RCAIDE.Library.Methods.Performance.estimate_landing_field_length
estimate_landing_field_length#
- estimate_landing_field_length(vehicle, analyses, altitude=0, delta_isa=0)[source]#
Computes the landing field length required for a given vehicle configuration at specified airport conditions.
- Parameters:
vehicle (Vehicle) –
- The vehicle instance containing:
- mass_properties.landingfloat
Landing weight [kg]
- reference_areafloat
Wing reference area [m^2]
- maximum_lift_coefficientfloat, optional
Maximum lift coefficient if pre-computed
- Vref_VS_ratiofloat, optional
Ratio of approach to stall speed, default 1.23
analyses (Analyses) – Container with aerodynamic analyses for computing maximum lift coefficient
altitude (float, optional) – Airport altitude [ft], default 0
delta_isa (float, optional) – Temperature offset from ISA conditions [K], default 0
- Returns:
landing_field_length – Required landing field length [m]
- Return type:
float
Notes
The landing distance is computed using a semi-empirical approach:
\[LFL = k_1 + k_2 V_{ref}^2\]- where:
k₁ = 250 (constant)
k₂ = 2.485/g for two-wheel trucks
Vref = 1.23 * Vstall (default)
- Major Assumptions
Two-wheel truck landing gear configuration
Sea level standard atmospheric conditions unless specified
Standard approach speed ratio (1.23 × stall speed)
No wind conditions
Theory The stall speed is computed as:
\[V_{stall} = \sqrt{\frac{2W}{\rho S C_{L_{max}}}}\]References
[1] Torenbeek, E. (2013). Advanced Aircraft Design: Conceptual Design, Analysis and Optimization of Subsonic Civil Airplanes. Equation 9.25.