Jet Engine Specifications?

Question

If two aircrafts have the exact same specifications "Size, Fuel Capacity, Weights...etc." but have two different Jet Engines, what specifications to look for in the engine to choose the best performance - most economic aircraft.

Answer 1

You will need to know the average fuel burn in various flight configurations and the various typical projected flight profiles. You would also need to know the type of fuel which will be used, since various fuels/grades carry different prices. Based on this, you could calculate the cost of fuel (only) per passenger/mile. This would, however, be only one of the very many aspects which would have to be taken into consideration for deciding the 'most economic' aircraft.

Maintenance would be a major overhead which would need looking into very carefully. The cost of routine servicing and maintenance alongwith costs of parts and consummables for such services should be taken in your costings. The time between overhauls (TBO) and the downtime factor during such periods (including overhauling costs) should be noted.

There is so much more which goes into this exercise but cannot be covered in YA.

See if the above can help, and please do come back if you need anything specific. All the best of luck.

PS: Phoenix - check the "Specific Fuel Consumption" for each of the engines. If I understand correctly, this is what you had in mind when you asked your question.

Answer 2

BUY A GLIDER WELL GOOD FUEL ECONOMY

Answer 3

I would try the company website of the aircraft manufacturer.  If you order say, a Challenger with different engines, it may tell you the difference in fuel consumption.  Of course, many corporate jets only come with one engine choice.  Larger aircraft often have more choices of engine manufacturers.  Also, aircraft is plural, there is no such word as aircrafts.  Just an FYI.

Answer 4

If your basing fuel economy on engines, do yourself a favor and stay out of jet managing. Altitudes, Max weights, and TYPE of flying determine fuel burn more than anything. Short legs, long legs, flying at 45K or 28K. Many factors that change consistently will give you what your asking. Dont forget reliability of mechanical parts as well that will affect cost structures.

Answer 5

The POH should have information in it that can help you determine economy.  You might find a local CFI and get their input on the two specific aircraft.