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Based on a single article as listed below.

This piece discusses the immense technical and economic challenges associated with developing new commercial jet engines, highlighting the fact that exceptional performance is required at a relatively low cost for commercial viability. The text explains how these demands necessitate continual technological advancement and precision engineering, citing examples of historical engine development struggles, such as those encountered by Rolls-Royce with the RB211 and Pratt and Whitney with the J57. Ultimately, the article emphasizes that successfully creating a competitive commercial jet engine is a multi-billion dollar undertaking that requires pushing the boundaries of what's technologically possible, leading to significant development timelines and high risks.

Source:

An article titled "Why it's so hard to build a jet engine". It was written by Brian Potter and published on Feb 28, 2025. The publication is listed as Construction Physics