Design and simulation of an unmanned aerial vehicle (UAV) highly depends on the thrust produced by a motor-propeller\ncombination. The aim of this paper is to model a generalized mathematical relationship between the motor RPM and the\ncorresponding thrust generated for the preliminary design process of low Reynold�s number applications. A method is\ndeveloped to determine a generalized mathematical model which relates inflow velocity to coefficient of thrust using\nexperimental data from 291 motor-propeller data points, comprising of input RPM and corresponding output thrust. Using this\nrelationship, the Force Constant is calculated, which defines each Thrust-RPM mathematical model. In the first part, expression\nof the inflow ratio obtained from Blade Element and Momentum Theory (BEMT) is approximated to a simplified form. In the\nlater part, the proposed mathematical model is validated against two new sets of pairs of motor-propeller combinations. A\nspecial note in the Appendix talks about the application of this mathematical model. The computed results are found to be in\ngood agreement with the experimental data.
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