Very nice Story - Little sad the shaft - saw - part, but very impressive, how long - durable theese High - pressure - Turbine - blades are.
One Question: must it be feeded by liquid Kerosene (the usual Jet - fuel A) while compressing and moving natural gas in a Pipeline, or could it also use this same natural gas, which is moved by the engine?
@alexl162 It gets to live. Instead of being scrapped and melted down, some of its parts will be turning, burning fuel, making power. The parts used will have a useful service life of ten times what they ever saw in an aircraft engine.
Something I've been wondering, and hoping you'll show, is how the cooling air is pushed through the turbine blades and stators. Where's it come from, how it is pressurised, how it gets into the first stage turbine hub for expulsion through the blades?
@deSloleye cooling air must flow, so it needs to be of a greater pressure than where it's going. The stg 1 HP turbine nozzles are almost at the highest air pressure in the engine, so the only source of air is from the point of highest pressure, immediately aft of the last stg of compression. This is called Compressor Discharge Pressure air, or CDP for short.
At full power, this air can be 600 degrees F, but is still "cooling" to nozzles subjected to 1500 or so degree gas flow.
The power of a Turbine engine is mind boggling! The Y2K Motorcycle uses a small Turbine engine and goes over 200mph and uses a lot of fuel. I'm wondering if a small turbine engine will ever be used in place of a Semi tractor trailer's diesel engine?
@DrWestofReanimation Those questions do not have answers. The turbine rotor has dimensions for its seal segments, but not for overall diameter. It is what it is, and if in servicable condition it is accepted. Its size is not listed or measured.
The turbine blades are very complex pieces with many inspection dimensions listed. Overall length is irrelevant, since the bottom of the entire blade resides in a void in the mounting slot.
@DrWestofReanimation Length of each blade is also not specified, but is one of those things measured in manufacturing. What is an inspection dimension, and is measured when building an engine, is overall diameter of the turbine at each stage of blades, with the blades installed.
That dimension is different at different points along the axis of rotation of the turbine.
I was looking at that table of inspection criteria yesterday, but I can't remember what they were.
No problem, it's all cool. Enjoy your videos and I'm glad you are providing people like me to see the workings of the jet engine, for the most part people here in the united states would not be allow too. Thank you, great videos.
Fantastic tear down and rebuild of the CF6/LM2500! Are you going to start it up on the test stand when it's finished and will we be able to see the video? Thanks so much for your efforts in showing the interesting guts of turbine engines!!!! Bruce in California, N6THN on the ham radio.
Jay i still dont understand how the turbine is 'screwed' to the shaft? Am i right in thinking it is screwed? Im all confused, My understanding from what i can see is the turbine assembly gets screwed (extremely tightly) onto the shaft the drives the compressor is this right or am i barking up the wrong tree?
@xxJohn1977xx The two are indeed held together by a threaded connection, but the tension produced by that coupling being torqued is used to hold the splined sections of each in contact. Much like tha LM1500, the force to turnn the compressor, supplied by the turbine, is transmitted through the spline; the coupling holds the spline together.
@xxJohn1977xx It's a bit like the sprockets on the back of a mountain bike: the cogs are slid onto a plined freewheel, and it is the splines that transmit the pedaling power from the chain to the wheel. The nut holding the cogs on the spline is not directly involved in power transmission.
So in the video one of your guys dropped a shaft into the centre of the turbine assembly. Im guessing that was basically like the socket and extension bar of a ratchet and the beast torque wrench would of been the ratchet/breaker bar.
The only bit i cant get my head around is what was it you was actually undoing? Was it a huge nut of some kind?
@xxJohn1977xx Infact i think ive found the part you undid with the torque wrench. Is it like a variant of the main coupling in your video - J79 Main Coupling - Turbine Engines: A Closer Look
@xxJohn1977xx Yeah, it's a a captive nut inside the turbine shaft.
Actually, because it has splines on the inside ( they engage with the tool dropped in), and threads on the outside to screw into the compressor shaft... technically it's a bolt, but because it is in the shape of a nut, it's called a nut.
So what are you actually using all that torque to do - you mentioned a coupling that wasn't really a nut, more like a shaft - that I assume holds to turbine to the shaft. That's probably a wrong assumption, as looking back, you had a video that showed a turbine to compressor shaft coupling nut that used only 200 or so ft/lb. Thanks in advance for clarifying.
@tyroneorourke The tube / nut / coupling in the LM2500 is torqued to 90,000 in-lbs, which is 7500 ft-lbs... but sometimes these things get stuck and really don't want to come apart.
Usually the 10,000 ft-lb wrench will do for disassembly. Sometimes you need to call out the big guns...
And it's not just about available force... sometimes to have precise control when applying a large force, you need an overwhelmingly powerful tool. Unstoppable, you might say.
Since in the last clip, you said that that an operational CF6 is worthless, you guys should reblade the fan, mount it on a stand and get a decent sized electric motor to continuously spin it, as kind of a billboard for your shop....just a thought.
