Proper use of the SOLVE with the RA command.


Question

When does SOLVE need to preceed the RA command?


Answer

    
The RA command starts the curve at the present heel angle.  For example,
    
  ANGLES = 0, 5, ... 60                                                                       
  HEEL = 7                                                                                    
  RA                                                                                          
    
will run the curve of righting arms at 7°, 12°, etc.
    
The SOLVE command finds equilibrium for the present loading condition.  This
may result in a heel angle which is not zero.  Therefore,
    
  HEEL = 0                                                                                    
  RA                                                                                          
    
and
    
  SOLVE                                                                                       
  RA                                                                                          
    
may result in different angles being used.
    
IF you have a LIMIT such as
    
  LIMIT AREA FROM 0 TO 40 > 10                                                                
    
the angles "0" and "40" will be relative to the starting angle.
    
If your LIMIT is
    
  LIMIT AREA FROM ABS 0 TO ABS 40 > 10                                                        
    
the angles will be relative to upright.
    
There is no need to SOLVE before RA unless you want the RA curve to start at 
the angle of equilibrium.