Propeller Systems
Analyze steady propeller performance with BEMT and estimate electric UAV mission energy.
AS-PS-05
Available calculations.
- propeller_bemt_analysis
- uav_energy_estimate
- get_propeller_database
Runner example.
The installed skill teaches your agent when to activate this module and how to call the local runner.
propeller_bemt_analysisAS-PS-05
{
"ok": true,
"operation": "propeller_bemt_analysis",
"result": [
{
"rpm": 5000,
"thrust_n": 2.62933,
"torque_nm": 0.123587,
"power_w": 64.71009,
"propulsive_efficiency": 0.8126478,
"advance_ratio": 0.7868852,
"thrust_coefficient": 0.03571671,
"power_coefficient": 0.03458441,
"annuli": [
{
"radius_fraction": 0.21346,
"inflow_angle_deg": 49.56198,
"angle_of_attack_deg": -2.5446,
"lift_coefficient": -0.0541793,
"drag_coefficient": 0.0120587
},
{
"radius_fraction": 0.24693,
"inflow_angle_deg": 46.25228,
"angle_of_attack_deg": -1.20014,
"lift_coefficient": 0.0795733,
"drag_coefficient": 0.0121266
},
{
"radius_fraction": 0.2804,
"inflow_angle_deg": 43.2181,
"angle_of_attack_deg": -0.1312,
"lift_coefficient": 0.1859148,
"drag_coefficient": 0.0126913
},
{
"radius_fraction": 0.31387,
"inflow_angle_deg": 40.34425,
"angle_of_attack_deg": 0.7774,
"lift_coefficient": 0.2763067,
"drag_coefficient": 0.0135269
},
{
"radius_fraction": 0.34734,
"inflow_angle_deg": 37.69376,
"angle_of_attack_deg": 1.46266,
"lift_coefficient": 0.3444782,
"drag_coefficient": 0.0143733
},
{
"radius_fraction": 0.38081,
"inflow_angle_deg": 35.3629,
"angle_of_attack_deg": 2.15841,
"lift_coefficient": 0.4136944,
"drag_coefficient": 0.0154229
},
{
"radius_fraction": 0.41428,
"inflow_angle_deg": 33.24201,
"angle_of_attack_deg": 2.67274,
"lift_coefficient": 0.4648622,
"drag_coefficient": 0.0163219
},
{
"radius_fraction": 0.44775,
"inflow_angle_deg": 31.30772,
"angle_of_attack_deg": 3.00047,
"lift_coefficient": 0.4974661,
"drag_coefficient": 0.0169495
},
{
"radius_fraction": 0.48122,
"inflow_angle_deg": 29.54068,
"angle_of_attack_deg": 3.16096,
"lift_coefficient": 0.5134318,
"drag_coefficient": 0.0172722
},
{
"radius_fraction": 0.51469,
"inflow_angle_deg": 27.9209,
"angle_of_attack_deg": 3.17418,
"lift_coefficient": 0.5147471,
"drag_coefficient": 0.0172993
},
{
"radius_fraction": 0.54816,
"inflow_angle_deg": 26.42965,
"angle_of_attack_deg": 3.05887,
"lift_coefficient": 0.5032759,
"drag_coefficient": 0.0170657
},
{
"radius_fraction": 0.58163,
"inflow_angle_deg": 25.0502,
"angle_of_attack_deg": 2.83176,
"lift_coefficient": 0.480682,
"drag_coefficient": 0.0166211
},
{
"radius_fraction": 0.6151,
"inflow_angle_deg": 23.79526,
"angle_of_attack_deg": 2.60091,
"lift_coefficient": 0.4577159,
"drag_coefficient": 0.0161901
},
{
"radius_fraction": 0.64857,
"inflow_angle_deg": 22.65794,
"angle_of_attack_deg": 2.39943,
"lift_coefficient": 0.4376722,
"drag_coefficient": 0.0158311
},
{
"radius_fraction": 0.68204,
"inflow_angle_deg": 21.59513,
"angle_of_attack_deg": 2.12345,
"lift_coefficient": 0.4102158,
"drag_coefficient": 0.0153655
},
{
"radius_fraction": 0.71551,
"inflow_angle_deg": 20.59851,
"angle_of_attack_deg": 1.78127,
"lift_coefficient": 0.376175,
"drag_coefficient": 0.0148302
},
{
"radius_fraction": 0.74898,
"inflow_angle_deg": 19.66071,
"angle_of_attack_deg": 1.38028,
"lift_coefficient": 0.3362828,
"drag_coefficient": 0.0142617
},
{
"radius_fraction": 0.78245,
"inflow_angle_deg": 18.77499,
"angle_of_attack_deg": 0.9272,
"lift_coefficient": 0.2912088,
"drag_coefficient": 0.0136961
},
{
"radius_fraction": 0.81592,
"inflow_angle_deg": 17.95044,
"angle_of_attack_deg": 0.49252,
"lift_coefficient": 0.2479655,
"drag_coefficient": 0.0132297
},
{
"radius_fraction": 0.84939,
"inflow_angle_deg": 17.1855,
"angle_of_attack_deg": 0.08602,
"lift_coefficient": 0.2075252,
"drag_coefficient": 0.0128613
},
{
"radius_fraction": 0.88286,
"inflow_angle_deg": 16.45894,
"angle_of_attack_deg": -0.35887,
"lift_coefficient": 0.1632659,
"drag_coefficient": 0.0125331
},
{
"radius_fraction": 0.91633,
"inflow_angle_deg": 15.76484,
"angle_of_attack_deg": -0.83622,
"lift_coefficient": 0.1157775,
"drag_coefficient": 0.0122681
},
{
"radius_fraction": 0.9498,
"inflow_angle_deg": 15.09367,
"angle_of_attack_deg": -1.3365,
"lift_coefficient": 0.0660075,
"drag_coefficient": 0.0120871
},
{
"radius_fraction": 0.98327,
"inflow_angle_deg": 14.4185,
"angle_of_attack_deg": -1.83277,
"lift_coefficient": 0.0166364,
"drag_coefficient": 0.0120055
}
]
}
],
"units": {
"thrust_n": "N",
"torque_nm": "N m",
"power_w": "W"
},
"assumptions": [
"Steady axial inflow",
"Blade-element forces coupled to annular axial and angular momentum",
"Caller-supplied linear lift and parabolic drag model"
],
"warnings": [
"BEMT excludes unsteady inflow, compressibility, aeroelasticity, motor limits, and installation effects; validate against the actual propeller test data"
],
"provenance": [
"Blade element momentum theory with Prandtl hub and tip loss",
"U.S. Standard Atmosphere 1976"
]
}