Rolls Royce Olympus VI

[@GentlemanGames]

I wish more people with cool professions did these sorts of videos! I love learning about everything I can, so videos like this are a beautiful thing, to me.

[@Hercules718]

GentlemanGames exactly. I can’t stop watching these. Very cool and interesting.

[@seafirefr.4751]

The thing is, we never have time. What people forget is, it is our job, it’s no different from everybody else’s, imagine what would happen if you got caught by your manager on your smartphone, we’re no different.

[@Aussie50]

Fantastic!, that is an amazing engine!. even before combustion starts the noise is just incredible!

[@motormouser]

The only thing better than watching an Olympus being put through its paces,is four of them at take off in the Vulcan!

[@tomtd]

The Fred Dibnah of the jet era. Love it, such running in the blood enthusiasm for engineering. Respect.

[@herpes010]

The sheer volume of air, so impressive!

[@HuntersMoon78]

I've seen the Vulcan Bomber a few times, beautiful aircraft and the howl is awesome

[@grahamj9101]

Hello again, JayZ, and thanks for the nostalgia trip - but then nostalgia isn't what it used to be. It brings back memories of my time at R-R IMD (1967-82) and (as I've told you before) designing the Oly 'C' LPT blade: that must have been in 1971, immediately after the bankruptcy. I had previously been working on the Marine RB211 project and that was cancelled, as a result, only to be resurrected a couple of years later as the Industrial RB211. For Tyler H's information, Bristol Aero Engines amalgamated with Armstrong Siddeley Motors in 1958, to form Bristol Siddeley Engines, which was taken over by Roll-Royce in 1966, so that, just as I finished my apprenticeship with BSE Coventry, the change of name was introduced, and I had to apply to join R-R. In another video, you've shown us the lacing wires (that's what we called them) in the LM1500 power turbine: they are, of course, for blade vibration damping. The original Ind Oly 17.5MW power turbine and the Marine Oly TM1/2/3 power turbine had lacing wires, 'inherited' from the ASM Sapphire 7 turbine. We then moved on to interlocking shrouds,with the first new design application at R-R IMD being in the Oly 'C' HP and LP turbines. On the subject of two-spool engines counter-rotating, the HP and LP spools of the Pegasus in the Harrier 'jump jet' do so, specifically to eliminate gyroscopic effects. The two spools of the EJ200 in the Typhoon contra-rotate and the HP spool in the latest marks of 3-spool Trent turbofan contra-rotates relative to the IP spool and the fan.

[@AgentJayZ]

Thanks for the info. Please feel free to correct and educate us. You may be the most knowledgeable of my 26,500 subscribers... you are a subscriber, aren't you ?

[@grahamj9101]

AgentJayZ Hello again JayZ, Yes, the little box at the top shows 'subscribed'. Let me reassure you and compliment you: you're doing pretty well at educating your subscribers on the intricacies of the gas turbine.

[@grahamj9101]

AgentJayZ Hello again JayZ, The Canadian Lancaster is over here in the UK and flying with the BBMF Lanc at several air shows. It's a once in a lifetime opportunity to see the two together - and the Vulcan is appearing too. Yes, it's 200 series engines are running out of hours, but so is the airframe, I believe. Whether the UK CAA would accept an engine overhaul done by Maddex, I've no idea. I suspect it might be a question of trying to get hold of aero standard (B-prefix part number) parts, because I couldn't see bureaucracy accepting any industrial (BDA-prefix?) part numbers, even though they had to be every bit as reliable - if not more so. I indulged in another nostalgia trip and looked at the photos of the Oly 'C' on your websites, which reminded me that there was another bit of my work on the engine. The combustion chambers have the machined cooling rings 'borrowed' from the 593-3B Concorde prototype engines, before the annular vaporiser chamber was introduced for production. The interconnectors appear to have little air scoop features to feed the cooling ring holes immediately downstream of the interconnectors. This was introduced as an in-service mod as a result of local overheating and was my idea, based on a much more complex arrangement in the 593. How effective has it been over the years?

[@grahamj9101]

AgentJayZ Hi JayZ, I know the connection between the Olympus and what I'm going to tell you and your subscribers is courtesy of Avro, but yesterday (Saturday) I had the experience of seeing two Lancasters and hearing eight Merlins, as they flew overhead at low level. They were awesome.

