You probably dont give a shit but does someone know of a method to log back into an Instagram account..? I stupidly forgot the password. I love any tips you can give me.
@@acbulgin2 The more I look at turbine blades the more sense they make of velocity, fluid dynamics, power transfer etc. They seem ‘truth-telling’ somehow 🤔
That level of precision engineering is so satisfying. From the ceramic coated blades to the sound of instalment matched with perfect balancing it’s just pure bliss to the mechanically inclined individual.
I worked machining these exact parts for g.e. pratt and whitney etc,the man hours to produce these things was huge,the tolerances on fit was at times less than .005 of a thousand.of an inch. Precision machining is no joke at this level.
There is a single stage turbine, which extracts sufficient energy from the combustion gas stream to provide the torque required to turn the 12 stage compressor. Turbine blades have a very different aerodynamic function than compressor blades, and their appearance illustrates this difference.
What I meant by a partial career is at the moment I have no idea what I'd really like to do in the future. And if it takes more than two tries at finding my goal career, I'll do it. From the beginning I wanted to be an aerospace engineer, Now I want to be an airline pilot. Yet every time I see a turbine engine up close, they just fascinate me. Thanks to your videos that I've watched for a good 2-3 years now I really do understand how they operate. I'd still love to visit FSJ.
Awww, cute little blades. I assembled and serviced industrial turbo pumps for many years, some of the first stage blades were almost a meter long. the biggest was for a gas liquefaction plant on the Sakhalin Islands. It has an axial compressor feeding a radial compressor. The rotor of the axial compressor naked was just on 18 metric tons. Interesting is how the weight scatter on the blades is close to what these little ones are. I love the simple but efficient principles of turbines and how they sound. Thx for the uploads.
watching such amazing video makes everything clear regarding imagine the flow of gas through stator's and rotor's blades,which is much better than reading ,thank you so much for really precipus video that let me imaging the gas flow through blades,and imagine changes of velocity and pressure of gas through rotor and stator blades
I have made those type of blades before. I worked in a machine shop that used electro chemical machining. It lets the finish and an shape form easy without stressing the metal
Dear, AgentJayZ and MrPocketWatch. You guys are so close in your conversation when it comes to the next generation of tubine engines. I'll say no more because the patent is still in the works, and I don't have a Pending Patent, but you'll be pleasantly suprised at the simplitcity and also the complexity of things to come.
@MrPocketWatch1 What may look like a turbine that turns the opposite direction is actually the turbine inlet nozzle. It's fixed to the engine cases, and directs combustion gases at the best angle to efficiently drive the single stage of turbine blades in this engine. There are no engines that use a turbine spinning the opposite direction as a nozzle for a subsequent turbine.
I find this video incredibly relaxing when the blades are being installed, that must be one of the most satisfying jobs when resurrecting a jet engine. Love the vids, keep it up!
The best I can figure is that there is something amazing about the symphony of mechanical components working together that makes this so appealing... Of which, mostly men understand.
@@AgentJayZ You're right.... I guess I gotta throw my two cents in because men never hear the end how we are holding women back. Great Video's ... glad you take to the time...
Bee. Ee. Ay. You-tiful. Perfection. Each one a miniature aerofoil, an aircraft wing all its own. Actually, given its function, ‘glider wing’ might be more appropriate because *like* a glider wing, the turbine is reliant entirely upon the accelerated airflow incident upon it for lift; or in this case, rotation. Thanks JayZ for all the years of awesome content. And greater thanks for fielding and even *attempting* to answer *some* of the hundreds of questions sent your way. Actually, I’ll rephrase that, to be more accurate: translating so many inquiries into questions that are answerable………and answering them. Thank you.
