Tension torsion strap of a rotor head of a rotary wing aircraft

A rotor head of a rotary wing aircraft, comprising:

• a rotor hub comprising through holes,
• a rotor drive train hub, and
• a multiplicity of blade holder,
• a plurality of tension torsion straps having a body and comprising a first peripheral area arranged in direction of a longitudinal axis comprising a connection eye, a central section and a second peripheral area with a connection eye, wherein at least one of the plurality of tension torsion straps comprises a multiplicity of joined layers, and wherein the at least one of the plurality of tension torsion straps comprises, without attachment of additional components at at least one of the body and the joined layers, an asymmetric shape relatively to a transverse axis due to two unequally shaped peripheral areas configured to remain out of alignment when folded around the transverse axis, wherein the at least one of the plurality of tension torsion straps further comprises an index attached at one of the peripheral areas, the index configured to form the overall asymmetric shape, and
• wherein the blade holder is configured to be affixed to the plurality of tension torsion straps at the rotor drive train hub when the plurality of tension torsion straps protrude through the through-holes.