October 28, 2020
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GE tests demonstrator engine
General Electric has completed testing a 35%-additive manufactured demonstrator engine designed to validate additive parts in its clean-sheet-design Advanced Turboprop (ATP), which will power the all-new Cessna Denali single-engine turboprop aircraft. Additive components reduce the ATP’s weight by 5% while contributing a 1% improvement in specific fuel consumption (SFC). An additive CT7-2E1 technology demonstrator engine, dubbed the “a-CT7,” was designed, built and tested in 18 months, reducing more than 900 subtractive manufactured parts to 16 additive manufactured parts. The ATP engine architecture is derived from the CT7, allowing for part commonality between the two additive test programs. The ATP will utilize more additive parts than any production engine in aviation history; 855 subtractive manufactured parts will be reduced to 12 additive parts. Additive components constitute 35% of the ATP’s total part count.