Furthermore, does anyone know how rpm affects engine life? I generally think of engine life being more affected by temperature than rpm, but I could well be wrong.
Yikes! wrote:Hi SteelChair: Typically, first stage HP turbine will be turning ~38,000 RPM at takeoff thrust. The geared turbofan at a substantially less RPM. During takeoff with a modern GTF installation, approximately 75% of the takeoff thrust comes from the fan. During cruise, only about 60% from the fan and 40% from the core thrust. I made a post here about 20 years ago (can't find it) giving the mathematics to those numbers. Feel free to search!
Engine life is more dependent on temperatures, not so much rpm's.
SteelChair wrote:Furthermore, does anyone know how rpm affects engine life? I generally think of engine life being more affected by temperature than rpm, but I could well be wrong.
tepidhalibut wrote:The other easy source of information is the Type Certificate Data Sheet, which includes the operating limits for the shafts. For the PW1100G, and gives the Maximum LP speed as 10,047rpm and maximum HP speed as 22,300rpm. It doesn't detail typical speeds at cruise, but I'd bet that they'd be around >90% of those speed limits.
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