TrapezoidalFins Class#
Class that defines and holds information for a trapezoidal fin set.
- Geometrical attributes
- Fins.n#
Number of fins in fin set.
- Type:
int
- Fins.rocket_radius#
The reference rocket radius used for lift coefficient normalization, in meters.
- Type:
float
- Fins.airfoil#
Tuple of two items. First is the airfoil lift curve. Second is the unit of the curve (radians or degrees).
- Type:
tuple
- Fins.cant_angle#
Fins cant angle with respect to the rocket centerline, in degrees.
- Type:
float
- Fins.changing_attribute_dict#
Dictionary that stores the name and the values of the attributes that may be changed during a simulation. Useful for control systems.
- Type:
dict
- Fins.cant_angle_rad#
Fins cant angle with respect to the rocket centerline, in radians.
- Type:
float
- Fins.root_chord#
Fin root chord in meters.
- Type:
float
- Fins.tip_chord#
Fin tip chord in meters.
- Type:
float
- Fins.span#
Fin span in meters.
- Type:
float
- Fins.name#
Name of fin set.
- Type:
string
- Fins.sweep_length#
Fins sweep length in meters. By sweep length, understand the axial distance between the fin root leading edge and the fin tip leading edge measured parallel to the rocket centerline.
- Type:
float
- Fins.sweep_angle#
Fins sweep angle with respect to the rocket centerline. Must be given in degrees.
- Type:
float
- Fins.d#
Reference diameter of the rocket, in meters.
- Type:
float
- Fins.ref_area#
Reference area of the rocket, in m².
- Type:
float
- Fins.Af#
Area of the longitudinal section of each fin in the set.
- Type:
float
- Fins.AR#
Aspect ratio of each fin in the set
- Type:
float
- Fins.gamma_c#
Fin mid-chord sweep angle.
- Type:
float
- Fins.Yma#
Span wise position of the mean aerodynamic chord.
- Type:
float
- Fins.roll_geometrical_constant#
Geometrical constant used in roll calculations.
- Type:
float
- Fins.tau#
Geometrical relation used to simplify lift and roll calculations.
- Type:
float
- Fins.lift_interference_factor#
Factor of Fin-Body interference in the lift coefficient.
- Type:
float
- Fins.cp#
Tuple with the x, y and z local coordinates of the fin set center of pressure. Has units of length and is given in meters.
- Type:
tuple
- Fins.cpx#
Fin set local center of pressure x coordinate. Has units of length and is given in meters.
- Type:
float
- Fins.cpy#
Fin set local center of pressure y coordinate. Has units of length and is given in meters.
- Type:
float
- Fins.cpz#
Fin set local center of pressure z coordinate. Has units of length and is given in meters.
- Type:
float
- Fins.cl#
Function which defines the lift coefficient as a function of the angle of attack and the Mach number. Takes as input the angle of attack in radians and the Mach number. Returns the lift coefficient.
- Type:
- Fins.clalpha#
Lift coefficient slope. Has units of 1/rad.
- Type:
float