Here's a question for anyone with C90 experience, specifically older models with the -20 (not -21) engines.
The book says max power for takeoff, 5 minute limit is 1315 ft lbs. and an ITT of 750, then cruise climb to ITT 725. It's been suggested that to "baby" the engines, you would set t/o power less than max. Sorry, I don't know the exact settings used.
I've only had experience with -21 engines, we always used max allowable power limits for takeoff, usually temp limited, but sometimes torque limits on colder days.
I don't like the idea of less than full power for t/o, just for the sake of a few extra hours before overhaul, and that won't count if you run off the end of the runway, (we're talking Rocky Mts. here) and the whole thing sounds like one of those old-wives-tales, but maybe that's how the -20's need to be operated, I just don't know. Anybody know the real story? Thanks for any info.
The book says max power for takeoff, 5 minute limit is 1315 ft lbs. and an ITT of 750, then cruise climb to ITT 725. It's been suggested that to "baby" the engines, you would set t/o power less than max. Sorry, I don't know the exact settings used.
I've only had experience with -21 engines, we always used max allowable power limits for takeoff, usually temp limited, but sometimes torque limits on colder days.
I don't like the idea of less than full power for t/o, just for the sake of a few extra hours before overhaul, and that won't count if you run off the end of the runway, (we're talking Rocky Mts. here) and the whole thing sounds like one of those old-wives-tales, but maybe that's how the -20's need to be operated, I just don't know. Anybody know the real story? Thanks for any info.