[THE ESCHATOLOGIST]

]
According to all these links, the Airacomet flew in 1942. Do you know when the P-51 and P-47 reached their prime? Or the late-war Spitfire models, the Tempest, etc?

Repeating what Radoye said:

The P-51B's first deliveries were made in 1942 and it could go 441mph. The earlier P-51A was doing 409mph.
Spitfire IX, also 1942, 408mph.
Typhoon IA (the older sibling of the Tempest) introduced in 1941, 405mph.
P-47B, introduced 1942, 429mph.

All single piston engined fighters available to Allied frontline operational units at the time of Airacomet's first flight. All in the same ballpark performance-wise with this twin-jet prototype. ....