Commonly manufactured rotor blade

A rotor blade configured to be installed on a rotary wing aircraft, the rotor blade comprising:

• a spar extending from an inboard portion comprising a root end to an outboard end, the spar having a first oval cross-section at the root end;
• an upper skin and a lower skin coupled to the spar, the upper skin and the lower skin defining aerodynamic surfaces of an airfoil;
• and
• a blade extender coupled to the inboard portion of the spar, the blade extender having a second oval cross-section at an outboard opening, wherein the second oval cross-section is smaller than the first oval cross-section.

A rotor blade configured to be installed on a rotary wing aircraft, the rotor blade comprising:

• a spar comprising:
• an inboard portion extending from a root of the rotor blade to a first spanwise position of the rotor blade;
• and
• an outboard portion meeting the inboard portion at the first spanwise position;
• an upper skin and a lower skin coupled the outboard portion of the spar, wherein the first spanwise position is defined by a most inboard point at which the upper skin and the lower skin are coupled to the spar;
• and
• a blade extender coupled to the root of the rotor blade, the blade extender configured to couple to the rotor blade to the aircraft,
• wherein the inboard portion comprises a top layer, a bottom layer, and an inner cavity between the top layer and the bottom layer, wherein the top layer has a constant first thickness and the bottom layer has a constant second thickness, and wherein the distance between an outer surface of the top layer and an outer surface of the bottom layer is constant, the outer surface of the top layer and the outer surface of the bottom layer each extending from a leading edge conic to a trailing edge conic.