The A4 Skyhawk is a light-weight aircraft with a maximum takeoff weight of 24,500 pounds (11,100 kg) and has a top speed of more than 600 miles per hour (970 km/h). The aircraft's five hardpoints support a variety of missiles, bombs and other munitions and was capable of delivering nuclear weapons using a low altitude bombing system and a "loft" delivery technique. Prior to the A-4E, power was supplied by the Wright J65 engine; on the A-4E, the J65 was replaced by the Pratt & Whitney J52.