The next step would be pitch control for the turbofan. So many turbofans sound like a buzzsaw/garbage disposal. We have seen the results of all that noise and vibration with an emergency landing of an A380 in Canada( uncontained failure turbofan) and two southwest planes(turbofan failures), sadly one fatality, a well loved lady lost her life. The geared turbofan will greatly reduce the fatigue on the turbofans of today and tomorrow. Nice going guys!!!
These engines have been introduced in haste. Around 31 "A320 Neo" aircraft of Indian carrier "Indigo" have been grounded as the new engine packed off mid air. Passengers reported hearing huge bang and the engine just shut down.
Martian Tripod you should check your source of information, no these are not the NEO engines, this is a diff tech still in the testing phase, will be a while before its put to commercial use,
Imagine if it would also have carbon fiber blades, it would dominate the market hands down. Slow blades and the highest bypass ratio combined would totally change the game, now it's a compromise between CFM/GE and P&W.
The US Air Force needs to put these on the KC-135 Stratotanker. It would be a huge fuel saving program. It would be about 1600 engines too. Maybe reengine the B-52 with four of them too.
Hell, if they can just put modern turbofans on the B-52 they could cut the number of engines by half and get better performance in the deal! That plane uses the same engines as the 707, from the late 50's, without fan bypass!
the C135 tankers are nearly out of service and they were allready upgraded to CFM56 turbofans from the older JT engines .. doubt its worth it a second (or eve third for early models re-engining when they are due to be replaced soon (with the KC-46)
why oh why do the producers of most technical videos believe that viewers are blithering idiots who will become distracted or lose attention with out loud, nervous background sound tracks??? I am a highly developed humanoid who has taught myself to chew gum and walk at the same time. It is difficult but I am able to do it. Sometimes I do however, forget the left - right thing. Maybe I need a sound track to keep me focused?
but i don't get how this is more efficient, because now the fan spins slower than normal which means it will get less thrust, while the compressor spins at the same speed the fan is spinning slower than normal and in order to achieve the same amount of thrust as engine without gearbox the compressor now have to work harder which means it will eat up more fuel! so how is this gearbox more efficient? can anyone explain to me how is this more efficient?
A larger fan can push more air mass, thus, more thrust available. In place of pushing less air to a very high speed (noisy and not very friendly with the fuel), the fan increased its size, slowed its speed but increased the mass flow, therefore, at lower speeds (quieter, fuel friendly), you get the same power. For a plane going subsonic, a slow fan is more efficient.
Ok, you seem like you may know the answer to a question that has been bugging me for a few days now. It appears to me that that there must be some sort of gearbox between each jet engine stage already since, like in a GE90, they each turn at very different speeds. With this in mind, please explain why this final gear reduction has been so difficult to achieve. How are the intermediate stages coupled anyway, they each seem to turn at different speeds, they have counter rotating sections, reverse direction, etc., and yet they still transmit power from the rear turbine thru to very large powerful fans, now PW is saying that a gearbox on the final connection is a game changer, please explain. I see this comment is 2 years old, so I'm saying thanks in advance if you decide to answer me.
Darnley Bynoe Actually, there's no gearing between stages. The spools rotate independently from each other, at least on large engines like the Rolls Royce Trent (I think they have three spools), GE90 and PW4000. They have no mechanical linkage among them, what makes them move is the fluid that goes through them. Why was it so difficult to make a final reduction? Well, because of the size of the engine and the power that the gear has to handle, it has to be an extremely reliable gear, lives depend on the reliability of those components. Putting a gear simplifies the design of the engine stages. The high pressure compressor works more efficiently at high rpms and the fan is more efficient at subsonic speeds. Extracting power at low speeds from a very high speed fluid would require a lot of intermediate stages, with the associate cost of having more blades to maintain and replace.
Damley Bynoe... The main front power fan is driven by a planetary gear set... Not sure about the specific gear ratio, but it's a reduction gear. As for the compressor & turbine stages, they are split in high pressure & low pressure... high pressure on hollow shaft & low pressure on solid primary shaft running through the hollow shaft independently. Basically, the high pressure turbine spool primarily runs the high pressure compressor spool and is allowed to run at a different/higher RPM than the low pressure spool which is the primary drive for the front main fan via planetary reduction gear to keep the fan blade tips subsonic for efficiency & long cycle operation/reliability. I hope I explained this so even I can understand it...HA! :)
Next, have a Russian woman redo the voice over in English for that Russian accent affect and have her do the video in Russian as well. It would help the PW1000G seem so legit as the engine of choice in the new MS-21 single isle aircraft family.
