C DSNOW
Depth of snow cover (0=no snow) [in]
C DTHAW
Depth of thawing [in]
C ITSURF
Hard surface condition: [1]=dry, 2=wet, 3=ice-covered
C SIGMA
Density of snow [gm/cm^3)
C Common /VEHICL/
C CL
Minimum ground clearance [in]
C DIAW(NAMBLY) Undeflected tire diameter, each assembly [in]
C NAMBLY
#traction element assemblies (axles and tracks)
C NVEH(NAMBLY) Vehicle traction assembly type: 0=tracked, 1=wheeled
C NWHL(NAMBLY) #tir es on each wheeled assembly
C SECTW(NAMBLY) Tire nominal section width [in]
C TRAKLN(NAMBLY)
Length of track on ground [in]
C TRAKWD(NAMBLY)
Track width (one side) for each tracked assembly [in]
C WGHT(NAMBLY) Weight on each vehicle assembly [lbs]
C WT(NAMBLY)
Tread widths, each assembly (center to center) [in]
C WTE(NAMBLY) Min. width between traction elements [in]
C
C Outputs:
C Common /DERIVE/
C DOWPB(NAMBLY)
Drawbar coefficient for each assembly
C RTOWPB(NAMBLY)
Motion res. coef., powered or braked, each element
C RTOWT(NAMBLY) Motion res. coef., towed, each element
C Common /TPREP/
C IBASE
CRREL model base code:
C
0 = unassigned
C
1 = super-highway, primary road
C
2 = secondary road
C
3 = off-road & trail
C
4 = Ice
C
5 = soft soil
C
C External:
C RHARD Function to return hard surface resistance for snow
C
C Internal:
C AA Track approach angle (rad)
C AREA1
Contact area single traction element (in^2)
C DEFSEC 1 minus-the deflected radius divided by the section width (in)
C FACT
Conversion factor for N/cm^2 to psi
C FLAG
Deep snow multiplier
C I
Traction assembly index
C IBASE Terrain type flag as follows:
C
1 = road
C
2 = frozen or strong soil
C
3 = unfrozen soil (RCI<100)
C
4 = ice
C PMAX
Maximum suspension element contact pressure (psi)
C PN Number of vehicle passes
C PR1KPA Contact pressure of single traction element Kilo-Pascals
C PRES1
Contact pressure of single traction element (psi)
C RADSI
Radius of current wheeled traction element (in)
C RRES1
Motion resistance from snow (lb)
C RTOW
Temporary resistance coefficient
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