The gear ratio of {HEAD ~ the planetary set} is preselected to reduce the input speed to {TAIL ~ the torque converter} while increasing the input torque to the torque converter so that the output of the one remaining engine is more efficiently matched to the torque converter 
The gear ratio of { HEAD ~ the planetary set } is preselected to reduce the input speed to { TAIL ~ the torque converter } while increasing the input torque to the torque converter so that the output of the one remaining engine is more efficiently matched to the torque converter
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH