aerosandbox.library.propulsion_propeller
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Module Contents#
Functions#
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Using dynamic disc actuator theory, gives the shaft power required to generate |
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Returns the estimated mass of a propeller assembly for low-disc-loading applications (human powered airplane, paramotor, etc.) |
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Estimates the mass of a gearbox. |
- aerosandbox.library.propulsion_propeller.propeller_shaft_power_from_thrust(thrust_force, area_propulsive, airspeed, rho, propeller_coefficient_of_performance=0.8)[source]#
Using dynamic disc actuator theory, gives the shaft power required to generate a certain amount of thrust.
Source: https://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node86.html
- Parameters:
thrust_force – Thrust force [N]
area_propulsive – Total disc area of all propulsive surfaces [m^2]
airspeed – Airspeed [m/s]
rho – Air density [kg/m^3]
propeller_coefficient_of_performance – propeller coeff. of performance (due to viscous losses) [unitless]
- Returns:
Shaft power [W]
- aerosandbox.library.propulsion_propeller.mass_hpa_propeller(diameter, max_power, include_variable_pitch_mechanism=False)[source]#
Returns the estimated mass of a propeller assembly for low-disc-loading applications (human powered airplane, paramotor, etc.)
- Parameters:
diameter – diameter of the propeller [m]
max_power – maximum power of the propeller [W]
include_variable_pitch_mechanism – boolean, does this propeller have a variable pitch mechanism?
- Returns:
estimated weight [kg]
- aerosandbox.library.propulsion_propeller.mass_gearbox(power, rpm_in, rpm_out)[source]#
Estimates the mass of a gearbox.
- Based on data from NASA/TM-2009-215680, available here:
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090042817.pdf
R^2 = 0.92 to the data.
- To quote this document:
“The correlation was developed based on actual weight data from over fifty rotorcrafts, tiltrotors, and turboprop aircraft.”
- Data fits in the NASA document were thrown out and refitted to extrapolate more sensibly; see:
C:ProjectsGitHubAeroSandboxstudiesGearboxMassFits
- Parameters:
power – Shaft power through the gearbox [W]
rpm_in – RPM of the input to the gearbox [rpm]
rpm_out – RPM of the output of the gearbox [rpm]
- Returns:
Estimated mass of the gearbox [kg]