[@titaniumdiveknife]

@@grahamj9101 you're awesome!

[@PeterSCampbell]

Don't get me wrong, I love the J47 and the J79, but this...this was really cool. There is something very special about the sound of this engine. I think I will watch this video again...

[@trainedwarrior502]

No start cart, just a Start cat.

[@danilorosich]

Clever!

[@subramanyamgovindavarjhull8447]

TrainedWarrior PC NJ to m y

[@electric_photon4660]

That was the most beautiful engine start I've ever heard.

[@hendrikhendrikson2941]

A-MA-ZING, I could listen to this for hours :) And thank you for showing us the spin-down as well. That clinging sound of the fan blades is a thing of beauty!

[@bagelboi66]

I never watch these things naked. I *swear* :D

[@beagle7622]

Much smaller intake Diameter than I would have thought. The shear (right term?) must have been huge: no wonder it was noisy. Fantastic video. I saw one of the pre production Concordes at Melbourne Airport and they were running the engines are for about half an hour. Most of the of the people around me commented on how noisy it was. That was 1975., the last and only time I saw one flying.

[@StonyRC]

What a RUSH just from watching the movie. You guys have the coolest job ever!

[@poly_hexamethyl]

5:10 Yow! Brave cameraman, getting that close to the intake when that thing is running!

[@RobertMaddox]

Wow! what a monster! The turbine engine is such a work of art.

[@slicershanks1919]

That's the most beautiful startup I've ever heard

[@grahamj9101]

Hello JayZ, I'm glad I took the opportunity to see the two Lancs last week, as the Canadian Lanc is now grounded with an engine problem. However, I will still go to Bournemouth tomorrow for the Air festival and to see that other Avro classic, the Vulcan, and hear the unique sound its four Olympus engines. The Vulcan to the Sky Trust is asking for GBP200k of donations to ensure its airworthiness for next year's air show season, which will be its last, they say. After that, they will maintain XH558 in a serviceable condition and taxi it every so often: very sad, but probably inevitable. So, JayZ, it is highly unlikely that Maddex will be asked to overhaul any Olympus aero engines.

[@Steamerbeen]

Amazing! They were in the avro vulcan & concorde, love the yanks for keeping history alive.

[@AgentJayZ]

We are located a little north of where you think there, bub.

[@rreiter]

That was thoroughly enjoyable, thank you. I actually just watched your Olympus series again recently and it really does look different now. And your footage clearly shows just how much gas that thing generates.

[@jayryia]

Would love to just have had a video of this with just the pure sounds from the front... no moving or cutting of the video or anything... just to hear that heavenly full spool...

[@mikec1163]

Me too. Start up to shut down from the front- no cuts :)

[@SKNK5050]

Awesome . Olympus is always a jaw dropper . lush sound , can only imagine the bass on startup lol , I imagine its a little like standing next to a funny car on launch

[@FrenchCrow]

I remember the Concorde and its Rolls-Royce/Snecma Olympus 593s with afterburners. I can tell it was interesting to see the take-off from the side of the runway :o)

[@shelingburga4796]

The most beautiful engine that I have seen and listened; It is song for My ears :)

[@seq165432]

Like that old Depeche Mode tune - Everything counts in large amounts.

[@davidsteer8142]

Hi Jay. What kind life do they have in 'generator/pump ' config? I have a fair amount of knowledge about engine life on wing, but the cycles are what kills them in aircraft. Also as a generator/ pump, are they run at a de rated figure or are they run at max continuous to get the most power?

[@FrontSideBus]

I love the noise it makes when it spools up!

[@Mark_Ocain]

Naked? I watched this in a 'gimp suit' complete with ball gag LOL. Seriously though, the Olympus has a sound all it's own and the core on those things is rock solid. No wonder bits of it would up as part of the power plant for the Concorde.

[@DScottDuncan]

Hear/notice/learn something new every time! Nice revisit of the ol' Britt!! Thanks again. DD

[@CanadairCL44]

All I can say is "Magnificent!" What a great engine from Rolls Royce. I would love to work for them on the production side but I have an aversion to redundancy!

