Winglet and winglet cover assembly

A winglet comprising first and second covers, a front spar, a rear spar, a rib, and a mid spar between the front spar and the rear spar;

• wherein:
• the rib and each spar are joined to the first cover and to the second cover;
• the mid spar has a length and the mid spar curves along all or part of its length;
• the length of the mid spar extends from a terminal inboard end of the mid spar to a terminal outboard end of the mid spar;
• the rib comprises a recess bounding the terminal inboard or the terminal outboard end of the mid spar;
• wherein the rib comprises a web, a first flange joined to the first cover, and a second flange joined to the second cover;
• and,
• wherein the web is in a facing relation to the terminal inboard or the terminal outboard end of the mid spar, and wherein the mid spar does not extend through the web.

A winglet cover assembly comprising:

• a cover, a front spar, a rear spar, a rib, and a mid spar between the front spar and the rear spar;
• wherein:
• the rib and each spar are joined to the cover;
• the mid spar has a length and the mid spar curves along all or part of its length;
• the length of the mid spar extends from an inboard end of the mid spar to an outboard end of the mid spar;
• the rib comprises a web, a first flange joined to the first cover, and a second flange joined to the second cover;
• and
• wherein the mid spar comprises a terminal end in a facing relation to and terminating at the web of the rib without extending through the web, so the web faces the inboard or outboard end of the mid spar;
• and
• the rib wraps around the inboard or outboard end of the mid spar, or the rib comprises a recess bounding the inboard or outboard end of the mid spar.