All current turbofan engines already have complex gearboxes, when they seize, stuff shears, but it's not a catastrophic issue. The engine will just be shut down and the flight will be completed or diverted using the other engine(s) and/or emergency power systems. Based on their design, I think if it seizes, the turbofan will run at a higher speed, reducing efficiency, but still flyable.
Gears are meant to shear, the fan can continue to turn, but without PTO (Power takeoff) and no fuel. So it would just spin. With the geared design, it looks like it could seize too, but it would just end up either locking the fan to the turbine or just shearing and leaving it to free-spin. All of these things have already been looked at and tested. I've worked for a similar company, there's a lot of redundant systems and failure modes that have been thought of.
That's why it's taken so long and so much money to get to this stage - the lead engineer has devoted his entire career to this one technology - they reckon it's ready to run with 100% dependability.
SirSleepJunkie I agree with you. I have great respect for that engineer. Sometimes you do stuff, not because it's easy, but particularly because it is hard. People like that engineer are like the people who made it possible for us to go to the moon. I hope we can all aspire to be like that in some way.
Without knowing the full specs, I'm guessing it has a planetary gearbox and has limited thrust compared to the big guns: Rolls Royce Trent's and GE 90's. Power limitations and weight have the deciding factor to that gearbox design. Either way, I like the idea in principle.
Well, basically, its just a modern version of turbo prop engine, but with significantly less noise emission. Thanks to new technology its now possible to have such an efficient engine with (12:1 ) by pass ratio.
nice vid but you are not inventive at all, geared fan exists very long time, bae146 has small geared fan, all inventions come from uk, metal composite fan blade without mid span shroud.... you just copy others ideas and present as yours
Good to know innovation is still kicking in a decades-old technology!
Ok, fine, you have me convinced.
Where can I buy one, how much is it, and how do I attach it to my bicycle?
I need one for my '73 Super Beetle. Order online? Think 'bout $30mil/ ea. And just use the maintenance stand for it and a bicycle tag along bar.
@British Airways Boeing 747-436 Not with that attitude!
I need two, in case one fails.
@@MarzEzOnline
I think #2 was the test engine.
*engine starter kit and fuel systems not included in the box.
Music is too loud. Very distracting.
100% agree !!
The next step would be pitch control for the turbofan. So many turbofans sound like a buzzsaw/garbage disposal. We have seen the results of all that noise and vibration with an emergency landing of an A380 in Canada( uncontained failure turbofan) and two southwest planes(turbofan failures), sadly one fatality, a well loved lady lost her life. The geared turbofan will greatly reduce the fatigue on the turbofans of today and tomorrow. Nice going guys!!!
Very nice, the conventional engine in the comparison with more stages must be CFM LEAP-X, it indeed has a huge 7-stage turbine for example.
You can definitely understand the presenter speaking, but the music is way louder than it should be...
These engines have been introduced in haste. Around 31 "A320 Neo" aircraft of Indian carrier "Indigo" have been grounded as the new engine packed off mid air. Passengers reported hearing huge bang and the engine just shut down.
Martian Tripod you should check your source of information, no these are not the NEO engines, this is a diff tech still in the testing phase, will be a while before its put to commercial use,
@@dannydawn927 it is A320-271N with " Pratt & Whitney PW1127G-JM " engine.. all a320neo with Pratt & Whitney PW1000G facing same problem
@@dannydawn927 You’re just wrong.
A company named GoAir got Bankrupt buying this engine.
Great engines good job guys .
@paduajoseph Thanks man, as a mechanical engineering student, I ve been always fascianatied by this sort of stuff.
OUTSTANDING.
Do a gearbox design they said, it won't have too many teething troubles they said...
Now that's of planetary importance.
The background music is sooooo annoying.
On the last video, you can see some smoke from the pw1000g as well as the older jt9d engines.
Yay, The Engines for the embraer ERJ E2
Does the fan rotate in the opposite direction as LPCs?
Brilliant
The background "music" ruins the video. The presenters´voice is intelligible. Very amateurish!
Unducted fan variation of this engine when?
This gearbox is like the used in turboprops???
Imagine if it would also have carbon fiber blades, it would dominate the market hands down.
Slow blades and the highest bypass ratio combined would totally change the game, now it's a compromise between CFM/GE and P&W.
When will they decide to put constant speed propler technology into a fan?
The over enthusiastic student pilot who tried to throw in whatever he learned in ground school that day 😂😂😂
Why is the air slower when the fan is bigger?