[@BeachBow]

Great video! Loved it, screaming sound, blowing rocks and all!

[@TuffBurnOutTeam]

You do fantastic videos I been learning a lot of stuff and interesting Australia

[@Steve211Ucdhihifvshi]

oh man that sound! ive seen a couple of similar model turbines in peaking stations around the country, just not the same as an olympus

[@tomhappyster]

Thank you for your selfless teaching

[@ThomasHaberkorn]

Could you show where aircraft engines are connected to the aircraft frame, and what type these connections are? Thanks, love your videos!

[@Squat5000]

The first video I have seen where you started it with the skid steer. :-P Used to seeing the start cart!

[@killman369547]

music to my ears

[@ToothyGus]

It is too mouch

[@patrik8553]

4:04 i love that sound.. :D

[@ssgpentland8241]

so, how much LP does it consume on a run like this? I know the liquid fueled engines burn 20 gallons a min at full power (or close to that)

[@TheBLAKKROZE]

I could be laying in bed with my wife, but I wasn't tired so I am binge watching these videos

[@vlakynaslovenskuacesku7512]

Its beauty jet engine. I like it!

[@robertvorster8933]

A few questions if I may. 1) After rebuilds or refurbs how many test runs do you guys do to determine whether the engine is ready for service? 2) How long do you generally run the engines for during such tests? 3) In situations where the engines are not under load (Power turbines) how are they tested differently since you are not running load? 4) Do you have any test stand rigging videos? (the before, during and after type, from nothing to on the stand, back to nothing, engine crated and ready to go. I know it sounds boring, and it takes time, but I think seeing some of the finer intricacies about assembly and rigging is actually interesting.)

[@AgentJayZ]

- As many as we need to, no more - Usually about a half hour - Engines have an exhaust nozzle, gas generators don't, so we put one on. Your incorrect terminology led to the confusion. - The crew rigging the engine does not want me filming their activities. I have videos about our engine test stand.

[@billwest1945]

Saw a video of a tornado blowing grass just like that...serious stuff!

[@redroostermcmlxxl]

Great job on the engine fellas.

[@The-Vay-AADS]

i love how the rumble just completely wastes the camera's cheap mic, ahahahahaa, pure distortion. not dissing the camera, no camera without a special mic is designed for such work but still, ahahaha :-D

[@billybellend1155]

It’s not a Rolls-Royce engine it was designed and built by Bristol Aero Engines as the Bristol B.E.10 Olympus. Rolls-Royce bought out Bristol but this engine dates back to 1946.

[@AgentJayZ]

+Gavin Sharp It has a data plate that says Rolls Royce Olympus... What should I call it?

[@Deltacon84]

Both correct it is Rolls made item but the design of historical interest is indeed the original Type Bristol Siddeley Olympus early smaller type similar as those fitted to early smaller Vulcan B1 aircraft. They have a distinct almost air raid siren kind of harmonic whine. I love it. These vids are superb !

[@keithglaysher9201]

A magnificent beast!

[@iainbagnall4825]

My only question is; what for an why does this test rig/stand exist? Why are you restoring/rebuilding these amazing engines? Static generators?!

[@conkerconk3]

for some reason when i hear of a rolls royce jet engine, i image the intake fan blades to be made out of polished chrome and a golden casing. but tbh it's impressive how the company can go from making really luxurious cars to building highly efficient jet engines.

[@AgentJayZ]

Rolls Royce aero engines and RR motor cars separated ways and became completely independent of each other decades ago. They have nothing in common but the name... strangely.

[@CanadairCL44]

@@AgentJayZ Rolls Royce cars are now made in Germany by BMW. There was no way the UK government was going to allow The engine division to be sold off! In fact Rolls Royce now have serious in many US aero engine manufacturers,like Allison, and P&W.

[@classekaka]

You mentioned the difficulties to get spare parts. Is RR still producing parts or how else did finally you got what you needed? Is there even such a thing as 3rd party suppliers in the jet industry?

[@TheGuy-xk9sf]

Insane spoolup sound

[@poly_hexamethyl]

If this engine is meant to drive a generator, I'd expect its design was optimized to put as much power as possible into the turning shaft, rather than exhaust thrust? 9:44 Yet it still produces quite a lot of wind. Wow!

