Another educational video. Quite interesting to novice like me.
@StigAviation11 ай бұрын
Glad you enjoyed it!
@jgaffney611 ай бұрын
Great video learned a lot. 👍 Thanks for your time !
@StigAviation11 ай бұрын
No no no. Thank YOU for your time and being here.
@ashrafshadid587011 ай бұрын
Good mechanic keep learning, your channel always teaches me it’s very useful video thank you Stig
@StigAviation11 ай бұрын
Even myself, even after all these years, I am still a student, and always will be a student of Aviation. I will always do my job and keep on studying to become a better mechanic for tomorrow.
@mikecappa109411 ай бұрын
It makes me comfortable knowing such a knowledgeable and caring and committed individual is taking care of the engines that fly me across oceans and continents. Thank you for your dedication to the craft. Millions appreciate you !
@StigAviation11 ай бұрын
Thank you for the kind words. I appreciate you.
@jonbradshaw338511 ай бұрын
I would love to see one of these engines up close!
@StigAviation11 ай бұрын
There are a few museums that you can visit that have these engines on display, I highly encourage you to check them out.
@aviatordiego476911 ай бұрын
Yes indeed, many museums let you get up close with the airplanes and engines, definitely worth the research.
@jonbradshaw338511 ай бұрын
@@aviatordiego4769 thank you! I will definitely check into one that I can go to.
@ruirodrigues695611 ай бұрын
Absolutely amazing your explanation ...
@StigAviation11 ай бұрын
Thank you very much sir.
@aaronchandler238011 ай бұрын
Oh, now you brought a tear to my eye… the JT8. She put a lot of food on my table over the years… I miss her.
@StigAviation11 ай бұрын
Same here my friend. Same here. I think I lost count on how many I hung and dropped from aircraft such as 727s and MD 80s, not to mention the upgrades for the hush kit we used to do, well that was a nightmare. 😅
@aaronchandler238011 ай бұрын
@@StigAviation I know all about them hush kits, i “absolutely,positively “ do… if you know what I mean. Great videos too my friend!
@sheldonbattle19358 ай бұрын
I'm involved in the manufacturing of mainshaft bearings for all these customers and engines. It's fun hearing and seeing the names JT8D, GE90, Pratt NEO, LEAP and many other programs we support, incredible engineering.
@StigAviation8 ай бұрын
Thank you for all the incredible work you do to develop these engines
@bmused5511 ай бұрын
The JT8D was EVERYWHERE. It is as important to the history of civil aviation as the Comet or the 747. My last JT8D powered flight was on an AA MD82 from DFW to JAX. I sat right on front of the No.2 engine. Oh man, that scream and whine. I miss it. But my favourite of all is the RB211. NOTHING sounds like it at take off power. That buzzsaw sound is music. It was also an important engine in aviation. My last RB211 flight was a BA 747-400 from LHR to DFW. A glorious concerto of four RB211's
@StigAviation11 ай бұрын
Indeed, the RB 211 was iconic, matter fact if you look closely and listen closely, you can actually hear its remnants in the V2500 engine. Even though it’s not a triple spool, but it still has that distinct buzz saw noise.
@vorlonb39 ай бұрын
loved that stig thanks for taking the time to explain it.
@StigAviation9 ай бұрын
My pleasure. Thank you for watching
@DavidGlover55511 ай бұрын
Awesome video Stig! I buy parts for the engines of one of these Manufacturers and learning more about the technology is just insane! Keep the videos coming! Love them as an Avgeek!
@StigAviation11 ай бұрын
Right on! Thank you for enjoying and always learning 👍
@Notmahfoozkhan11 ай бұрын
Thanks a bunch for the video , really enjoyed it.
@StigAviation11 ай бұрын
My pleasure! Thank you for watching
@seanmcerlean11 ай бұрын
Awesome Stig.😊
@StigAviation11 ай бұрын
Thank you! Cheers!
@jay-117211 ай бұрын
I finished electricity last week. Just started General Aviation maintenance. Aircraft drawings and graphs so far.
@StigAviation11 ай бұрын
Study well Jay. It’s gonna come in handy when you actually start working
@hugostiglitz4711 ай бұрын
You're my hero Stig. Cool vid🎉
@StigAviation11 ай бұрын
I’m no hero. Just a wrench my friend. I’m just happy you enjoyed the video. Always appreciate your support
@gumnaamaadmi00711 ай бұрын
Loved the trip back in time, Stig! Just as I loved the smoky, noisy take-offs of early 737s fitted with the JT8Ds. They were soon hush kitted, but I am not sure it made much of a difference :)
@StigAviation11 ай бұрын
Oh, i used to install those hush kits, it didn’t help at all. It was still earth shattering loud. 😂🤣
@paoki4everole8 ай бұрын
Another good old bulletproof engine is the J79-GE-10. I did my apprenticeship on one of these last year assisting the engineers to its assembly. 12000 and something pieces. What an experience
@StigAviation8 ай бұрын
I bet you learned a lot
@paoki4everole8 ай бұрын
@@StigAviation I did! Another question. I have an interview with the sit manager for a line maintenance mechanic. Could you give any examples of what questions are they gonna ask regarding the technical part?
