I'm not sure why it didn't show up on other biz-jet engines. Small jets tend to have lower bypass ratios, where the GTF
advantage isn't as large, so it's easier for a non-GTF
to compete with a GTF
. It's the diameter mismatch between the fan and the turbine that causes the fundamental problem that the GTF
is trying to resolve. On a biz jet engine, that mismatch isn't near so bad.
|Quoting Faro (Thread starter):|
Or was this first GTF implementation much less attractive/efficient than what PW is proposing with their PW1000G?
I would hope the efficiency is better on the PW1000G because of the higher bypass. However, the major achievement of what Pratt has done is the scale up. Gearboxes at the biz jet size aren't really any more challenging that gearboxes on turboprops, which have been around for a very long time. It's the scale-up to the power levels required for modern turbofans that's been the challenge, and has consumed decades of research at Pratt.