Quote: GE Aviation is working with NASA on a wind-tunnel test program to evaluate counterrotating fan-blade systems for an "open rotor" engine design that hearkens back to their joint efforts a quarter of a century ago.
Testing will begin at NASA's Glenn Research Center in Ohio in early 2009 and continue into mid-year, GE said. The company noted that "this is not a full engine test, but a component rig test to evaluate subscale fan systems using GE's and NASA's advanced computational tools and data acquisition systems."
Any speculation on which one will be better (GTF or Open Rotor) in economics.
Mt guess is the open rotor will have better fuel economy than the GTF, however open rotor will be very much noisier, so I suspect that the GTF will still get the majority of industry interest in the world of airport noise restrictions in which we live. Not saying open rotor has no future, just that it has further to go before it will be able to compete effectively.
Wingscrubber From UK - England, joined Sep 2001, 862 posts, RR: 0
Reply 3, posted (7 years 6 months 5 days ago) and read 4918 times:
Sounds more like a next-gen turboprop than competition for the GTF. I think they will have very different efficient flight ranges, but both have potential. I believe the GTF will have the edge in the transonic flight regime - that's where the duct will help.