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In reading responses to my thread (plug), I came across a reference to a proposed twin L1011, called Bi-Star or Dash 600.
Googling turned up this:
So, WI the 747 had been a trijet, or the 737 had been a jumbo? (One or the other is never designed or built.)
Does this butterfly the L1011 & DC-10? Or does it make them more successful? Does this mean the *73½7 (IDK what to call it) is the #1-selling jetliner in history? Or does being a jumbo hurt its sales?
Does a need for 3 engines, instead of four, mean all three have to be bigger & more powerful?
Does it get caught by regulators disapproving of fin-mounted engines?