Editing Concorde (section)

===Ogee planform selected===
Küchemann and others at the RAE continued their work on the slender delta throughout this period, considering three basic shapes - the classic straight-edge delta, the "gothic delta" that was rounded outward to appear like a [[Gothic architecture#Equilateral arch|gothic arch]], and the "[[ogive|ogival]] wing" that was compound-rounded into the shape of an [[ogee]]. Each of these planforms had advantages and disadvantages. As they worked with these shapes, a practical concern grew to become so important that it forced selection of one of these designs.{{sfn|Owen|2001|p=40}}

[[File:Bristol Type 223 top-view silhouette.png|thumb|Plan-view silhouette of the Bristol Type 223 SST project]]
Generally, the wing's [[Center of pressure (fluid mechanics)|centre of pressure]] (CP, or "lift point") should be close to the aircraft's [[centre of gravity]] (CG, or "balance point") to reduce the amount of control force required to [[Pitch axis (kinematics)|pitch]] the aircraft. As the aircraft layout changes during the design phase, the CG commonly moves fore or aft. With a normal wing design, this can be addressed by moving the wing slightly fore or aft to account for this. With a delta wing running most of the length of the fuselage, this was no longer easy; moving the wing would leave it in front of the nose or behind the tail. Studying the various layouts in terms of CG changes, both during design and changes due to fuel use during flight, the ogee planform immediately came to the fore.{{sfn|Owen|2001|p=40}}

To test the new wing, NASA assisted the team by modifying a [[Douglas F5D Skylancer]] to mimic the wing selection. In 1965, the NASA test aircraft successfully tested the wing, and found that it reduced landing speeds noticeably over the standard delta wing. NASA also ran simulations at Ames that showed the aircraft would exhibit a sudden change in pitch when entering ground effect. Ames test pilots later participated in a joint cooperative test with the French and British test pilots and found that the simulations had been correct, and this information was added to pilot training.<ref>Memoirs of an aeronautical engineer: flight testing at Ames Research Center. Seth B. Anderson, United States. National Aeronautics and Space Administration. History Office, Ames Research Center. p. 38</ref>