Shelby conferred with an aerodynamics consultant from Convair who said that the design needed to be extended on the tail by at least 3 feet ( 0.91 m ) .
Brock stood by his design .
Shelby conferred with an aerodynamics consultant from Convair who said that the design needed to be extended on the tail by at least 3 feet ( 0.91 m ) , but Brock stood by his design .