Patent ID: 8196857

Claim:
A bellcrank for a manual flight control device dedicated to making a selected flight attitude change in a rotary wing aircraft receiving it, said bellcrank comprising at least a main body mounted to pivot about a pivot axis, said main body defining perpendicularly to said axis both a first radius and a second radius that diverge from each other at a crank angle; said first radius having a first hinge at its outside end and said second radius having a second hinge at its outside end, the hinges being suitable for connecting the first and second radii respectively to first and second portions of a flight-attitude-changing linkage that actuates at least one airfoil of the aircraft receiving the crank, wherein said flight-attitude-changing linkage is of gain that is variable, and wherein, for this purpose, said bellcrank includes a first slider suitable for being moved relative to the pivot axis in a first direction for adjusting the length of the first radius, while a second slider is suitable for being moved relative to the pivot axis in a second direction for adjusting the length of the second radius, said first slider including a connection finger close to the inlet movement hinge, the finger being for connection to a setpoint flight-attitude-changing linkage that is distinct from the variable-gain linkage, said finger) being movable between two extreme positions for minimum gain and for maximum gain.