[Chad C. Mulligan]

Gas turbines were not considered internal combustion when I was hatched as a baby engineer. How time change.

[ProtectOurFreedom]

Correct. Gas turbines use EXTERNAL combustion. That has not changed. The author goofed.

[redfreedom]

That’s arguable. According to Kawasaki: “Just like a diesel or gasoline engine, a gas turbine is a type of internal combustion engine and operates using the cycle of intake, compression, combustion (expansion) and exhaust. One major difference, however, is that the basic movement. A gas turbine is rotary movement, in contrast to the back-and-forth movement of a reciprocating engine.”

https://global.kawasaki.com/en/energy/equipment/gas_turbines/outline.html

When I was a hatchling an external combustion engine was the steam engine, which were nearly all phased out when I was in grade school. I recall my dad bringing to our attention one of the last Great Northern steam locomotives still working in the mid-50’s. Steam engines for farming were completely replaced by gas IC tractors a little earlier.