Compact propeller blade retention assembly

A system comprising:

• a plurality of hub arms coupled to and extending radially outward from a hub center, at least one hub arm of the plurality of hub arms comprising a hub arm lug;
• a plurality of rotor blades;
• a tension-torsion assembly configured to couple one of the rotor blades to the at least one hub arm, the tension-torsion assembly comprising:
• a tension-torsion strap comprising a first end and a second end,
• a first fastener configured to extend through the hub arm lug and a first aperture of the tension-torsion strap and to couple the first end of the tension-torsion strap to the hub arm, and
• a second fastener configured to extend through a blade lug of the rotor blade and a second aperture of the tension-torsion strap and to couple the second end of the tension-torsion strap to the rotor blade;
• and
• a pitch bearing assembly arranged around the hub arm and disposed within a blade inner cavity of the rotor blade, the pitch bearing assembly comprising:
• a first pitch bearing;
• and
• a second pitch bearing.

A method for installing a tension-torsion assembly of a rotor blade retention assembly, the method comprising:

• inserting an inboard end of a tension-torsion strap into a hub arm cavity of a hub arm;
• inserting an inboard blade pin into a hub arm lug and an inboard pin hole of the tension-torsion strap;
• sliding a rotor blade over the hub arm arranged around the inboard end of the hub arm;
• and
• installing an outboard blade pin assembly into a blade lug of the rotor blade and into an outboard pin hole of the tension-torsion strap.