18 🌯 WRAP

Kinematic performance model providing pre-computed statistical flight parameters for different flight phases.

18.0.1 `WRAP(ac)`

Create a WRAP model for a specific aircraft type.

Parameters:

ac (str): ICAO aircraft type code (e.g., “A320”)

Takeoff

Method	Description
`takeoff_speed()`	Takeoff speed
`takeoff_distance()`	Takeoff distance
`takeoff_acceleration()`	Takeoff acceleration

Initial climb

Method	Description
`initclimb_vcas()`	Initial climb CAS
`initclimb_vs()`	Initial climb vertical rate

Climb

Method	Description
`climb_range()`	Climb range distance
`climb_const_vcas()`	Speed for constant CAS climb
`climb_const_mach()`	Speed during constant Mach climb
`climb_cross_alt_concas()`	Crossover altitude when constant CAS starts
`climb_cross_alt_conmach()`	Crossover altitude from CAS to Mach
`climb_vs_pre_concas()`	Vertical rate before constant CAS
`climb_vs_concas()`	Vertical rate during constant CAS
`climb_vs_conmach()`	Vertical rate during constant Mach

Cruise

Method	Description
`cruise_range()`	Cruise range
`cruise_alt()`	Average cruise altitude
`cruise_init_alt()`	Initial cruise altitude
`cruise_max_alt()`	Maximum cruise altitude
`cruise_mach()`	Average cruise Mach
`cruise_max_mach()`	Maximum cruise Mach
`cruise_mean_vcas()`	Mean cruise CAS

Descent

Method	Description
`descent_range()`	Descent range
`descent_const_mach()`	Speed during constant Mach descent
`descent_const_vcas()`	Speed during constant CAS descent
`descent_cross_alt_conmach()`	Crossover altitude from Mach to CAS
`descent_cross_alt_concas()`	Crossover altitude when constant CAS ends
`descent_vs_conmach()`	Vertical rate during constant Mach descent
`descent_vs_concas()`	Vertical rate during constant CAS descent
`descent_vs_post_concas()`	Vertical rate after constant CAS

Approach and landing

Method	Description
`finalapp_vcas()`	Final approach CAS
`finalapp_vs()`	Final approach vertical speed
`landing_speed()`	Landing speed
`landing_distance()`	Landing (braking) distance
`landing_acceleration()`	Landing deceleration

Return format

All methods return a dictionary with three keys:

{"default": ..., "minimum": ..., "maximum": ...}

The values represent typical default values and the statistical minimum and maximum observed in real flight data.

Example:

import openap

# Create WRAP model for A320
wrap = openap.WRAP("A320")

# Get takeoff speed statistics
print("Takeoff speed:", wrap.takeoff_speed())

# Get cruise parameters
print("Cruise Mach:", wrap.cruise_mach())
print("Cruise altitude:", wrap.cruise_alt())

Takeoff speed: {'default': 85.3, 'minimum': 74.5, 'maximum': 96.0, 'statmodel': 'norm', 'statmodel_params': [85.29, 7.47]}
Cruise Mach: {'default': 0.78, 'minimum': 0.75, 'maximum': 0.8, 'statmodel': 'beta', 'statmodel_params': [17.82, 5.05, 0.62, 0.2]}
Cruise altitude: {'default': 10.92, 'minimum': 10.0, 'maximum': 11.84, 'statmodel': 'norm', 'statmodel_params': [10.92, 0.56]}

18.0.1 WRAP(ac)

18.0.1 `WRAP(ac)`