Experiments showed the need for only a small number of design changes, mainly involving the wing profile and positioning. To improve high-alpha performance, the leading edge of the wing was drooped, especially on outer sections, a dog-tooth was introduced at about half-span to control spanwise flow,  and the entire wing given a slight negative camber which helped control trim drag and pitch-up.  The area rule principle, made public in 1952, was also applied to the design. This resulted in several changes including the addition of a tailcone, sharpening the radar nose profile, thinning the intake lips, and reducing the cross-sectional area of the fuselage below the canopy. 
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Arriving at Tangiers , the family was met by London Times journalist Walter Harris , an old school friend of Indiana's father staying in the country. Harris had arranged for the Joneses to meet with the Sharifa Emily Keene and while the adults conversed, Indiana was allowed to play outside with Keene assigning Omar , one of her slaves, to keep Jones company. During the game Indiana found he had to tell Omar not to let him win but complimented the boy on his English and discovered the boy didn't have to study like he. Jones considered the slave be lucky and Omar, like their game had been, accepted the point without argument.