In my childhood I got a fan blade from a pilot from the legendary aerobatic team Frecce Tricolori during an airshow, because I was sitting in the cockpit of his aircraft and told him all about it and how it is functioning and how to fly this aircraft! He was simply so astonished and fascinated from my knowledge about it and I told him that I am addicted to aircraft's and I am very excited to be in this cockpit and I am twelve years old! He said I should go with him to his car and as we went on his car he opened a suitcase and picked the fan blade out and gave it to me and he said it is a gift for me because I am so interested and well educated in flying and on the attachment point to the engine was a little hole in it with a ring inside and since this day I carry this little fan blade on a dogs collar on my neck and I eat sometimes my ice-cream or yogurt with it! The pilot told me that this little thing was once inside the engine of one of his aircraft's right behind the hottest part of the engine and it was from a Pratt&Whittney engine! I love it so very much and I am so proud to have it! 😍😍😍😍😍Lovely greetings from Sarah 🙋💖😍✈️👍
From the blade weights that I was able to catch in the video, the blades vary in weight by as much as 12 grams from each other....approximately a third of an ounce. I'm guessing that such difference isn't critical to the integrity of each blade under load, but explains why the need to balance the entire turbine disc. But what variable in the manufacturing or coating process would account for as much as a 3-4% differing finished weight of the blades? In a field driven by high precision, I'm surprised at such variability.
Now that is a question I don't really know the answer to. I would not be surprised if their was that much variability engineered into the production technique. But I don't know.
I would have to guess the 3-4% variability would come from the composition of the materials, depending on manufacturing techniques. the blades generally a made from a single ingot of metal, titanium and/or nickle tin alloys, these you say have a ceramic coating, which could also effect the weight, but specific impurities and imperfections on the alloy compositions could also explain the variance. It is most likely a combination of all three.
It's mostly to do with dimensional variation on the casting of the blades (not sure if these are cast, but similar story for wrought blades too). The alloy composition tends to be very strictly controlled, as does the mass of coatings. For a lost wax casting process you've got variation in wax pattern size, ceramic core size (though these look like solid blades) and ceramic shell size, all of which contribute to a varying size for the final casting. As Jangle points out, the difference does not affect the blade integrity :)
When this engine was produced, the turbine blades were uncoated. We have applied a modern process to improve the heat tolerance of the blades. I believe a J47 back in the day went for about 55,000.00US
Love new old stock!!. I bought a nos mechanical wind up german alarm clock made in 1977,, i wanted back up in case my mobile died on me,,couldnt resist buying clock made when i was in first year of junior school!!
So well balanced that adding the miniscule weight of a single blade causes the entire assembly to rotate. Very cool stuff, makes me want to build a functional miniature gas turbine engine.
@crazyrum It's a roll pin; it's a spring that is slightly larger than the hole you drive it into... and yes centrifugal force tends to push it into the hole.
..once as a thesis, developed a computer program in NPS, Monterey, blade sequence for minimum imbalance, since they weigh slightly different than each other, (i.e.,166blades, 166! factorial different way to place them), yet program used a heuristic way, also this video was very nicely put together....
The blades and turbine were balanced as an assembly before they were then numbered for position, taken apart... then the turbine was intalled in the engine, then the engine was turned horizontal, then the turbine blades were reinstalled as you see here.
The J47 is a first generation axial flow turbojet. Low compression, low temps, low power... compared to todays engines. Air-cooled nozzles and turbine blades were developed along with higher compression more than a decade after this engine was designed.
It slows the heat transfer into the blade from the hot gases, but does not affect the heat transfer out of the blade into the disc, and out of the disc into the cooling air it is supplied with. By how much? ...don't know. At the same fired temperature, it greatly prolongs blade and disc life. At the same projected service life, you can increase fired temp by 50F or so, giving increased power output.
Imagine forgetting to install just 1 pin lock for the blades, just 1 is enough to destroy the engine!, this is some super delicate stuff that I do not ever wanna mess with.
The ceramic coating to the turbine blades of this J47 is an example of "hot rodding". We have taken a modern thermal barrier coating, and have applied it to increase the performance of this old engine. It was never a service bulletin because the technology was developed after the manufacturer stopped supporting the engine. As far as I know, this is the only J47 ever given this upgrade in thermal protection.
As a Quality Engineer who takes pride in providing quality product to my customers, it bothers me that when we manufacture these blades with the ceramic coating, we have to wear clean white cotton gloves and absolutely no part to part contact.. The specs alone on handling of these parts is crazy, and just to watch you slap 2 parts together and manhandle them with your bare hands is very unnerving.
