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P-2 Neptune vs SR-71 Blackbird

P-2 Neptune vs SR-71 Blackbird at a glance — top speed 584 vs 3,541 km/h, range 3,471 vs 5,230 km, max takeoff weight 36,240 vs 78,018 kg, built 1,177 vs 32 units.

Specifications
P-2 Neptune SR-71 Blackbird
Origin country 🇺🇸 United States 🇺🇸 United States
Category Military Special Mission Aircraft Military Special Mission Aircraft
Manufacturer Lockheed Lockheed
First flight 17 May 1945 22 December 1964
Year introduced 1947 1966
Number produced 1177 units 32 units
Average unit price -- $185 million
Wing area 92.9 m² 167.0 m²
Wingspan 31.7 m 17.0 m
Height 8.9 m 5.7 m
Length 27.9 m 32.8 m
Maximum speed 584 km/h 3541 km/h
Operational range 3,471 km 5,230 km
Service ceiling 6,828 m 25,908 m
Max. takeoff weight 36,240 kg 78,018 kg
Empty weight 22,650 kg 30,617 kg
Total thrust 2 x 2,759 kW 2 x 15,422 kgf
Performance Radar Chart
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Frequently Asked Questions

Which is faster, the P-2 Neptune or SR-71 Blackbird?
The SR-71 Blackbird is faster with a maximum speed of 3,541 km/h compared to the P-2 Neptune's 584 km/h, a difference of 2,957 km/h.
Which has longer range, the P-2 Neptune or SR-71 Blackbird?
The SR-71 Blackbird has a longer range at 5,230 km compared to the P-2 Neptune's 3,471 km.
Which can fly higher, the P-2 Neptune or SR-71 Blackbird?
The SR-71 Blackbird has a higher service ceiling at 25,908 meters (85,000 ft) compared to the P-2 Neptune's 6,828 meters (22,401 ft).
Which is heavier, the P-2 Neptune or SR-71 Blackbird?
The SR-71 Blackbird has a higher maximum takeoff weight at 78,018 kg compared to the P-2 Neptune's 36,240 kg.
Which is larger, the P-2 Neptune or SR-71 Blackbird?
The SR-71 Blackbird is longer at 32.8 meters compared to the P-2 Neptune's 27.9 meters.
Which entered service first, the P-2 Neptune or SR-71 Blackbird?
The P-2 Neptune entered service first in 1947, 19 years before the SR-71 Blackbird which entered service in 1966.
Which has been built in greater numbers, the P-2 Neptune or SR-71 Blackbird?
The P-2 Neptune has been produced in greater numbers with 1,177 units compared to 32 units of the SR-71 Blackbird.