P-39 "Airacobra"
P-39Q-25
AEC:
Overheats in about the same place as the Q-5 (around H3). With the addition of an extra propeller blade it does accelerate faster however its top speed is unchanged. So with the already good energy retention and the slightly better thrust I'm able to stay in the 290-310 mph range which is far far better than the Q-5. Still is an overall downgrade compared to the N-0.
MEC:
The P-39Q-25 can "infi-wep" at 90% prop pitch and 20% radiator. Any attempts to improve upon this result in the engine overheating and the pilot being stuck in an overheat cycle, thus ruining any attempts to save time by using less radiator. At least the airframe is consistent and easily predictable.