It could be the new engine for the reengined E-Jets. :-)
This technology may pave the way for a really short stubby jet engine with a whopping 20 feet in diameter. Engineering wise it's a long shot.
Sounds great! Where do I buy one?
PM me!
The US Air Force needs to put these on the KC-135 Stratotanker. It would be a huge fuel saving program. It would be about 1600 engines too. Maybe reengine the B-52 with four of them too.
Hell, if they can just put modern turbofans on the B-52 they could cut the number of engines by half and get better performance in the deal! That plane uses the same engines as the 707, from the late 50's, without fan bypass!
the C135 tankers are nearly out of service and they were allready upgraded to CFM56 turbofans from the older JT engines .. doubt its worth it a second (or eve third for early models re-engining when they are due to be replaced soon (with the KC-46)
There is a version that went for the B-52 but was won by Rolls-Royce. The version P&W put up is going in the new B-21.
The ultimate competitor for the CFMI LEAP. Who do you think is the better one?
(Also considering aesthetics (of the fan blades).)
Can you do the PW2000
👍👍👍
What about the distinct whale noise?
why oh why do the producers of most technical videos believe that viewers are blithering idiots who will become distracted or lose attention with out loud, nervous background sound tracks??? I am a highly developed humanoid who has taught myself to chew gum and walk at the same time. It is difficult but I am able to do it. Sometimes I do however, forget the left - right thing. Maybe I need a sound track to keep me focused?
Why didnt i think of that
IS THE IDEA OF A GEARED JET ENGINE NEW ?
I THOUGHT IT ALREADY EXISTS
Nice... Beautiful..
What's the gear ratio of the transmission?
3:1
but i don't get how this is more efficient, because now the fan spins slower than normal which means it will get less thrust, while the compressor spins at the same speed the fan is spinning slower than normal and in order to achieve the same amount of thrust as engine without gearbox the compressor now have to work harder which means it will eat up more fuel! so how is this gearbox more efficient? can anyone explain to me how is this more efficient?
A larger fan can push more air mass, thus, more thrust available. In place of pushing less air to a very high speed (noisy and not very friendly with the fuel), the fan increased its size, slowed its speed but increased the mass flow, therefore, at lower speeds (quieter, fuel friendly), you get the same power. For a plane going subsonic, a slow fan is more efficient.
smlbstcbr Ah! I see! thanks!
Ok, you seem like you may know the answer to a question that has been bugging me for a few days now. It appears to me that that there must be some sort of gearbox between each jet engine stage already since, like in a GE90, they each turn at very different speeds. With this in mind, please explain why this final gear reduction has been so difficult to achieve. How are the intermediate stages coupled anyway, they each seem to turn at different speeds, they have counter rotating sections, reverse direction, etc., and yet they still transmit power from the rear turbine thru to very large powerful fans, now PW is saying that a gearbox on the final connection is a game changer, please explain. I see this comment is 2 years old, so I'm saying thanks in advance if you decide to answer me.
Darnley Bynoe Actually, there's no gearing between stages. The spools rotate independently from each other, at least on large engines like the Rolls Royce Trent (I think they have three spools), GE90 and PW4000. They have no mechanical linkage among them, what makes them move is the fluid that goes through them. Why was it so difficult to make a final reduction? Well, because of the size of the engine and the power that the gear has to handle, it has to be an extremely reliable gear, lives depend on the reliability of those components. Putting a gear simplifies the design of the engine stages. The high pressure compressor works more efficiently at high rpms and the fan is more efficient at subsonic speeds. Extracting power at low speeds from a very high speed fluid would require a lot of intermediate stages, with the associate cost of having more blades to maintain and replace.
Damley Bynoe... The main front power fan is driven by a planetary gear set... Not sure about the specific gear ratio, but it's a reduction gear.
As for the compressor & turbine stages, they are split in high pressure & low pressure... high pressure on hollow shaft & low pressure on solid primary shaft running through the hollow shaft independently. Basically, the high pressure turbine spool primarily runs the high pressure compressor spool and is allowed to run at a different/higher RPM than the low pressure spool which is the primary drive for the front main fan via planetary reduction gear to keep the fan blade tips subsonic for efficiency & long cycle operation/reliability.
I hope I explained this so even I can understand it...HA! :)
Thrust range not nearly high enough (30k vs 60k), and Boeing made the GEnx engine exclusive to the 747-8.
Still waiting fo an FT1000
Less parts, simpler, but the gearbox is problematic... So far A320neo with PW had issues, GE engines not.
