Editing Lockheed L-1011 TriStar (section)

=== Engines ===
The [[Rolls-Royce RB211|RB211]] and its features, despite the delays in its development, provided the L-1011 with then-unmatched fuel economy and noise levels.<ref name=":0">{{Cite book|last=Upton, Jim.|url=https://www.worldcat.org/oclc/48491576|title=Lockheed L-1011 Tristar|date=2001|publisher=Specialty Press Publishers and Wholesalers|isbn=1-58007-037-X|location=North Branch, MN|oclc=48491576}}</ref>{{Rp|23}}

==== Reversers and nozzle ====
During development the RB211 engines on the L-1011 had ''thrust-spoilers'' – [[Target-type thrust reversal|target-type]] hot-stream reverse buckets – alongside the cold-bypass reversers. Despite capturing 25% of the total engine thrust, aerodynamic interference with the flaps diminished the braking effect of the flaps, so the thrust-spoilers were removed; instead an 11-degree afterbody was installed, which improved the specific range by 1.5%. Further improvements led to a 15-degree afterbody, enabling the L-1011 "to beat its predicted specific air range at 0.85 Mach by between 3.5 and 5.5 percent, the exact figure depending on cruise weight."<ref name=":0" />{{Rp|26–27}}