The Penetrators The purpose of the test was to determine the impact force, versus time, due to the impact, of a complete F-4 Phantom — including both engines — onto a massive, essentially rigid reinforced concrete target (3.66 meters thick). Previous tests used F-4 engines at similar speeds. The test was not intended to demonstrate the performance (survivability) of any particular type of concrete structure to aircraft impact. The impact occurred at the nominal velocity of 215 meters per second (about 480 mph) McDonnell Douglas F-4 Phantom II Lunghezza 19,2 m Apertura alare 11,7 m Altezza 5 m Peso A vuoto 13.770 kg Normale 18.865 kg Massimo al decollo 28.090 kg