@bryandunawey11 ай бұрын
Great video as always
@StigAviation11 ай бұрын
Glad you enjoyed my friend. 👍
@ScapoloMichael11 ай бұрын
Triple spool vs geared dual spool is the hot topic these days. Both about the same weight. Dual spool has a smaller radius of the shafts and this has benefits with compressor tip speed, although compressors are fast anyway. Also, a triple spool whilst better than a normal dual spool for fan speed still isn't as good as a geared dual spool, as the third stage turbine can only be physically made so slow, whereas the geared engine can have the fan spin even slower than that. 'course, the big issue with gearboxes is their potential to grenade the whole engine. They're small yet have to channel the kind of horsepower that could easily propel a ship. Lots to go wrong, so lots to get right. It'll definitely make the job of the maintenance engineers even more interesting in future
@StigAviation11 ай бұрын
You’re starting to see a trend where technology is kind of hitting a wall at this point, they are getting to a point where they exceeding the speed of sound for the blade, rotation, and speed. It’s going to be interesting in coming years of what they developed.
@ScapoloMichael11 ай бұрын
@@StigAviation I'd like to see intercooling of compressor air between stages, and maybe even recuperation of exhaust heat to preheat stage two compressed air before combustion. Both were already under study 20 years ago but haven't been tested yet full scale. There's other ideas like active cooling for the turbine cooling air that's bled off the compressor, instead of using it hot, variable diameter compressor cowls that can shrink or expand with the temperature of the blades, massively widening the engine's efficiency across the powerband, and other stuff, including the sexy variable pitch fan idea. All chasing a percentage or two of extra efficiency. All of it needing 99.x% reliability. What I really wanna see, but it might not be practical, is a contrafan. With a two stage front fan spinning in opposite directions, the second one smaller and faster, and the shroud around it tighter, precompressing the air before it reaches the first stage compressor (which can now have fewer stages) and giving the fan thrust of a much bigger, heavier fan with the low drag of a smaller one, plus smaller fans can spin faster without supersonic blade tip issues. It could be a triple spool with the first fan on the third stage turbine and the second, faster fan on the second stage compressor turbine, or a dual spool with a gearbox. It would be expensive and heavy even with composite fans and fan shroud, so best for long haul engines. And it might turn out to be shit 🤣
@StigAviation11 ай бұрын
@@ScapoloMichael how about we think into the past and get inspiration from there, why have all these moving parts, think, scramjet, think ramjet, how about no moving parts and figure out a way to optimize compression. But I’m just thinking out loud 😂
@ridewitharko11 ай бұрын
Love & support from India 🫡
@StigAviation11 ай бұрын
Thank you very much, cheers from LAX
@TheBeagle5811 ай бұрын
Nothing sounds better than the RB211 on take off roll, other than the GE90😁 and that's the new kid on the block in comparison lol! The next GE for the 777-9 is the next best thing, modern day.
@StigAviation11 ай бұрын
The GE9x is going to be incredible. 👌
@TheBeagle5811 ай бұрын
@@StigAviation Back in the 70's, the landings used to be as fun as the take off and rotate for the engine sounds. When they reverse thrusted, it was exciting 🤣😂🤣. Today, it's so different with noise abatement tech and such. Still, the reigning champion, on an overcast weather day is the Rolls. The way they chop up dense air, is like no other and you need not look for the bird, the sound has its own unique signature. The DC9/ mad dogs, also had this reputation with loud crackling from the exhaust. My goodness. That and the flame throwing that came from the 707's. Talk about a great time to be around aviation.
@voytekcyvr193611 ай бұрын
I am happy to see such a marvel of technology, thanks. Just wonder what will power those flying machines in the future.
@StigAviation11 ай бұрын
Technology will probably get to a point where we will minimize components, it will be more efficient with less moving parts, think scramjet, or ramjet.