@FrontSideBus Nah, unless they would be thieves also had the spline drive torque adapter, think it would be quite a task for someone to steal them...besides the engine has been just been sitting there in front of the shop for some time already. The blades would probably be safer bolted into the fan, than they are stored loose in the storage tent.
sometimes I want to change my career from IT to being a turbine mechanic... great videos, very interesting, thank you!
74HC138 1 week ago
I think i stick to my turbocharger jet
scuffieduffie 2 weeks ago
Very nice Story - Little sad the shaft - saw - part, but very impressive, how long - durable theese High - pressure - Turbine - blades are.
One Question: must it be feeded by liquid Kerosene (the usual Jet - fuel A) while compressing and moving natural gas in a Pipeline, or could it also use this same natural gas, which is moved by the engine?
Pyanities 3 weeks ago
@Pyanities These industrial enginesthat pump natural gas in a pipeline do use the gas from the pipeline for their fuel.
AgentJayZ 3 weeks ago
6:11 30000 ft lb = 40674 Nm (felt like pointing out the conversion)
hboy007 3 weeks ago
Im so bummed the CF6 had to die ;_;
alexl162 3 weeks ago
@alexl162 It gets to live. Instead of being scrapped and melted down, some of its parts will be turning, burning fuel, making power. The parts used will have a useful service life of ten times what they ever saw in an aircraft engine.
AgentJayZ 3 weeks ago
5:18 thats a BIG cat !
CxC2007 3 weeks ago
Something I've been wondering, and hoping you'll show, is how the cooling air is pushed through the turbine blades and stators. Where's it come from, how it is pressurised, how it gets into the first stage turbine hub for expulsion through the blades?
deSloleye 3 weeks ago
@deSloleye Interesting question. I imagine the cooling air comes from bleed air taken from further forward in the engine maybe?
xxJohn1977xx 3 weeks ago
@deSloleye cooling air must flow, so it needs to be of a greater pressure than where it's going. The stg 1 HP turbine nozzles are almost at the highest air pressure in the engine, so the only source of air is from the point of highest pressure, immediately aft of the last stg of compression. This is called Compressor Discharge Pressure air, or CDP for short.
At full power, this air can be 600 degrees F, but is still "cooling" to nozzles subjected to 1500 or so degree gas flow.
AgentJayZ 3 weeks ago
Thumbs up if you looked up "skookum."
corrodesthefilm 4 weeks ago 6
@ricvis. It's doubtful, the fuel consumption of a turbine is high compared with a diesel engine of similar power output.
tranceaddict704 4 weeks ago
The power of a Turbine engine is mind boggling! The Y2K Motorcycle uses a small Turbine engine and goes over 200mph and uses a lot of fuel. I'm wondering if a small turbine engine will ever be used in place of a Semi tractor trailer's diesel engine?
ricvis44 4 weeks ago
What's the dimensions for the piece on the balancer and length of the blades? lol
DrWestofReanimation 4 weeks ago
@DrWestofReanimation Those questions do not have answers. The turbine rotor has dimensions for its seal segments, but not for overall diameter. It is what it is, and if in servicable condition it is accepted. Its size is not listed or measured.
The turbine blades are very complex pieces with many inspection dimensions listed. Overall length is irrelevant, since the bottom of the entire blade resides in a void in the mounting slot.
AgentJayZ 4 weeks ago
@AgentJayZ
Just curious, and I understand if it's confidential. =P That was my goal as a mechanical drafter was help design and draw engines.
DrWestofReanimation 4 weeks ago
@DrWestofReanimation Length of each blade is also not specified, but is one of those things measured in manufacturing. What is an inspection dimension, and is measured when building an engine, is overall diameter of the turbine at each stage of blades, with the blades installed.
That dimension is different at different points along the axis of rotation of the turbine.
I was looking at that table of inspection criteria yesterday, but I can't remember what they were.
AgentJayZ 4 weeks ago
@DrWestofReanimation Sorry if that seems wordy, windy, or that I'm trying to BS you, but that is the real answer, as succinctly as it can be given.
AgentJayZ 4 weeks ago
@AgentJayZ
No problem, it's all cool. Enjoy your videos and I'm glad you are providing people like me to see the workings of the jet engine, for the most part people here in the united states would not be allow too. Thank you, great videos.
DrWestofReanimation 4 weeks ago
Fantastic tear down and rebuild of the CF6/LM2500! Are you going to start it up on the test stand when it's finished and will we be able to see the video? Thanks so much for your efforts in showing the interesting guts of turbine engines!!!! Bruce in California, N6THN on the ham radio.
n6thn 4 weeks ago
Jay i still dont understand how the turbine is 'screwed' to the shaft? Am i right in thinking it is screwed? Im all confused, My understanding from what i can see is the turbine assembly gets screwed (extremely tightly) onto the shaft the drives the compressor is this right or am i barking up the wrong tree?
xxJohn1977xx 4 weeks ago
@xxJohn1977xx The two are indeed held together by a threaded connection, but the tension produced by that coupling being torqued is used to hold the splined sections of each in contact. Much like tha LM1500, the force to turnn the compressor, supplied by the turbine, is transmitted through the spline; the coupling holds the spline together.