Making those blades is a Herculean task. GE perfected it.. They denied us the core engine tech. Never mind! We still admire their hardwork, skill, and finesse.
Hello fella , I just would like to say tnks about your videos , Im are AMT instructor and inside of class room the students are just fascinated . My best regards from São Paulo Brasil. Alex
I suppose... most sources call the turbine mounts firtee because they look like fir trees. The mounts on most compressor blades are called dovetail because, like the carpentry joint, they look like doves' tails. Calling a turbine blade a bucket, and calling the mount a dovetail is a bit like calling the rear gate on a pickup a hatchback... not totally wrong, but just different enough to raise a questioning eyebrow.
Actually, these were called buckets back then, as they were designed by steam turbine engineers. s3.amazonaws.com/dsg.files.app.content.prod/gereports/wp-content/uploads/2015/08/11203510/tumblr_inline_nsxs3jaQ031qzgziy_540.jpg
I'm surprised the weight varies so much blade to blade. I wouldn't expect more than a gram or two difference in high precision, identical and relatively small parts but there is more than 10g between some of them.
The high nickel alloy is quite heavy, and each blade is cast with a single use mould. There is no area on the blade where material van be removed to adjust the weight.
@@AgentJayZ Can't you drill a little 1mm diameter hole into the face that's facing you when you insert the blades at 2:44? (I mean hypothetically. I know you can't ignore the repair manual IRL)
В 46. Году. Слесарь ..КОВАЛЕВИЧ за 4 месяца. Вручную сделал. 52. Лопатки на турбину. Разница в весе составила. Миллиграмы. Ну о размерах и говорить нечего....
It's very hard that TBC I spent many hours polishing them with diamond pads, what a few of you watching may not know is each one of those buckets (blades ) is weighed and that data is fed it a computer that works out where on the wheel they go in relation to each other for perfect balance hence the numbers
There is no power turbine in a turbojet like the J47. And the J47 uses a single stage turbine, so this is the first, last, and only stage... The alloys have not changed a whole lot, but engines are firing hotter because of advancements in blade-cooling technology. Beyond the scope of my little channel, really.
I think the coating here is on a stage of the compressor section and that the coating is to prevent erosion on the blade surfaces that wears them down to where they will not function. You know like when you have someone sandblast your teeth to a fine point. I hate when that happens.
2:40 process of mental joy and satisfaction begins 😁😁 would see whole disk without skipping👍 Jay, thank you for sharing this all with us! ..and where I was before?😂
@1metiz New? 2500.00 but you can't get these anymore. To obtain one as a souvenir... their value is not measured in money, but in resoucefulness, courage, and a willingness to thrash back the boundaries of the great unknown. An aviation scrap yard would sell them for the price of their mostly nickel content.
Ceramics have been able to withstand combustion temperatures of jet fuel since before humans wondered what that black stuff was that stuck to their feet while they were looking at the animals trapped in the pit full of it.
"they" don't. We make 'em. And they are not that exotic. They are now original blades, with a ceramic thermal barrier coating applied, the same as all modern engines use.
I love how terminology differs in the same industry from company to company. We call them dovetail slots, but I tend to agree with you Jay, they look like fir trees.
Dovetails look like dove tails, and they are used on some compressor blades. Firtrees look like Fir trees, and are almost always used on turbine blades, because they are a stronger joint. I am surprised you don't know that they are two different things.
