Assertion: civil turbofan | /r/HasProperty | the rb211 and trent families
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Source sentences:
text: Rolls-Royce chose a three-spool configuration for their large civil turbofans (i.e. the RB211 and Trent families), where the T-stages of the boosted two-spool configuration are separated into a separate intermediate pressure (IP) spool, driven by its own turbine.