[@eugeneoreilly9356]

The problem with the Olympus is that it was initially designed as a turbojet for aircraft and was later used in marine and industrial applications so it not ideal.The equivalent offering from RR in that size and power bracket was the Conway which was a turbofan with very low bypass ratio.The Olympus has zero,it's got no bypass.

[@jpatt1000]

Do you know which plant your Generac unit came from? If it's from the Oshkosh plant I may have tested it! I like the smell of jet exhaust. What does one smell like running on propane? I would imagine you'd smell almost nothing.

[@DinoAlberini]

Awesome! Can the compressor stator blades (the first ones behind the struts, I can't really see well the others) be trimmed?

[@1hdsquad]

That engine is like the rolls royce of turbine engines! Okay okay, 5 bucks into the bad pun piggy bank...

[@christianmygind2358]

I know that you do not work with turbofans or props, but i would like to ask you a question anyway; Would there be any profit in ading a counter rotating fan on a turbine fan engine, so that there would be to fans in counter rotating motion instead of one?

[@EmileEichenberger]

Thank you for another great video. I just wondered: when the engine is run using gas instead of kero, I assume you would need a different fuel pump and injectors. Could you explain the difference between the two?

[@jharrison5464]

whilst these olympus engines are power units does that mean your team know what is required to do a similar job on an aircraft mounted olympus?

[@BillyNoMates1974]

great video. Are there some implications with a reconditioned engine (shorter oil change interval, dont run such high rpm for the first 100 hours etc)? For example, with a reconditioned car engine the engine has to be run in again and a shorter oil change interval

[@AgentJayZ]

Overhauled is functionally new, so no restrictions on the normal operation.

[@Timmernator9]

if you overhaul an engine, what (important) parts should remain, in order to call it an overhauled engine rather than a new engine? Greetings from The Netherlands!

[@chriswasson6757]

Hi Jay, Just wanted to piggy back a comment I saw in this thread about the direction of spin of the compressor and turbine. Have you come across any that rotate in the opposite direction? Also, that's quite a large rotating mass, do you know if aircraft have to be designed in some way lopsided to counteract the centripetal force of that spinning mass? Cheers as always, Chris.

[@LLSeltzer]

Propane! Jet A is the norm, but how is Propane? Is there any power output difference using Propane? I would imagine that the fuel nozzles are different and that the exhaust output is cleaner than when using Jet A.

[@AgentJayZ]

Different fuel nozzles. Shown in my vids about fuel nozzles. Power is determined by heat. However you make that heat does not matter. Exhaust has no soot on propane or natural gas.

[@jimmysparks315]

Great video....did you mentioned that this engine is used for producing electricity ? If so, does it drive some kind of output shaft ?

[@AgentJayZ]

Yes, through the use of a power turbine placed in the exhaust stream. Have a look at my videos on power turbines.

[@CanadairCL44]

@@AgentJayZ They have two of these in my local hospital (Addenbrookes) here in Cambridge UK, generating power for the hospital, AND for the surrounding residential properties. Amazing engines!

[@mrbat0003]

Why is the CONCORD faster than the average planes of today? Is it because concord has bigger engines or is it the same engines just designed differently?

[@motormouser]

The engines in the Vulcan over here are near the end of their hours,what would be involved (If it's at all feasable) to zero hour them?

[@Phoenix-ej2sh]

Gods, I love the sound of an Olympus starting up and running. This is one of your best videos, Jay. I love the different shots you brought into this one.

[@knet1973]

I know you allways keep a safe distance from the intake of a running engine, but I'm curious about the nature of the beast. Can you ever feel the sucking of the engine without getting too close, or is nothing, then nothing, then nothing, then you're suddenly just sucked in if you would, hypothetically, walk too close? Btw, what's the safety distance?

[@AgentJayZ]

Well, the best guy to ask woulda been Ron... but we lost him last month...

[@Coolkeys2009]

AgentJayZ I'm curious about the safe distance behind the engine looking at that torn up ground. I still find it impossible to visualize how much energy is in the air leaving the engine.