CFM: laughs in reliability
CFM are great engines
the world's largest a320neo operator indigo doesnt find pw1000g very "dependable" but okay
NOOOOOOOOOOOO,,WHY LESS NOISE :(,,I LIKED IT SO FAR
Less fan speed of course
Next, have a Russian woman redo the voice over in English for that Russian accent affect and have her do the video in Russian as well. It would help the PW1000G seem so legit as the engine of choice in the new MS-21 single isle aircraft family.
Its great until the gearbox packs up!
All current turbofan engines already have complex gearboxes, when they seize, stuff shears, but it's not a catastrophic issue. The engine will just be shut down and the flight will be completed or diverted using the other engine(s) and/or emergency power systems.
Based on their design, I think if it seizes, the turbofan will run at a higher speed, reducing efficiency, but still flyable.
If the fan seizes it's not going to move is it? The gearboxes on aircraft don't have 80000lb of thrust going through them do they??!!
Gears are meant to shear, the fan can continue to turn, but without PTO (Power takeoff) and no fuel. So it would just spin.
With the geared design, it looks like it could seize too, but it would just end up either locking the fan to the turbine or just shearing and leaving it to free-spin.
All of these things have already been looked at and tested. I've worked for a similar company, there's a lot of redundant systems and failure modes that have been thought of.
That's why it's taken so long and so much money to get to this stage - the lead engineer has devoted his entire career to this one technology - they reckon it's ready to run with 100% dependability.
SirSleepJunkie I agree with you. I have great respect for that engineer.
Sometimes you do stuff, not because it's easy, but particularly because it is hard. People like that engineer are like the people who made it possible for us to go to the moon. I hope we can all aspire to be like that in some way.
Music isn't loud enough.
Defective engines
India has grounded them
Music is way to loud.
Too bad the music overpowers the talking
TFE731 came way before this, lol
ระบบส่งกำลังเครื่งยนต์.พลังงานกล.ระบบ.จาค.ระบบส่งกำลัง.เครื่งยนต์.เทโบว์แฟน.เครื่งยนต์ใบพัด..
2/2.:ออโต้..ออตโต้.
Music too loud.
no planetary gears
Without knowing the full specs, I'm guessing it has a planetary gearbox and has limited thrust compared to the big guns: Rolls Royce Trent's and GE 90's. Power limitations and weight have the deciding factor to that gearbox design. Either way, I like the idea in principle.
What the music has to do with it, it’s disturbing
Good video minus the music
เครื่องหมายคำพูด.ร.พววมาบัย..ข้อห้าม.
Forget the bicycle.
สวืช.
Well, basically, its just a modern version of turbo prop engine, but with significantly less noise emission. Thanks to new technology its now possible to have such an efficient engine with (12:1 ) by pass ratio.
รุ่น..สิ่อส่ร.คำพผุ.พวงมาลัย.
Leap power ¡¡¡
กลศาตร์.เครื่องยนต์.สันดาบ.พลังงานไฟฟ้า.1.พลังงาน.กล..2.พลังงานจนล์.วิศวกรรมไฟฟ้า.กลศาตร์.พลังงานปฐมภูมิ.รึทุติยภูมิ.หมวดกลศาตร์วิศวกรรมไฟฟ้า.พงังงาน.สะอาด.รึ.เครื่องบนต์สันดาบพลังงานไฟฟ้า.สนามแม่เหล็ก.ทุติสภูมิ.ปซมภูมิ.พลังงาน.ไฟฟ้า..
Pls no need music
Pity it's proven to be very problematic in service
So, I guess Boeing should consider these engines for the 747-8. I would.
Delete the gearbox and spin the main large fan with an electric motor! Hybrid Electric Jet Engine!
You the stupidest human on the planet?
Bad video. The music is too loud
this information is not enough . so we will need to read a lot of books. because there are everything about electrical engineering.
so many problems... i prefer cfm leap
ดร
สันเดสบ
สมูชท์...ไอดี.สีนเาบ.ปรับอาดาศ.25.:องค์ศา..ต่ามสตนาฐาน
สำนักงาน.ย้าน.ตีก.อาคารกร้าง.
Heeeheeeheeee.....only to prove to be problematic in few years 🥴🥴🤪😜😂😂😂
GEnx is better XP
nice vid but you are not inventive at all, geared fan exists very long time, bae146 has small geared fan, all inventions come from uk, metal composite fan blade without mid span shroud.... you just copy others ideas and present as yours
PW1000G "how it works" goes KA-BOOM ! Why don't they talk about that? (Mirabel Canada)