These are withouten Coolsingel whiteboards Some of them ABB use for the first stage And Second stage blades with cooling And the Thierry stage also does not use Cooling holes
wow, I wonder how they made the coating back in 1953... for sure they used the latest technology for these military engines now matter how much it cost
Without internal cooling I don’t see why bother with getting YSZ on them other than to prevent oxidation if that’s a concern but then you could just get them bond coated and do just fine. Not sure what aftermarket cost difference looks like but with such thin blades the top 3/4 won’t even know the bottom is being cooled by contact with the ring/hub Also the variance is somewhat on purpose to deal with harmonics. You don’t want every single blade to enter their intrinsic frequencies at once that would end .... poorly. Edit : stop calling them ceramic blades , that’s a whole other thing being worked on with cmcs
@@AgentJayZ I have proper modern blades sitting on my desk and a basic book on transport phenomena but never try to argue with “experience” on 70 YO tech I guess. My literally job is thermal testing these coatings and matls. I get you’re a tech working on these all day and read plenty of literature but I sit and stare at thermal models for how to cool these things what sort of heat transfer they have etc. Nickel has incredibly bad heat transfer. The YSZ does reflect some IR and provides oxidation protection but if you’re not pumping air up the core last half of the blade barely knows the disc is there holding it from a heat transfer perspective so this blade isn’t “cooled” unless I sorely missed some sort of passages on them. Reflecting IR doesn’t provide cooling. It only reduces heat transfer.
you have such a cool job dude would love a job like that but why don't you put a carpet on the floor could only help if u drop one or are you really that crazy good at ur job. love the video learned a lot
Are you referring to the forward stub shaft or the distance piece? Perhaps you're referring to bucket wheels which have radial slots for bucket cooling air.
Turbine blades are things of beauty, I got a Harrier Pegasus engine turbine blade, it has pride of place on my mantelpiece.
Agreed. It is as if they are 'designed by nature'
You probably dont give a shit but does someone know of a method to log back into an Instagram account..?
I stupidly forgot the password. I love any tips you can give me.
@Jesse Steven instablaster ;)
@@acbulgin2 The more I look at turbine blades the more sense they make of velocity, fluid dynamics, power transfer etc. They seem ‘truth-telling’ somehow 🤔
@@acbulgin2 Wonderful observations. Your post is also crafted beautifully. Made my day, though it is night here.
its kind of hypnotic how perfect blades fit
Watching the blades get inserted was so satisfying.
Thanks for sparing me the comment. :)
Yeah, but no, really. What is that?
I came down to write the same thing.
That level of precision engineering is so satisfying. From the ceramic coated blades to the sound of instalment matched with perfect balancing it’s just pure bliss to the mechanically inclined individual.
Bearings so smooth that the weight of a blade being added to one side makes it turn a bit.
Jack Bruce yup I was amazed by that
perpetual motion
Lol
I wonder what kind of bearings those are
Amazingly smooth
I worked machining these exact parts for g.e. pratt and whitney etc,the man hours to produce these things was huge,the tolerances on fit was at times less than .005 of a thousand.of an inch. Precision machining is no joke at this level.
This is truly the most fascinating video on the web.
There is a single stage turbine, which extracts sufficient energy from the combustion gas stream to provide the torque required to turn the 12 stage compressor.
Turbine blades have a very different aerodynamic function than compressor blades, and their appearance illustrates this difference.
What I meant by a partial career is at the moment I have no idea what I'd really like to do in the future. And if it takes more than two tries at finding my goal career, I'll do it. From the beginning I wanted to be an aerospace engineer, Now I want to be an airline pilot. Yet every time I see a turbine engine up close, they just fascinate me. Thanks to your videos that I've watched for a good 2-3 years now I really do understand how they operate. I'd still love to visit FSJ.
Awww, cute little blades. I assembled and serviced industrial turbo pumps for many years, some of the first stage blades were almost a meter long. the biggest was for a gas liquefaction plant on the Sakhalin Islands. It has an axial compressor feeding a radial compressor. The rotor of the axial compressor naked was just on 18 metric tons. Interesting is how the weight scatter on the blades is close to what these little ones are.
I love the simple but efficient principles of turbines and how they sound.
Thx for the uploads.
watching such amazing video makes everything clear regarding imagine the flow of gas through stator's and rotor's blades,which is much better than reading ,thank you so much for really precipus video that let me imaging the gas flow through blades,and imagine changes of velocity and pressure of gas through rotor and stator blades
Cool to think they were stored since a year before my father was born.. thanks for the video👍
sliding the blades back in looks like such a satisfying thing!!
@rickey5353 Blades made in 1953 out of high nickel refractory alloy. Coated with ceramic Thermal Barrier Coating by Avanti Aerospace in 2011.
