F-104CCV (control configured vehicle) 98+36 showing the two tails Phase 2: E1-Configuration: basic aircraft plus 240 kg trim weight in the nose section modification with the canard control surfaces a complete F-104 tailplane section was then grafted to the spine on the upper fuselage drag chute compartment reinstalled first flight on November 20, 1980 with neutral stability flights 77-83, last flight February 20, 1981 E2-Configuration: basic aircraft plus 400 kg trim weight (tail ballast) in the tail section drag chute compartment was taken out and a trim weight compartment was added under the tail section first flight on July 17.1981 flights 84-110, last flight September 30, 1981 E3-Configuration: basic aircraft plus 600 kg trim weight (tail ballast) in the tail section first flight on October 1.1981 first flight with 20% negative stability January 28, 1982 flights 111-118, last flight January 28, 1982. copyright © EADS archive