The tube running fore and aft on the wing. A deep pocket joining the rear of the keel to the sail proper on earlier wing designs to aid handling. The vertical tube above the wing to provide support for negative air and ground loads. These are in bending mode in flight and are designed to flex. This aids in handling.
Many trikes have a drum brake on the front wheel, activated by a lever on the left hand foot peg.
The cable or strap from the spreader junction to the rear of the keel that holds the spreaders back. Reflex Bridle Wires or lines from the top of the kingpost to the rear of the inner battens. Designed to create an up-elevator effect at low angles of attack. On some trikes these can be tightened in flight to provide in-flight tr im. If trike nosewheel steering is messed up on landing, the result is usually the trike doing a nose-flip and rolling over on one leading edge, resulting in a broken leading edge, prop, keel, mast and universal at the very least.