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				| 1. | A prop-driven aircraft is cruising with 90% propeller efficiency. If, range of aircraft is 7*106 ft, C=1.38*10-7 s-1 and L/D = 14 then what will be the fuel weight fraction for the cruise? | 
| A. | 0.9216 | 
| B. | 0.9261 | 
| C. | 0.9289 | 
| D. | 0.9365 | 
| Answer» C. 0.9289 | |