PERCENT 
POWEFI 
CONSTANT 
AIRFLOW 
BEST 
OVERLEAN WER-RICH 
NAVWEPS 00-307-80 
AIRPLANE PERFORMANCE 
I FUEL-AIR RATIO 
NORMAL COMBUSTION 
SPARK 
PLUG 
DETONATION 
FLAME PROPAGATION 
BURNJNG IGNITION 
FROM HOT SFfYT 
NORMAL CCMBUSTION 
COMPRESSION STROKE POWER STROKE 
TOP CENTER :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::~:::::::::::::::::::::::::::~:::::::::::::::::::::::::::::::::::::::::::::::::::::::::~.:::::::~::::::::::::::~~~~~~~~~~~~~~~~~~~~~~ ::::::::::::::::::::::::::::::::::::::::::~::::~:::::::::::::::::::::::::::::::::::::::::::::::::::~::::::::::::::::::::::::::::~:::::::::::::::::::::::::::::::::::::::::::::::::::...~.............., . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ .._..______._.,,.,.,,...................,......................,,...............,..... . . . . . . . . . . . . . . . 
MAXIMUM 
1 RATED TAKEOFF 
CRUISE POWER 1 1 POWER 
DETONATION 
ENGINE AIRFLOW, LBS. PER HR. 
Figure 2.16. Reciprocating Engine Operation 
139