Pas trouvé de sujet dédié donc je débute avec un post intéressant de Lightsaber sur Airliners sur les moteurs de jets privé:
http://www.airliners.net/forum/viewtopic.php?f=3&t=1359465#p19451889
http://www.airliners.net/forum/viewtopic.php?f=3&t=1359465#p19451889
Lightsaber a écrit:Business jet resale is poor without a service plan. Larger business jets pay just under $300 per takeoff for the plans (less for smaller engines, but not a lot less). But with only 100 to 200 takeoffs a year, the engines have to go out the door paying for R&D and a profit.
That said, most business jet engines are rebuilt twice over their life. But that is twice in 40 years! Counting each rebuild (not per engine): First engine at about 5 years at about 12 years the 2nd engine is overhauled. 3rd at a 20 to 25 years, and the last rebuild at 30+ years of service. Generally, when the next engine rebuild is required, the plane is scrapped when the 5th is due as it isn't worth putting that kind of money in an ancient airframe.
Once it is decided to only rebuild one engine, the service plans are a poor investment. This creates a economic death spiral for old engines.
Business jet engines need to cut development costs and share the core or there is no profit. Besides your examples:
The BR700 family was expanded to 3 models, including an attempt on the 717 to gain economies of scale.
The PW800 uses the C-series core to attain economies of scale. It will also be sold at 16k and 12k variants.
The passport will be part of a larger engine family. Starting large allows for a higher thrust RJ engine (higher bypass) and a lower thrust option. The current passport is a BR725+ with room for a lower thrust variant. But not below about 15k (it is just a larger engine).
The Silvercrest will eventually grow with smaller thrust versions. I expect it to dominate the 8k to 12k category as the smaller PW812 is a million dollars more per engine. As capable as it is, that expensive pw800 c-series high spool optimized for civil duty costs too much. It needs expensive secondary systems too (increases the maintenance costs in low utilization duty). So expect the Silvercrest to be around a long time despite a rough start.
The PW300 and competing Allisons have been on numerous platforms gaining technology with each revision. However, I believe the advantage will go to the new Silvercrest.
I am excited about the engine selection for the 9X (Silvercrest's to lose), Global 6000 upgrade, possible Challenger 6XX and 3XX re-engine, as well as the next Embraer.
And Gulfstream will continue to invest. After the 3rd P42 (PW812 launch platform), I expect a G650 improvement/stretch. Either a BR700NG or the Passport.
I also expect Cessna to keep moving upmarket.
Lightsaber