They were made from some variant of Inconel?
@@nicholasmaude6906 yes. There are a bunch of names for nickel based super-alloys.
I have made those type of blades before. I worked in a machine shop that used electro chemical machining. It lets the finish and an shape form easy without stressing the metal
This channel rules! This is what I really want to see, not just compilations of the same recycled videos.
Dear, AgentJayZ and MrPocketWatch. You guys are so close in your conversation when it comes to the next generation of tubine engines. I'll say no more because the patent is still in the works, and I don't have a Pending Patent, but you'll be pleasantly suprised at the simplitcity and also the complexity of things to come.
@MrPocketWatch1 What may look like a turbine that turns the opposite direction is actually the turbine inlet nozzle. It's fixed to the engine cases, and directs combustion gases at the best angle to efficiently drive the single stage of turbine blades in this engine.
There are no engines that use a turbine spinning the opposite direction as a nozzle for a subsequent turbine.
I find this video incredibly relaxing when the blades are being installed, that must be one of the most satisfying jobs when resurrecting a jet engine. Love the vids, keep it up!
The best I can figure is that there is something amazing about the symphony of mechanical components working together that makes this so appealing... Of which, mostly men understand.
Oh, we have some pretty awesome gearhead girls on the team.
@@AgentJayZ You're right.... I guess I gotta throw my two cents in because men never hear the end how we are holding women back. Great Video's ... glad you take to the time...
Bee. Ee. Ay. You-tiful. Perfection. Each one a miniature aerofoil, an aircraft wing all its own. Actually, given its function, ‘glider wing’ might be more appropriate because *like* a glider wing, the turbine is reliant entirely upon the accelerated airflow incident upon it for lift; or in this case, rotation.
Thanks JayZ for all the years of awesome content. And greater thanks for fielding and even *attempting* to answer *some* of the hundreds of questions sent your way. Actually, I’ll rephrase that, to be more accurate: translating so many inquiries into questions that are answerable………and answering them. Thank you.
In my childhood I got a fan blade from a pilot from the legendary aerobatic team Frecce Tricolori during an airshow, because I was sitting in the cockpit of his aircraft and told him all about it and how it is functioning and how to fly this aircraft! He was simply so astonished and fascinated from my knowledge about it and I told him that I am addicted to aircraft's and I am very excited to be in this cockpit and I am twelve years old! He said I should go with him to his car and as we went on his car he opened a suitcase and picked the fan blade out and gave it to me and he said it is a gift for me because I am so interested and well educated in flying and on the attachment point to the engine was a little hole in it with a ring inside and since this day I carry this little fan blade on a dogs collar on my neck and I eat sometimes my ice-cream or yogurt with it! The pilot told me that this little thing was once inside the engine of one of his aircraft's right behind the hottest part of the engine and it was from a Pratt&Whittney engine! I love it so very much and I am so proud to have it! 😍😍😍😍😍Lovely greetings from Sarah 🙋💖😍✈️👍
I love how informational this is!
I don’t know why I feel comfortable and relaxed watching this😊
It's a thing of beauty to see a well made machine.
From the blade weights that I was able to catch in the video, the blades vary in weight by as much as 12 grams from each other....approximately a third of an ounce. I'm guessing that such difference isn't critical to the integrity of each blade under load, but explains why the need to balance the entire turbine disc. But what variable in the manufacturing or coating process would account for as much as a 3-4% differing finished weight of the blades?
In a field driven by high precision, I'm surprised at such variability.
Now that is a question I don't really know the answer to. I would not be surprised if their was that much variability engineered into the production technique.
But I don't know.
AgentJayZ Thanks. I couldn't even begin to guess. I'd be very interested in hearing the thoughts from others. Grahamj9101?
I would have to guess the 3-4% variability would come from the composition of the materials, depending on manufacturing techniques. the blades generally a made from a single ingot of metal, titanium and/or nickle tin alloys, these you say have a ceramic coating, which could also effect the weight, but specific impurities and imperfections on the alloy compositions could also explain the variance. It is most likely a combination of all three.
