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Introducing A New Jet Engine?  
User currently offlineNASOCEANA From United States of America, joined Jul 2005, 291 posts, RR: 0
Posted (7 years 4 months 1 week 4 days 3 hours ago) and read 2361 times:

Can anyone explain the development and introduction of a new jet engine (GEnx) to the marketplace? Are the development and production cost similar to that of an airline company? Can the development cost run into the billions of dollars for a new model of aircraft engine and take years to develop? I heard that the cost of the engines on a plane can be half of the purchase price.

Thanks for any input!

NASOCEANA


B777 greatest Airliner ever built!
1 replies: All unread, jump to last
 
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6389 posts, RR: 54
Reply 1, posted (7 years 4 months 1 week 1 day 10 hours ago) and read 2208 times:

Huh, what is a "new" engine? A really all new engine for large airliners has hardly been designed for 30 or 35 years.

I would consider the following engines "new" designs: P&W JT9D, GE TF-39, RR RB-211, GE F101, P&W F100. And to that we can add half of a new engine, the SNECMA M56.

They can be considered the grandfathers of present day PW 40xx, GE CF6, GE90, GP7200, RR Trent, CFM56 and (maybe slightly less) the IAE V2500.

If we have to pick one really new engine during the last 30+ years, then the ill fated PW6000 probably comes closest. Its development went years and billions over budget.

When the first A380 took to the air a couple of years ago on it's four RR Trent 900 engines, then those engines had been under development for five years, but were still considered preliminary test engines. A substantial amount of hardware, things which should make those engines really operational in everyday use and give the planned redundancies in failure modes, were not available yet at that time. The Trent 900 it a little more than a refined Trent 800 since it's the first triple spool engine in the world with contrarotating core.

You mention GEnx. It's definitely a refinement and development of the GE90.

Like with cars, different and improved models are produced every now and then. Sometimes it gets a new name, sometimes only a different numeric or alphanumeric code as a suffix to the name. For instance one of the more massive changes to an existing engine was some 20 years ago when the CFM56-5C2 was produced on the basis of the CFM56-5A3. Other engines have got a new name based on much less change.

But in any case, when another engine variant is produced, based on substantial hardware changes and improvements (like for instance GEnx or RR Trent 1000/1700), and not just FADEC software updates based on a previous model, then a billion dollars are hardly peanuts, but much less will it cover a total bill. Development and certification takes several years.

I doubt that there are airliners out there on which the engines are fully 50% of the procurement costs. Most will have the engines in the 25 to 33% range. But in any case those hair dryers are not cheap. Just one GE90-115B will probably retail around $20 million.



Always keep your number of landings equal to your number of take-offs, Preben Norholm
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