Re: More Boeing Bad News
Posted: Mon Feb 22, 2021 8:35 am
For the uber nerds here...
https://prattwhitney.com/products-and-s ... pw4000-112
https://prattwhitney.com/products-and-s ... pw4000-112
PW4000-112 ENGINE
The 112-inch-fan PW4000 is an ultra-high-thrust model covering the 74,000 to 98,000-pound-thrust class to meet the requirements for the Boeing 777 –200/-200ER/-300twinjets. It was the launch engine for the 777, entering service in 1995.
The PW4084, with 84,000 pounds of thrust, was the first engine to enter service already approved for 180-minute ETOPS and has subsequently been approved for 207 minutes, the maximum allowable, along with all the other PW4000-112 inch models. A higherthrust model, the PW4090, with 90,000 pounds of thrust, powers an increased-grossweight version of the 777. And the 98,000-pound-thrust PW4098 currently powers the777 up to 660,000 lbs take-off weight.
The 112-inch PW4000 also is our largest commercial engine, its diameter nearly as wideas the fuselage of a Boeing 737. Using hollow titanium, shroudless fan blades, the PW4000 provides high efficiency and low noise along with superb resistance to foreign object damage.In addition to being the market-experience leader, the PW4000-112 on the 777 has thebest-in-class reliability statistics, attributable to its mature, derivative, high technologydesign and validation methodology.
Engine Characteristics
Fan tip diameter: 112 inches
Length, flange to flange: 191.7 inches
Takeoff thrust: 74,000 - 98,000 pounds of thrust
Flat rated temperature: 86 degrees F
Bypass ratio: 5.8-to-1 to 6.4-to-1
Overall pressure ratio: 34.2 - 42.8
Fan pressure ratio: 1.70 - 1.80