It's mostly to do with dimensional variation on the casting of the blades (not sure if these are cast, but similar story for wrought blades too).
The alloy composition tends to be very strictly controlled, as does the mass of coatings.
For a lost wax casting process you've got variation in wax pattern size, ceramic core size (though these look like solid blades) and ceramic shell size, all of which contribute to a varying size for the final casting.
As Jangle points out, the difference does not affect the blade integrity :)
I wonder why they wouldnt just have a spot for balancing on the base or something then. Or if it's the blade itself's weight that's more critical?
That was one of the best videos I ever saw explaining how this thing really works! Thanks!
When this engine was produced, the turbine blades were uncoated. We have applied a modern process to improve the heat tolerance of the blades.
I believe a J47 back in the day went for about 55,000.00US
It looks like thermal barrier coating based on zirconia
Love new old stock!!. I bought a nos mechanical wind up german alarm clock made in 1977,, i wanted back up in case my mobile died on me,,couldnt resist buying clock made when i was in first year of junior school!!
So well balanced that adding the miniscule weight of a single blade causes the entire assembly to rotate. Very cool stuff, makes me want to build a functional miniature gas turbine engine.
@crazyrum It's a roll pin; it's a spring that is slightly larger than the hole you drive it into... and yes centrifugal force tends to push it into the hole.
..once as a thesis, developed a computer program in NPS, Monterey, blade sequence for minimum imbalance, since they weigh slightly different than each other, (i.e.,166blades, 166! factorial different way to place them), yet program used a heuristic way, also this video was very nicely put together....
Excellent soundtrack for the assembly video
The blades and turbine were balanced as an assembly before they were then numbered for position, taken apart... then the turbine was intalled in the engine, then the engine was turned horizontal, then the turbine blades were reinstalled as you see here.
Beautiful. I’m dreaming about that job 😍
The J47 is a first generation axial flow turbojet. Low compression, low temps, low power... compared to todays engines. Air-cooled nozzles and turbine blades were developed along with higher compression more than a decade after this engine was designed.
It slows the heat transfer into the blade from the hot gases, but does not affect the heat transfer out of the blade into the disc, and out of the disc into the cooling air it is supplied with.
By how much? ...don't know.
At the same fired temperature, it greatly prolongs blade and disc life.
At the same projected service life, you can increase fired temp by 50F or so, giving increased power output.
Now I know how the blades fit into the main disk. Awesome. I am going to subscribe. Can’t wait for more video’s.
@crazyrum They are a high temp roll pin. You gently tap them into their mounting holes until they protrude into the slots in the base of the blades.
Imagine forgetting to install just 1 pin lock for the blades, just 1 is enough to destroy the engine!, this is some super delicate stuff that I do not ever wanna mess with.
Nice video..i m happy that i used to repair those blades...hpc and lpt..Airfoil..
The ceramic coating to the turbine blades of this J47 is an example of "hot rodding". We have taken a modern thermal barrier coating, and have applied it to increase the performance of this old engine.
It was never a service bulletin because the technology was developed after the manufacturer stopped supporting the engine.
As far as I know, this is the only J47 ever given this upgrade in thermal protection.
i could watch this stuff all day....
As a Quality Engineer who takes pride in providing quality product to my customers, it bothers me that when we manufacture these blades with the ceramic coating, we have to wear clean white cotton gloves and absolutely no part to part contact.. The specs alone on handling of these parts is crazy, and just to watch you slap 2 parts together and manhandle them with your bare hands is very unnerving.
Please note it was not me you had to watch. It's not a movie, and I do not direct the actions of others.
Thanks.
Worked on Rolls Wood group.. High standard... and I know exactly what you are saying.
We do our best tho..
Yeah, these guys aren't very bright. You can tell
Chromalloy has a joint-venture in Middletown, NY which is one of the largest operations of its type for surface treatment of turbine blades...
Making those blades is a Herculean task. GE perfected it.. They denied us the core engine tech. Never mind! We still admire their hardwork, skill, and finesse.
ohhh...gosh, that was my dream job, touching handling such a beautiful finest engineering product
That was naughty banging 2 blades together
Thank you for putting this things in internet super sir
Geezz this is awesome man....i like you re vids .....i like them a lot....very informative....keep up the good work!!!
