I piloted the little Bae146 for ten years. It had the AFL502 engine which had a geared fan over 20 years ago! It wasn't a perfect engine but the gearbox never failed AND it was very quiet!
Just WAIT. No one, and PW didn't TELL the FAA, knows WHY the GTF gearbox is 80% loaded on only TWO of the planetary gears. Just WAIT. FAA Certification, engines, planes, pilots, people; LIP SERVICE.
Better continue to hope it don't BLOW UP like the oil seal problem in its PW1500G, or the high compressor knife-edge HCF in the PW1100G, or the one-pipe-out cooling of the high turbine. Just wait a bit longer for the NEXT failure. When "gender parity" takes precedent over ENGINEERING then you're DOOMED, just wait. What HORSESHIT. They don't KNOW how to manage a successful engine program = a happy customer. PW only fixes ANYTHING that negatively impacts their financials as they kick the can down the road of rotating managers in and out of programs while the responsibility chases them through their "career." FAA Certification, engines, planes, pilots, people; ALL given nothing but LIP SERVICE. Talk to Airbus or GoFirst about how happy they are over the GTF.
just got one question about the bearings in the gearbox? from what I see you have used flat bearings rather than tapered ones? won't that predispose the bearings to premature wear and tear?...noisy gearboxes? due to gyroscopic forces on individual gears being bounced up and down on a wing..plus torque twisting of the big fan on the central shaft via of course the gearbox
you nailed it. On the 220 at my company we have done multiple unscheduled engine changes due to bearing flakes found in the scavenge screen of the reduction gearbox
Old PW tech with radial engine WW2 era engine gearbox. PW is WAY ahead of it's time. Just wait until the gears blow and saw an A/C in half. I guess the PW4000 wasn't bad enough. And no doubt, like the 4000, all financed by the USA.
The fan is driven from the turbine. It's on the same shaft as the turbine exhaust blades (rear of the whole engine) however it's geared down through a planetary gearbox. (Same sort of gearbox that's in compact drills). For a better understanding of the concepts behind turbines (first stage,second stage compression, combustion/ignition stage and turbine stage) look up how a turbojet works, then look up how a turbofan/turboprop works
If it's not reliable, nobody will fly it. Simple as that. People seem to value their life very much (in the short term). Hopefully they get it fixed. Rolls-Royce UltraFan is geared as well and is coming to market. I'm sure GE will manufacture a geared ultra high bypass turbofan as well.
But it's not the architecture causing the problem. PW is spinning their small 3-stage turbine so quickly that their standard Titanium can't withstand it. GE and Rolls Royce both went with Ceramic Matrix Composites for a reason.
That has nothing to do with the architecture though if you actually read up on the issues. It's not the gearbox or shafts having problems. PW needs to invest in ceramic matrix composites just as GE did, or their tiny, ultrafast cores will, yes, suffer catastrophic failure.
Too bad a factory employee Daniel Marselli is a thief and steels regular, he even stole all of the 1982 Cromwell highschool class rings and threw them all into the Connecticut river, happy flying on a deranged engineer designed plane, better you than me! This is fact!
If you hire me as an engineer in your company I want to develop an engine that can't be refueled in 20yrs or an engine that can fly 1500hrs of not refuelling nonstop
It is time for aerospace industry to shift towards alternative propulsion system which is beyond GTF or any fossil fuel burning systems. The automotive industry is leading this area of innovation although historically they have adapted innovations from the aerospace industry. All electric, fuel-cell and hybrid propulsion systems are the system of tomorrow which should be worked on today.
It's great innovation but it will prolong the inevitable fact that the day will come when there is not enough oil to power jet engines this will affect the airline industry greatly so new revolutionary propulsion system is needed if it wants to survive