@Gavin7177-xq4pb11 ай бұрын
🔥
@StigAviation11 ай бұрын
👍
@theLeftHandedDog11 ай бұрын
I've read that most internal combustion engines in cars are only about 30 % efficient at best, which is one of the reasons electric cars--which I think are close to 100% efficient--are transforming that industry. I'm not sure how efficiency is measured, but I'm wondering how efficient these jet engines are? Do we have figures on that? Thanks.
@StigAviation11 ай бұрын
Efficiency is a bit above my pay grade in regards to actual numbers and figures, that’s more of engineering and manufacturing level data. But from what I understand and read, efficiency is somewhat calculated of longevity and economic values (fuel economy, component reliability, maintenance costs)
@njjeff2017 ай бұрын
Thanx again Stiggy ✈️
@StigAviation7 ай бұрын
Any time!
@hellcat916511 ай бұрын
after your last video I just had to subscribe, could not wait till the next vid and here we are. thanks bro =) keep it up
@StigAviation11 ай бұрын
Awesome, thank you! I appreciate you being here and enjoying.
@Bruins77Fan11 ай бұрын
Our GTF engines have taken some heat...but the kinks will be worked out...its concept and design are incredible.
@StigAviation11 ай бұрын
It truly is incredible design. I appreciate that but what I don’t like is that PW likes to hide everything under the core. You want any maintenance done you have to open the whole thing up. I’m more partial to the CFM family. Much easier to work on.
@andreweppink449811 ай бұрын
Trouble is GE's gonna have to bite the bullet and go to a reduction gear setup like Pratt & RR. No two ways about it. Running fan blade ends greater than supersonic is just nuts. Very inefficient. Engines with reduction gears are also much quieter, and smoother.
@StigAviation11 ай бұрын
You are right on that, they are reaching as stage where they need more innovation and new technology. We will see what comes in next generation of these monster engines.
@dankuettel506311 ай бұрын
The JT8 was even used in the SAAB Viggen
@StigAviation11 ай бұрын
Very interesting. I didn’t know that. Thank you for the knowledge.
@outrageousexistence11 ай бұрын
My current A&P school has a retired fedex boeing 727 on display, powered by three JT8D engines. One of the engines was taken out of the plane, as well as the APU for teaching purposes. I really love that thing! so interesting. unfortunately, when they transported the plane down to my school, it was “too heavy” to land at the nearest airport 100 feet away. (it wasn’t too heavy) so they took the wings off the plane and shipped it down here. none of the hydraulic or electrical equipment works because they cut it out.
@StigAviation11 ай бұрын
I’m curious what school this is. And that’s unfortunate they did that. I wish they gave you the whole aircraft intact
@outrageousexistence11 ай бұрын
@@StigAviation Arkansas-State university mid-south. it’s near Memphis Tennessee !
@martinross552111 ай бұрын
Really interesting to see these up close, Stig. Was the RB-211 developed for Concorde? I’ve noticed in Royal Navy vessels too. Hope the Ultra Fan becomes available soon!
@Iwishiwasflying11 ай бұрын
747
@martinross552111 ай бұрын
@@Iwishiwasflying Wikipedia says the L1001 Tristar was the first user, also in 747s
@Iwishiwasflying11 ай бұрын
@@martinross5521 valid point but the 747 lasted longer than the Tristar. So one could infer that the 211 was more for the 747 aka 743 and 744
@ScapoloMichael11 ай бұрын
They tried the first composite fan, Hyfil. Shattered in the birdstrike test. Rolls Royce nearly went bankrupt coming up with a traditional alternative, had to be bailed out by the UK taxpayer. Lockheed was therefore late with the L1011 which doomed the plane to low sales. Rolls were so traumatised they haven't used composite blades since, until the Ultrafan, which will also have a gearbox.
@StigAviation11 ай бұрын
From what I remember, the RB 211 was specifically created for the L1011 , also the classic 747.
@andrewdavy992111 ай бұрын
Hi I love all your videos you're a genius, Are you looking forward to the Boeing 777x coming into service?
@StigAviation11 ай бұрын
Thank you Andrew. Yes indeed I’m looking forward to seeing the 777x advancements , I’m not sure if my carrier will be purchasing them tho.. seems like we are more invested into the 787 fleets for wide body aircraft. Nonetheless I’m still excited about the new 777 and its subsystem architecture.
@andrewdavy992111 ай бұрын
@@StigAviation I always see the American Airlines 777s at London Heathrow especially the ones going to LA, have you ever been over here to England?
@StigAviation11 ай бұрын
@@andrewdavy9921 many years ago.. but I’m way over due for a visit. I’ll fly there soon
@PRO-PLANE11 ай бұрын
Diesel ??)))
@StigAviation11 ай бұрын
Jet A is basically very refined Diesel. It has a higher flashpoint.