JayZ. When you say ceramic blades, /do you mean metallic blade with a ceramic coating? Wow! and from 1953? Incredible!
Hello fella , I just would like to say tnks about your videos , Im are AMT instructor and inside of class room the students are just fascinated .
My best regards from São Paulo Brasil.
Alex
We sweep the floor every day, so a carpet would get dirty real fast. But a rubber work mat for jobs like this is a good idea !
I suppose... most sources call the turbine mounts firtee because they look like fir trees. The mounts on most compressor blades are called dovetail because, like the carpentry joint, they look like doves' tails.
Calling a turbine blade a bucket, and calling the mount a dovetail is a bit like calling the rear gate on a pickup a hatchback... not totally wrong, but just different enough to raise a questioning eyebrow.
Actually, these were called buckets back then, as they were designed by steam turbine engineers.
s3.amazonaws.com/dsg.files.app.content.prod/gereports/wp-content/uploads/2015/08/11203510/tumblr_inline_nsxs3jaQ031qzgziy_540.jpg
Originally created in the Admiralty Materials laboratory in Holton Heath Dorset. Also where the space shuttle tiles were developed.
"should i drop it on the floor?" lol
love how that guy cleaning the floor is just pushing it under the step ladder thing
Old video but good work jay
Those are just beautiful
I wish I had become an aircraft mechanic! Instead I went into health care.
I was in health care, but decided I worked better with machines than with people. Happier now.
@@AgentJayZ at 54, I don't know if entering a new field would be viable
Never underestimate the power of aptitude, enthusiasm, and determination.
I did, and it did me no good.
I'm surprised the weight varies so much blade to blade. I wouldn't expect more than a gram or two difference in high precision, identical and relatively small parts but there is more than 10g between some of them.
The high nickel alloy is quite heavy, and each blade is cast with a single use mould.
There is no area on the blade where material van be removed to adjust the weight.
sounds like a great field of research: Making a blade that is adjustable after being cast
@@AgentJayZ Can't you drill a little 1mm diameter hole into the face that's facing you when you insert the blades at 2:44? (I mean hypothetically. I know you can't ignore the repair manual IRL)
В 46. Году. Слесарь ..КОВАЛЕВИЧ за 4 месяца. Вручную сделал. 52. Лопатки на турбину. Разница в весе составила. Миллиграмы. Ну о размерах и говорить нечего....
It's very hard that TBC I spent many hours polishing them with diamond pads, what a few of you watching may not know is each one of those buckets (blades ) is weighed and that data is fed it a computer that works out where on the wheel they go in relation to each other for perfect balance hence the numbers
The computer gives a good starting point. The final balance is achieved by using the balance machine and making very small adjustments.
There is no power turbine in a turbojet like the J47. And the J47 uses a single stage turbine, so this is the first, last, and only stage...
The alloys have not changed a whole lot, but engines are firing hotter because of advancements in blade-cooling technology.
Beyond the scope of my little channel, really.
Dare I ask what that set of new old stock blades cost before the ceramic treatment? After the ceramic treatment? Awesome work! :)
i buy that for a dollar!
I appreciate your work great minds
I think the coating here is on a stage of the compressor section and that the coating is to prevent erosion on the blade surfaces that wears them down to where they will not function. You know like when you have someone sandblast your teeth to a fine point. I hate when that happens.
The turbine blades have a ceramic thermal barrier coating.
The function is in the name.
2:40 process of mental joy and satisfaction begins 😁😁
would see whole disk without skipping👍
Jay, thank you for sharing this all with us!
..and where I was before?😂
@docbipe Aahh,.... I can show you some of the techniques used by jet people, but to learn all of them, you must become one of us...
Thanks. Its hard to get a get a look at that end.
I like your work
Hey man, great work!! You really improve my theoreticall skills before making my attempt to ATPL theory exams :) Thanks.
Don't know for sure... but I would guess it is just the way things go in production.
