Patent ID: 11919620
Assignee: TEXTRON INNOVATIONS INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method of constructing a foldable spar assembly, comprising:
providing a common spar, comprising:
a tip comprising a most outboard portion of the spar;
a root comprising a most inboard portion of the spar;
a main section disposed inboard relative to the tip that is comprised exclusively of curved surfaces; and
a middle section disposed inboard relative to the main section, the middle section comprising a first set of opposing flat outer surfaces and a second set of opposing flat outer surface situated laterally between and substantially perpendicular to the first set of opposing flat outer surfaces;
wherein the first set of opposing flat outer surfaces are configured to accommodate bolt holes for a nonfoldable spar assembly;
wherein the second set of opposing flat outer surface are configured to accommodate tang holes for a foldable spar assembly; and

joining the main section and the middle section using a transition section, the transition section comprising an outboard interface cross-sectional shape and an inboard cross-sectional shape that is different than the outboard interface cross-sectional shape;
drilling holes through the second set of opposing flat outer surfaces, wherein the holes are coaxially aligned; and
removing the root and a majority of the first set of opposing flat outer surfaces.