table: 1-1123802-1
columns: Engine, Power, continuous, Critical altitude This is the highest altitude at which the engine can achieve its full continuous power rating. Above this altitude, power falls off with height as with a naturally aspirated engine . See Supercharger#Altitude effects for details., Power, takeoff, Compression ratio, Supercharger gear ratio, Octane rating, Dry weight
Q: When critical altitude is sea level, what is the compression ration for a supercharger gear ratio of 7:1?
A: SELECT Compression ratio FROM 1-1123802-1 WHERE Critical altitude This is the highest altitude at which the engine can achieve its full continuous power rating. Above this altitude, power falls off with height as with a naturally aspirated engine . See Supercharger#Altitude effects for details. = 'sea level' AND Supercharger gear ratio = '7:1'