I like how he tapped them together to make themvring.
@1metiz New? 2500.00 but you can't get these anymore.
To obtain one as a souvenir... their value is not measured in money, but in resoucefulness, courage, and a willingness to thrash back the boundaries of the great unknown.
An aviation scrap yard would sell them for the price of their mostly nickel content.
Ceramics have been able to withstand combustion temperatures of jet fuel since before humans wondered what that black stuff was that stuck to their feet while they were looking at the animals trapped in the pit full of it.
it was a good soundtrack. very nice
I didn't know they had Ceramic Matrix Composite parts on moving component, much less for an ancient engine like the J47!
"they" don't. We make 'em. And they are not that exotic. They are now original blades, with a ceramic thermal barrier coating applied, the same as all modern engines use.
I love how terminology differs in the same industry from company to company. We call them dovetail slots, but I tend to agree with you Jay, they look like fir trees.
Dovetails look like dove tails, and they are used on some compressor blades. Firtrees look like Fir trees, and are almost always used on turbine blades, because they are a stronger joint.
I am surprised you don't know that they are two different things.
made me cringe, watching those blades been tapped together !!
my first thought was (what an as***e)
probably the same guy sweeping the dust under the equipment.
That's satisfying to watch
thanks for introduction，very nice！
BEAUTIFUL! Engineering at it's best!!
cool stuff. Balancing is a pain. When you are new.
ive had the luck to be shown and taught the process to apply the TBC.
These are withouten Coolsingel whiteboards Some of them ABB use for the first stage And Second stage blades with cooling And the Thierry stage also does not use Cooling holes
You are not making any sense.
blades in place , and engine is redy for turbo boost , nice video ,,,,!!!!
Just when I thought I had some cool projects going on in my shop.
@FrontSideBus yes, it was the nozzle we opened first...
I can honestly say, i dont miss removing Service Run Blades on a Siemens G Machine AT ALL! Especially Row 16😑😫
wow, I wonder how they made the coating back in 1953... for sure they used the latest technology for these military engines now matter how much it cost
Without internal cooling I don’t see why bother with getting YSZ on them other than to prevent oxidation if that’s a concern but then you could just get them bond coated and do just fine. Not sure what aftermarket cost difference looks like but with such thin blades the top 3/4 won’t even know the bottom is being cooled by contact with the ring/hub
Also the variance is somewhat on purpose to deal with harmonics. You don’t want every single blade to enter their intrinsic frequencies at once that would end .... poorly.
Edit : stop calling them ceramic blades , that’s a whole other thing being worked on with cmcs
You do not understand how the blades are cooled, so you don't see a point in a TBC. Don't you give me orders, buddy. Read the freaking description.
@@AgentJayZ I have proper modern blades sitting on my desk and a basic book on transport phenomena but never try to argue with “experience” on 70 YO tech I guess. My literally job is thermal testing these coatings and matls.
I get you’re a tech working on these all day and read plenty of literature but I sit and stare at thermal models for how to cool these things what sort of heat transfer they have etc. Nickel has incredibly bad heat transfer. The YSZ does reflect some IR and provides oxidation protection but if you’re not pumping air up the core last half of the blade barely knows the disc is there holding it from a heat transfer perspective so this blade isn’t “cooled” unless I sorely missed some sort of passages on them. Reflecting IR doesn’t provide cooling. It only reduces heat transfer.
Satisfactory video
Adequate comment.
the ceramic can witstand heat but isnt it BRITTLE??
you have such a cool job dude would love a job like that but why don't you put a carpet on the floor could only help if u drop one or are you really that crazy good at ur job. love the video learned a lot
watching this is extremely satisfying
Sound if,it was,tuned like,a musical instrument
Are you referring to the forward stub shaft or the distance piece? Perhaps you're referring to bucket wheels which have radial slots for bucket cooling air.
When he knocked them together I had a moment of pure panic
Me too!
Sabre? You should try and get work on a MiG-15 or 17. Beautiful planes that i know very little about internally. Would love to see them on here.
What else should I do...?
I feel it would be very interesting for an agentjz however covering reciprocal, rotary engines.