[@AgentJayZ]

Coolkeys2009 The safe distance behind an Olympus at full power at our test cell is outside the known universe. Nobody has even thought about trying it. At 100m, the air won't knock you over, but the gravel will be hitting you like bullets. Enough to penetrate your body and hurt you seriously? Nobody has bothered to find out.

[@stevenhoman2253]

Was gonna ask 're Concorde. Ta mate. 30MW Or 30000MW? Does it only differ from the Concorde engine due to the deletion of afterburners? Boy, the earth is still moving. I wish.I was there.

[@eugeneoreilly9356]

No engine produced can make 30,000MW.Thats 50pc off total UK grid power.

[@stevenhoman2253]

Boring is good, real good. This isn't trying on sunglasses😂👌👍👏👏👏

[@SquillyMon]

As I watch in amazement...trying to imagine how far behind this engine the high speed air actually goes. I wondered...does running a power plant like this in a stationary position over stress its mounting points? Does it hurt itself by being prevented from moving as it would in an aircraft? Does this make any sense?

[@AgentJayZ]

It puts the same force through its mounts as it would in an aircraft. Industrial mounts don't need to worry about weight, so they are far stronger, usually.

[@SquillyMon]

AgentJayZ Excellent... Thank you...Seemed a good question, no ?

[@80AFT]

Hi Jay..Question: Can you tell us how much it costs to service or overhaul a jet engine? I guess some are more expensive than others depending on damage or wear..

[@AgentJayZ]

exactly...

[@Theutmostgeek]

In terms of time starting up before fuel is introduced, are hydraulic starters quicker then regular air starters?

[@AgentJayZ]

What's a regular air starter? For aircraft, it's all about weight. A hydraulic starter can be powerful and inexpensive, but then it will be heavy. Air starters are powerful and lightweight, but are very expensive. For industrial gas generators based on aviation engines... aeroderivative as it is called, like this Olympus, sometimes it's easiest to just use the aircraft starting system... which in this case was a small, highly stressed hydraulic motor. So in this video, we have an industrial gas generator, based on the design of an aircraft engine, using the aircraft starting system, which is a small hydraulic motor that would be considered undersized by industrial hydraulic standards, and needs a lot of expensive maintenance. A true industrial hydraulic starter motor for this engine would be rock solid reliable, and weigh more then ten times as much. So, for this industrial powerplant, why not use that? Well, redesigning and re-engineering anything is very expensive.

[@Theutmostgeek]

@@AgentJayZ ah that makes sense. Also, my mistake for mixing the names up. I meant to type starting from a start cart rather then "regular air starter".

[@thestormyc268]

i have loved all of them

[@nonoaidnono]

I just watched an old video where the start cart spat fire when it started, that thing looked prehistoric

[@lutfijd]

Quick question about turbofans. whats the diameter of the fan in a turbo fan, also whats the diameter of the compressor inlet behind the fan? I tried to look up the numbers on the internet but no luck. I dont care which turbofan it is im just curious. Thanks.

[@AgentJayZ]

Turbofans power the cruise missile, and the 777. Those are high bypass ratio. The f-14,15,16, 18, 22, and 35 use what are called low bypass ratio turbofans. Pick a diameter, and a bypass ratio, and use some basic geometry. The bypass ratio of a JT8-D is about 1:1. The bypass ratio of a GE 90 is about 8:1 I think the diameter of the GE 90 is about 110 inches. Work your arithmetic, and get your results. Also, if you google the word turbofan, there are many excellent illustrations that will show you the relationship between fan and core diameter. Cheers!

[@LarryTipton]

I'm an instructor for Fisher Controls. I couldn't help but notice the C1 Pressure Controller on the wall of the fuel shed. Do you use that to automatically control the fuel pressure? Working well, I hope...

[@AgentJayZ]

Larry Tipton Yes. You'll have to ask Byron about the details, because he and Electron Bill designed and build the fuel shack. But I'm sure you know exactly how the thing works.

[@corrodesthefilm]

How long does this motor take to spin down from fuel cut to 0RPM N1. For that matter does N1 or N2 come to a stop first? N2 is going faster but I imagine N1 has a lot more mass...

[@AgentJayZ]

Good question ! You can hear Mike say near the end of this video, that they are looking for at least 3 min until the LP stops, and this engine far exceeds that. The HP will stop quicker, because it is driving the oil pumps, but then there is no way to see when it actually stops.

[@paul74656]

A beast of an engine

[@AgentJayZ]

paul taylor Just Guessing, but you may want to check out my test vids of the RR Avon.

[@krbruner]

When starting a 2 spool engine, I understand that the HP spool has a required RPM for startup, but does the LP spool also have a required RPM. I am assuming not, since the LP is driven by the HP at power, but that does not mean that the LP does not still have to be spinning at a specific RPM to have a safe startup. Are there ever accessories attached to the LP, that would require a specific RPM to start. Also, the guy in the fuel booth, is he just controlling fuel heating and delivery to the cell? Throttling of the engine is still controlled by the guy in the test cell, right?

[@AgentJayZ]

We care about the HP for startup. The LP can do whatever it wants. I don't know of any accessories being driven by the LP, except speed measurement devices. Byron controls the supply of the fuel, and he's the guy that shuts the engine down.

[@tymo7777]

I noticed one of the guys on site had a KC Royals hat on! Any connections to KC. Thanks for the videos from Kansas by the way. Go Royals

[@rozanoff6175]

Did you make some modifications concerning the fuel nozzles to be adapted to the gaseous propane ?

[@AgentJayZ]

The entire fuel system is different.

[@alancaraway6023]

Jay, you may have answered this in an earlier posting, so apologies in advance. During starting sequence, when the ignitors are energized, is there an engine specific duration that they fire? Great videos thanks!

[@AgentJayZ]

Alan Caraway I'm going to put this answer in Q38... because it is a bit of a long answer...

[@amgvrn]

Such a shiny engine! :) I always thought, that big "nose" in front of majority of engines is a fairing for electric starter and his couplings. Is this wrong for a bigger engines? Or it depends on what environment engine will be working in?

[@AgentJayZ]

The fairing needs to be there for aerodynamic reasons. Sometimes it contains a starter and in many engines the starter is placed somewhere else in the design.

[@nadavbloch7308]

For which use are these engines used for with all thenice auxiliary facilities around it?

[@notlob231]

When they started the Concorde engines believe they had to run slowly or the shafts would oscillate before the engine had warmed up due to them being long and the engine not to being to temperature/ critical dimension!. Is this right and do you have to do the same thing for the generator version?

[@AgentJayZ]

Run slowly? What does that mean? We've covered the issue of heat and cooling air. The two points on the rpm range where a turbine engine runs hottest is at the max power limit, and when it's idling. During startup it goes even hotter, and this is considered an allowable temp spike. Running the engine slower is harder on it, not easier. Also, the engine parts "warm up" in less than a minute, while the oil takes five or so... Also... Oscillate in what way? Axially... No Radially? That would imply the shafts are "loose" in the bearings until they expand to fit as they heat up. This is not so. The shafts also do not "whip", as they are not wet noodles, but immensely rigid, precisely machined, heavy pieces of high alloy steel, It appears to me that your source is lacking

[@notlob231]

AgentJayZ Doooerr ! I shall have to get my Concorde book out. Thanks for your reply. Am enjoying your strip down of the AI 25. DD

[@notlob231]

Deezil Dave Normal 0 Hi Agent J Kay. Regarding my previous comment on the Olympus 593 …quoting from Brian Trubshaws’ (Concorde Test pilot) book ‘Concorde - The Inside Story’......‘The first of these (problems) was the ‘propensity to break shafts’. This phenomenom was due to a temperature difference between top and bottom during cooling after engine shutdown. On engine restart the out of balance shaft could break. Consequently, a procedure known as ‘de-bowing’ was introduced for several years until an extra bearing was introduced ’. Obviously this doesn’t apply to your lovely Olympus, but it highlights an interesting stage in development. Keep making your videos! They are brilliant !!

[@notlob231]

AgentJayZ Think Google has Mullered my reply a bit see my read more below

[@handsomeDevil548]

Oh, we need to full spool up!!!!

[@jcims]

I don't know how many of your videos I've watched, but it's a lot. I absolutely loved this one, little bit of plant, lots of great angles on that beautiful engine, amazing sounds and a nice perspective on the environmental effects of a 30k+ hp air cannon. Do your ears pop when you open the door to the control room during a test?

