GHS FAQ

Proper use of the SOLVE with the RA command

Question QA022 :
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 degrees, 12 degrees, 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.

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