Pratt & Whitney’s Geared Turbofan™ Engine Revolutionizing Aviation 

He's on a factory floor, it's the safety requirement.

What they are really celebrating here is the fact that ANY CHANGE AT ALL GOT THROUGH ! ! !

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.

Homie needs to get 20 to life for his ‘skills’

I totally agree with that 💯

You're right about that! 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.

That wouldn't be bad on cars either. Alway running at the most efficient RPM would save a lot.

down the fucking drain.

You mean the RR Ultrafan ? They can do even better with a continuously variable gear ratio turbofan .

They aren't going to show it publicly. That would be giving away their secrets!

It's a planetary gear, not much new.

We know this a comminicae. You aren’t fooling anyone.

Bigger (longer) fan blade More bypass ratio, more air. If you go to your local department store at the fan section. Check small fan vs bigger fan speed and the amount of wind coming out. :)

Looks like GE built something similar and rolls royce are about to do the same thing so all airlines will have something like this soon

Not with this overweight piece of junk. 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.

why? you want your car to blow up too?

The fuel efficiency gained from geared turbofans won't make USA less dependent on foreign powers from fuel. The efficiency increase isn't large enough for that. I have no doubt in a decade or two, technological advances will make USA (and the rest of the planet) independent of fossil fuels, and the dictators like the Saudi family would have to find a new source of income (tourism?). But geared turbofans? No, this will just save some fuel and money.

Yep. Gears in high rpm and with a engine with a lot of heat. Might likely make this type of engine a high maintenance engine.

@@cool2180 lol, I overhaul them for a living…those gear systems are actually one of the most reliable things on the engine!

No, it is just more efficient to move more air relativly slow instead of moving less air with a high speed. And there is a limit which is the speed of sound. The tip of the fan blades must not move faster than the speed of sound, otherwise it would create extrem noise and very low efficieny. So in order to increase the fan size you need to reduce the fan speed. You can´t do this on conventional engines without loosing efficency in the inner turbine (hot section). Now with a gear, you can optimize both speeds. Simply use then blades with an higher angle of incidence to get the air move with the same speed.

Interesting... Always thought that Newton's 3rd Law meant the faster that air is pushed through the engine (i.e. action), the more thrust (reaction) is generated...

Except the fan isn't what produces the thrust if you look at the rotating engine diagram. It's the turbine that does. The fan is meant to divert as much air away from the core as it can to actually reduce noise and keep the core hot without melting, because the hotter it is, the more explosive the burn, and the more thrust per fuel unit burned. If you can slow down the fan but make it bigger, you get the same amount of air in the core but at far more noise-efficient and fuel-efficient performance.

Speed AND mass must both be considered.

That is incorrect.

walk up to one of them and stick your head inside

Pretty sure planes don't apply to the "loud pipes save lives" irresponsible motorcyclists tout. And for all you 2 wheel enthusiasts, I've been riding my whole life. When i ride, my safety is my responsibility. Not the others on the road.

It's still using parts that will wear at the initial high RPM. The devil lives in the details and P&W is still struggling with the technology. Other jet engine manufactures have either got cold feet in the initial design phases or have failed prototypes. If P&W licks this we can expect to see some engines sporting some truly massive fan nacelles in the 18 to 25 foot range that have more diameter than length.

who the fuck are 'The Sullivans?"

Several. For example, less moving parts, more extraction of work from the combusting gases, reducing fluid drag, getting around wave drag from sound, better compressors... not an exhaustive or detailed list, of course.

@@wowalamoiz9489 thanks for the insight!

@@Ausiedundan A lot of people tslk about how turbofans are more efficient because they move a large mass of air at lower speeds- but that makes no sense. A small mass moved at high speeds has the same momentum (mass*velocity) as a large mass of air at lower speeds. The real reason why turbojets are less efficient than turbofans or turboprops is because in a turbojet, most of the thrust must comes from the exhaust. So a minority is used to run the turbine and compressor. But the exhaust carries away a lot of energy as heat. In turbofans and turboprop, the turbines extract more power from the exhaust to run a fan or prop (as well as the compressor), hence reducing losses due to heat.

@@wowalamoiz9489 that’s a good point. Thanks for explaining :)

@@wowalamoiz9489 I would kindly like to say you’re incorrect. Google propulsive efficiency

Rolls has already done this

John Smith That was my point

The GTF improved BSFC by 15%. Rolls can't match that.

John Smith That's great. As long as it's dependable.

since 1970. RB211-22B

True...but irrelevant to this video? Before this they were getting nothing for something, and now they are getting something for something.

China (no hate, it's just they have the resources to copy this stuff)

@@wowalamoiz9489 They do

Yes but those are appearing more and more to be pilots pushing the engines beyond spec. They're used extensively by Bombardier, and they have close to 5 times as many planes in the air as Airbus' 320 and 330 NEO. And in their case, no issues.

what the fuck you talking about?

Fundamentally different (and combinable!) technology. Now, this PurePower engine is fairly low thrust, nowhere near what's needed for the 787s or A350s. PW hasn't shown any proof that these engines can be successfully scaled up.

Ge is trash