force per G-must be positive but should be 
of the proper magnitude. The stick force 
gradient must not be excessively high or the 
airplane will be difficult and tiring to maneuver. 
Also, the stick force gradient must not be too 
low or the airplane may be overstressed in- 
advertently when light control forces exist. 
A maneuvering stick force gradient of 3 to 8 
lbs. per G is satisfactory for most fighter and