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Re:The $20 an hour Cessna 172 experiment by bluGill on Thursday February 09, 2023 @02:58PM (#34730383)
You need to get the whole airframe certified to change the engine. If the airplane hasn't been in production for 40 years+ who will pay for that? Does the engineering data needed to start that process even exist anymore?
Re:The $20 an hour Cessna 172 experiment by UniverseHacker on Thursday February 09, 2023 @05:30PM (#34732597)
Interestingly, I found that the airplane in question here, the Cessna 172 was actually sold with the Thielert / Continental diesel, but ended up cancelling it because they were so much more expensive than the gasoline models that nobody bought them:

https://en.wikipedia.org/wiki/Cessna_172#Special_versions