Only 24 inches long, the TRS 18 is still the smallest jet engine ever to power a manned aircraft.
How much does a small jet engine cost?
And then there are so many different types of engines, which each have their own thrust rating. Roughly speaking, an engine can cost anything from 12 to 35 million dollars.
Why are small jet engines so expensive?
Jet engines are so expensive, because they are getting more and more sophisticated and fuel efficient. After landing the A380, the controls to shutdown the engine were not working. Firefighters tried for hours to shutdown the number 1 engine without success.
How much fuel does a small jet engine use?
Small engines that are around 65 HP burn 2.5 3 gallons per hour. Those engines with 400 HP burn about 20 GPH in cruise mode. It is still exponentially lesser than that of a commercial aircraft. For instance, a Boeing 747 uses 1 gallon of fuel per second!