[Platapus]

Originally Posted by Sailor Steve

The Phantom II has always amazed me. .... It had a fairly poor thrust/weight ratio, which gave it mediocre acceleration and climb

Despite the imposing dimensions and a maximum takeoff weight of over 60,000 pounds (27,000 kg), the F-4 was capable of reaching a top speed of Mach 2.23 and had an initial climb rate of over 41,000 feet per minute (210 m/s). Shortly after its introduction, the Phantom set 16 world records, including an absolute speed record of 1,606.342 miles per hour (2,585.086 km/h), and an absolute altitude record of 98,557 feet (30,040 m). Although set in 1959-1962, five of the speed records were not broken until 1975.

http://www.guideall.com/f4phantom.htm

To show off their new fighter, the Navy led a series of record-breaking flights early in Phantom development: All in all, the Phantom set 16 world records. With the exception of Skyburner, all records were achieved in unmodified production aircraft. Five of the speed records remained unbeaten until the F-15 Eagle appeared in 1975.

• Operation Top Flight: On 6 December 1959, the second XF4H-1 performed a zoom climb to a world record 98,557 ft (30,040 m). The previous record of 94,658 ft (28,852 m) was set by a Soviet Sukhoi T-43-1 prototype. Commander Lawrence E. Flint, Jr., USN accelerated his aircraft to Mach 2.5 at 47,000 ft (14,330 m) and climbed to 90,000 ft (27,430 m) at a 45° angle. He then shut down the engines and glided to the peak altitude. As the aircraft fell through 70,000 ft (21,300 m), Flint restarted the engines and resumed normal flight.
• On 5 September 1960, an F4H-1 averaged 1,216.78 mph (1,958.16 km/h) over a 500 km (311 mi) closed-circuit course.
• On 25 September 1960, an F4H-1 averaged 1,390.21 mph (2,237.26 km/h) over a 100 km (62.1 mi) closed-circuit course.
• Operation LANA: To celebrate the 50th anniversary of Naval aviation (L is the Roman numeral for 50 and ANA stood for Anniversary of Naval Aviation) on 24 May 1961, Phantoms flew across the continental United States in under three hours and included several tanker refuelings. The fastest of the aircraft averaged 869.74 mph (1,400.28 km/h) and completed the trip in 2 hours 47 minutes, earning the pilot (and future NASA Astronaut), Lieutenant Richard Gordon, USN and RIO, Lieutenant Bobbie Young, USN, the 1961 Bendix trophy.
• Operation Sageburner: On 28 August 1961, a Phantom averaged 902.769 mph (1,452.826 km/h) over a 3 mi (4.82 km) course flying below 125 feet (38.1 m) at all times. Commander J.L. Felsman, USN was killed during the first attempt at this record on 18 May 1961 when his aircraft disintegrated in the air after pitch damper failure.
• Operation Skyburner: On 22 December 1961, a modified Phantom with water injection set an absolute world record speed of 1,606.342 mph (2,585.086 km/h).
• On 5 December 1961, another Phantom set a sustained altitude record of 66,443.8 feet (20,252 m).
• Operation High Jump: A series of time-to-altitude records was set in early 1962: 34.523 seconds to 3,000 meters (9,840 ft), 48.787 seconds to 6,000 meters (19,700 ft), 61.629 seconds to 9,000 meters (29,500 ft), 77.156 seconds to 12,000 meters (39,400 ft), 114.548 seconds to 15,000 meters (49,200 ft), 178.5 seconds to 20,000 meters (65,600 ft), 230.44 seconds to 25,000 metres (82,000 ft), and 371.43 seconds to 30,000 metres (98,400 ft).

• 
  

https://en.wikipedia.org/wiki/McDonnell_Douglas_F-4_Phantom_II


Mediocre acceleration and climb eh?

I do not think that word means what you think it means.