A modular wing portion for installation into a wing assembly as a pre-assembled unit, the modular wing portion comprising at least one rib and at least one internal fuel tank system component, and a cartridge jig for the assembly of the modular wing portion away from an aircraft wing, the cartridge jig comprising a plurality of secondary support members, each secondary support member configured to receive and support a rib such that a fuel system component can be installed to the rib. Also an aircraft and wings, transport frames and methods of assembly.

A modular wing portion for installation into a wing assembly as a pre-assembled unit, the modular wing portion comprising at least one rib and at least one internal fuel tank system component, and a cartridge jig for the assembly of the modular wing portion away from an aircraft wing, the cartridge jig comprising a plurality of secondary support members, each secondary support member configured to receive and support a rib such that a fuel system component can be installed to the rib. Also an aircraft and wings, transport frames and methods of assembly.

A compact fixed wing aircraft which may be folded or partially disassembled for ease of storage or transport. The aircraft engine(s) may telescopically slide into the fuselage for ease of transport or storage. The aircraft may feature two engines powering separate propellers in a coaxial counter-rotating propeller assembly. The aircraft may feature manufacturing improvements including load bearing truss structures cut from single sheets or plates of metals, the use of high strength metals, or the use of solid polymer sheets as a surface covering.