
Ch03-H6927.tex 30/6/2007 12: 19 Page 49
Static Equilibrium and Trim 49
force, will exist at the new position. To rectify the problem he must use the trim tab.
Having moved the control to the position corresponding with the new trim condition
he will be holding a force on the control. By adjusting the trim tab he can null the
force and following which, he can release the control and it will stay in the new
hands-off position as required. Thus trim tab adjustment is equivalent to control force
adjustment, which in turn is directly related to elevator hinge moment adjustment in
a mechanical flying control system. To reiterate the previous illustration, ...