 Despite imposing dimensions and a maximum takeoff weight of over 60 @,@ 000 lb ( 27 @,@ 000 kg ) , the F @-@ 4 has a top speed of Mach 2 @.@ 23 and an initial climb rate of over 41 @,@ 000 ft / min ( 210 m / s ) . The F @-@ 4 's nine external hardpoints have a capability of up to 18 @,@ 650 pounds ( 8 @,@ 480 kg ) of weapons , including air @-@ to @-@ air and air @-@ to @-@ surface missiles , and unguided , guided , and thermonuclear weapons . Like other interceptors of its day , the F @-@ 4 was designed without an internal cannon . 
