Propulsion PDR #2 Brian Barnett Rob Benner Ryan Srogi John Keune Alex Fleck

Objectives Iterative process to match the power needed by the propeller with the power produced by the batteries, motor, and gearbox Choose a propeller for the aircraft Develop power requirements for the motor and gearbox

Prop Selection Based on Historical Data

Gold.m Analysis Iterations were run with different propeller diameters all with pitch to diameter ratio of 2:3 Gold.m was run with two different propeller sizes from an RPM of 1000 to 3500 After optimum diameter was selected iterations were run with varying pitch

Highest efficiency at 1500 RPM Power output much less than 15.3 ft-lbf/sec required Highest efficiency with required power output achieved is.71

Gold Analysis Results

Propeller Selection 15x8 propeller 3100 RPM Power output 15.3 ft-lbf/sec Thrust of.75 lbf Flight velocity of 20 ft/sec

Gearbox/Motor Requirements Gearbox –Power output = prop power input = ft-lbf/sec –Torque output =.083 ft-lbf –Output RPM = 3100 –Gearbox efficiency =.95 (conservative estimate) Motor –Power output ft-lbf/sec