Patent ID: 8850793

Claim:
A turbofan engine comprising: a fan; a compressor in communication with the fan section, wherein the fan is configured to communicate a portion of air into a bypass path defining a bypass area outwardly of the compressor and a portion into the compressor and a ratio of air communicated through the bypass path relative to air communicated to the compressor is greater than about 6.0; a combustor in fluid communication with the compressor; a turbine in communication with the combustor, the turbine having a first turbine section that includes two or more stages and a second turbine section that includes at least two stages, wherein a ratio of airfoils in the first turbine section to the bypass ratio is less than about 170 and the first turbine section includes a maximum gas path radius and a ratio of the maximum gas path radius to a maximum radius of the fan is less than about 0.50;and a speed reduction mechanism coupled to the fan and rotatable by the turbine.