AgentJayZ 4 weeks ago
@xxJohn1977xx It's a bit like the sprockets on the back of a mountain bike: the cogs are slid onto a plined freewheel, and it is the splines that transmit the pedaling power from the chain to the wheel. The nut holding the cogs on the spline is not directly involved in power transmission.
AgentJayZ 4 weeks ago
@AgentJayZ I think i kind of understand now....
So in the video one of your guys dropped a shaft into the centre of the turbine assembly. Im guessing that was basically like the socket and extension bar of a ratchet and the beast torque wrench would of been the ratchet/breaker bar.
The only bit i cant get my head around is what was it you was actually undoing? Was it a huge nut of some kind?
Sorry for the dumb questions in advance!
xxJohn1977xx 4 weeks ago
@xxJohn1977xx Infact i think ive found the part you undid with the torque wrench. Is it like a variant of the main coupling in your video - J79 Main Coupling - Turbine Engines: A Closer Look
xxJohn1977xx 4 weeks ago
@xxJohn1977xx Yeah, it's a a captive nut inside the turbine shaft.
Actually, because it has splines on the inside ( they engage with the tool dropped in), and threads on the outside to screw into the compressor shaft... technically it's a bolt, but because it is in the shape of a nut, it's called a nut.
Don't worry... it's supposed to be confusing :)
AgentJayZ 4 weeks ago
Hallo the LM2500 is based on a earlier version of the CF6-50 or is it a different one ?
matzele747 1 month ago
That's 66,000 foot pounds at 3600 RPM too!
oisiaa 1 month ago
Your hydraulic torque wrenches intrigue me. My inner tool geek desires a manufacturer name so I can admire specs, haha!
lazystart 1 month ago
@lazystart Check out the aircraft division of Hydratight 's website. I'll check our tools tomorrow
AgentJayZ 1 month ago
@lazystart Advance Manufacturing, in Westfield Mass. is where both our torque tools came from.
AgentJayZ 4 weeks ago
Word of the day: Skookum ! AgentJayZ is Skookum =)
zero00tolerance 1 month ago
That much of torque on a car's engine... and a blonde driving it.
SHE STILL CAN STALL THE ENGINE ! :D
naaahhhh that number is nothing :P
TehVag 1 month ago
133000 ft-lb = Shop Kitty clearly unimpressed
saxonlight 1 month ago
@agentjayz I got myself a 14 inch titanium blade, how would I clean the embedded soot off it or is it impossible?
ASSEMblerEX 1 month ago
@ASSEMblerEX Glass bead blasting. If that's not working, 400 grit sandpaper and then glass beads.
AgentJayZ 1 month ago
I think I'm ready to rebuild an LM2500 now =D
memadmax69 1 month ago
thx for information man
you are always helpful
MrGAZZAH1 1 month ago
So what are you actually using all that torque to do - you mentioned a coupling that wasn't really a nut, more like a shaft - that I assume holds to turbine to the shaft. That's probably a wrong assumption, as looking back, you had a video that showed a turbine to compressor shaft coupling nut that used only 200 or so ft/lb. Thanks in advance for clarifying.
tyroneorourke 1 month ago
@tyroneorourke The tube / nut / coupling in the LM2500 is torqued to 90,000 in-lbs, which is 7500 ft-lbs... but sometimes these things get stuck and really don't want to come apart.
Usually the 10,000 ft-lb wrench will do for disassembly. Sometimes you need to call out the big guns...
And it's not just about available force... sometimes to have precise control when applying a large force, you need an overwhelmingly powerful tool. Unstoppable, you might say.
AgentJayZ 4 weeks ago
Your channel always amazes me!! Love the vids and keep up the good work.
rlvilleman 1 month ago 9
Since in the last clip, you said that that an operational CF6 is worthless, you guys should reblade the fan, mount it on a stand and get a decent sized electric motor to continuously spin it, as kind of a billboard for your shop....just a thought.
krbruner 1 month ago
@krbruner It wouldn't last long... those blades would be £££ in scrap metal :)
FrontSideBus 1 month ago
@FrontSideBus Nah, unless they would be thieves also had the spline drive torque adapter, think it would be quite a task for someone to steal them...besides the engine has been just been sitting there in front of the shop for some time already. The blades would probably be safer bolted into the fan, than they are stored loose in the storage tent.
krbruner 1 month ago
133000 ft-lb = 180324 Nm for us metric guys. :)
PukinDog68 1 month ago 5
What was that Canadian word that you used?
n7275 1 month ago
@n7275 Oh, yeah...you probably mean Skookum... it leans toward meaning tough, or rough, or heavy duty.
I think it's origins are in the language of the indiginous peoples of Canada's west coast.
AgentJayZ 1 month ago
@AgentJayZ 5 stars, thx for information, The engine is big, similar to an 747 or air bus engine size?LM2500 How many hp is this engine ? Regards
energyalt56 2 weeks ago
@energyalt56
The CF6-6 was used to power the DC10, the Airbus A300, and as it was developed into the CF6-50 and -80, it was used to power some 747s.
The LM2500 was originally designed to make 25,000Hp. It has also been developed over time, and the last one we put together was rated at 34,800Hp..
AgentJayZ 2 weeks ago