The Lockheed L-1011 TriStar had a unique S-duct air intake for its tail engine (No. 2 engine). Instead of mounting the engine on the tail like the DC-10, it was placed inside the fuselage. ✅ S-duct benefits: - Less drag → More fuel-efficient ✈️ - Better balance → Stable flight ⚖️ - Quieter → Less noise 🔇 This design made the L-1011 advanced, but it had limited success due to financial issues.


 The Lockheed L-1011 TriStar had a unique S-duct air intake for its tail engine (No. 2 engine). Instead of mounting the engine on the tail like the DC-10, it was placed inside the fuselage.


✅ S-duct benefits:

- Less drag → More fuel-efficient ✈️

- Better balance → Stable flight ⚖️

- Quieter → Less noise 🔇


This design made the L-1011 advanced, but it had limited success due to financial issues.

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