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It started when I was reading this post on a twin engine version of the L-1011 in another thread:
Actually, what saved the TriStar program was Rolls-Royce offering the much more powerful Trent 700 engine, which made it possible for Lockheed to build a twin-engine version of the plane by 1988. The L-1022, as the plane is known today, built with ETOPS certification in mind and had ranges of 5,600 nautical miles for L-1022-200 longer version and 6,400 nautical miles for the L-1022-100XR shorter version (OOC: it duplicated what Airbus did with the A330), and Lockheed couldn't keep up with demand.

then I watched this video on the L-1011:
In the video, it mentions Frank Kolk's concept for a smaller widebody plane as an alternative to the 747.

So it got me wondering: what if instead of three engines, the L-1011 was designed from the start as a twin engine widebody airliner specifically made for domestic routes in the US? A twin engine design would certainly have some advantages (reduced weight, maintenance and fuel consumption plus fewer restrictions on engine mounting). Would such a plane be possible (or feasible) at the time? Also, could such a plane be more successful than OTL's Tristar?
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