accidents initiated by atmospheric disturbances led to an upset flight condition, which usually entails an excursion of the ai...

Frequency Response of simple RC circuits

To connect ten resistors totally isolated from one another, we need twenty five-socket strips. To connect them in parallel, we need six strips. To connect them in series, we need eleven strips. To connect them as a series of two groups of five resistors in parallel, we need eight strips. Given a sinusoidal 10 Vpp signal at f =100 kHz, the maximum rate of change is 2πf(10/2) ' 3.14 V/μs. For a t...

Unsteady Lift Slope Values Obtained from Flight Measurements in Gusts

SUINARY Flight measurements have been made of the unsteady lift due to gusts on a Meteor 7 aircraft. Values of the lift slope obtained from these measurements show a marked reduotion with increasing frequency, and in the range 1 to 5 cIp.a~, da(f) df =-0.2 per oppose; at 5 c.p.s. the value of the lift slope is reduced to three quarters of its steady state value, The main experimental errors inh...

Scaling of Airplane Dynamic Response to Stochastic Gusts

This paper studies the scaling of airplane dynamic response to stochastic wind gusts, with focus on the relationship between airplane size and airspeed variations. The results have applications in the design and control of small-scale aircraft for robustness with respect to turbulence. Using linearized equations of motion and the Dryden model of gusts, the paper presents analytical and numerica...

Calculation of the Response of a Transport Aircraft to Continuous Turbulence and Discrete Gusts and a Comparison with Flight Measurements