Chapter 8:
Main Toolbar Features
VSP User Manual
66
Version 1.7.92
WSPAN
: Total wing span
Card 8
LTAIL:
the distance (in feet) from the wing quarter chord (C/4) to the quarter chord of
horizontal tail measured in the free-stream “X” direction.
ZTAIL:
the distance (in feet) from the wing quarter chord to the quarter chord of the
horizontal tail measured in vertical “Z” direction.
SWPWNG:
the sweep of the wing’s leading edge
CDMACH:
the aerodynamic drag coefficient
ISTAB:
when the value is 1, it performs a stability derivative calculation.
IAERO:
when the value is 0, it uses the values of the pressure integrated C
L
and C
D
(default). When the value is 1, the Trefftz plane values of C
L
and C
D
are used
CDO:
the parasitic drag coefficient, which is based on drag due to zero lift.
Card 9
IBURST:
a value of 1 will turn on the Vortex Burst model
XREF:
the location (in x) of the start of the vortex
ANGCRT:
the critical angle. If the leading edge sweep of the panel is less than
ANGCRT, the Vortex Burst model is not applied. This can be used in cases where the
Vortex Burst model should be applied to a delta wing, but perhaps no to some other
lifting surface (canard, etc.) that while behind the starting vortex point, and meeting the
vortex point, and in the vortex region. The default is 0 degrees.
CK1:
the default value is 1
CK2:
the default value is 0
CK1 and CK2 are matching factors. The vortex burst model takes the form
DCP = -1 + CK1*F(x, Cl) + CK2
Where DCP is the delta-CP, x is the distance from the start of the vortex,
and Cl is the total CL determined from Vorlax without vortex burst. If a subpanel