I was just curious as to why Delta has both engine types. I know the non ER 767s with the exception of 4 or 5 are GE powered. Is one type used on certain routes. Is there a noticable difference in performance
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Quote:
Originally Posted by n287hg
I was just curious as to why Delta has both engine types. I know the non ER 767s with the exception of 4 or 5 are GE powered. Is one type used on certain routes. Is there a noticable difference in performance
I don't work for Delta. Pratts take a lot longer to start. especially in cold weather. The Pratts on an MD11 put out about 2,000 more pounds of thrust than do the General Electrics. Both are good engines, but the PW are much harder to sync when using auto-throttles.
fbh
The domestic 767s were ordered with the small engines because they didn't need big engines to lift a light airplane with half the gas of an ER. That said, the GEs start quickly but that's it for me. The GEs are temp sensitive so you are always taking off unpressurized vs. the Pratts. I like our big Pratt domestic 767s. The domestic GEs are dogs for climb out. Now, get a ER on a domestic flight and the big engines really shine. One of my best time to climb was in an ER from JFK to ATL. We climbed to FL360 in 9 minutes at .80 in the climb. Still doing 4000 FPM at level off. Of course, it was winter time so were minus ISA which helped.
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they are beefy
We took an MD11 w/ P&Ws from SL to FL430 once (the Captain wanted to see how it would climb, as we were repositioning the a/c). She climbed like a homesick angel! Leveled off 11 minutes after rotation. It was an eye opener.
fbh
At my airline 14 of 18 763's are PW powered. We picked up 4 non ER examples from DL which are GE powered. You can really feel the difference on take off and climb. We usually stick the non ER versions on Hawaii to West Coast runs. Once in awhile one of the non ER birds will show up on the LAS run, but temprature permiting.
i took my PW powered DC-3 to 9000 feet in 30 minutes one fine summer day,when we finally leveled off i ignited a cigar to celebrate ! no lie, you 767 guys are blessed with a kick butt airchine !
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AA has the "big" GEs on the 300ERs (63k). The 200ERs have the smaller GEs.
No complaints on the GEs, but then again, I never flew Pratts. The 300ERs do absolutely outstanding, probably much like the Pratts. Very nice power to weight ratio, climbs great even at 400K going from JFK-EZE. The 200ERs are not bad, but you can tell the difference - doesn't matter, since we only use those on domestic.
Our ex TWA 757s had Pratts, vs our RR-powered 757s. The Pratts had less power than the RRs but reverse was much more effective, so was taxi, due to the bigger fan. The RRs are absolutely overpowered and give the engine a nice sleek look vs. the bulbous Pratts. JMO.
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