[@AgentJayZ]

Ear protection is worn everywhere in the test cell, even in the control room, for that very reason

[@patrik8553]

Nice fan for my computer ! :D

[@PaPWPW]

Great video! If you don't mind me asking a unrelated question: How do turbines make electricity? through the engine shaft linked to a generator? Thank you

[@popcorn32145]

how much does one of these engines cost?

[@jim5870]

why the generator? Is the test stand building not hooked up to the grid? or do you use it because you dont want to lose control of the engine's controls and sensors if there is a power failure?

[@AgentJayZ]

our test cell is in the exact middle of nowhere. no water, no power, no nothin'

[@sdavies45]

AgentJayZ Is it correct to say that if there was a power failure the fuel supply to the gg would be shut off automatically anyway?

[@AgentJayZ]

Ever heard of a UPS? They come in Large, too.

[@jcims]

AgentJayZ and no neighbors, lol

[@skmetal7]

How fast is that "wind" moving out of the back of that engine? 100 mph? 150mph? 500,000mph?

[@AgentJayZ]

+skmetal7 This is an industrial engine, so it does not have an aircraft jet nozzle to maximize the speed of the exhaust gases, but the tail cone we use to calculate power is similar. At full power the "wind" is leaving the engine at supersonic speeds, and slows down to about 100mph or so within 100 yards or so. I say or so because it's not something we measure.

[@knet1973]

I assume you all think jet noise is music to you ears, but do you think you risk hearing damage in your job? Like, does your head ring after a test is over?

[@AgentJayZ]

Assume all that you want. Funny thing... I can't hear you... My earplugs work so well they block out all annoyances. Thank you for assuming it's even possible to be around such things without ear protection... It shows how little you actually know. I will proceed with the same amount of respect for your intelligence and judgement: STFU, and FTFO. Twice.

[@sdavies45]

AgentJayZ I don't think this poster intended to be annoying, I think they were just asking if you felt likely to suffer from hearing damage. Myself, I am well aware of the danger of loud noise and I know that your ears would be obliterated by that dangerous noise. I notice you all wear ear protection. I would also like to say that I enjoy watching all of your videos and I would like to request more test vids if possible. I hope everything is ok. Stuart

[@AgentJayZ]

sdavies45 Thank you for your gracious opinion regarding the intentions of another commenter. I don't agree with it. As far as your request, I record every engine test we do, and I've posted all of them. You want more ? Can't help you there...

[@sdavies45]

I enjoy your videos and I always eagerly but patiently wait for the next test. If you post all of your engine tests, then that is all I was asking for, however I realise that yoiu are probably very busy in the shop. I could also be wrong about the intentions of the other commenter

[@jimmysparks315]

If these are powering up a hospital, what kind of silencers (if any) would you use ?

[@AgentJayZ]

I have seen a gas turbine engine larger and more powerful than this (LM6000) used for generating electricity at an installation that was quiet enough to hear birds chirping right next to the building. Both the inlet and exhaust silencers looked like 5-storey office buildings.

[@pyrexian26]

what is the coating on the inlet guide vanes? it looks really cool

[@greghelms4458]

Do you supply oil pressure to the bearings on engine spool down or rely on residual oil for proper lubrication?

[@AgentJayZ]

The oil pump is connected by gears to the main rotor, so if the rotor is turning, oil is circulating.

[@greghelms4458]

Sweet. That should have been intuitive on my part.

[@Jangle2007]

Beautiful machine. And great video. But I'm confused about one thing: in this video the engine is clearly putting out a lot of thrust, whereas I thought in its electricity producing mode, the turbine would be used to generate electricity and therefore produce negligable or zero thrust. For the test here in the video, did you install the jet pipe to produce thrust as a way of simulating load? Thanks for great videos and great information.

[@AgentJayZ]

Really good question. Yes, the tail cone we use provides the load, but is of a larger area than the aircraft jet nozzle, so it produces less thrust.

[@simonwatts8338]

My Brother used to work on Olympus engines in a power station. They were used to quick start the generator turbines before the live steam from the boilers got up to pressure. This was so they could virtually instantly provide excess electricity during sudden peak demands, half time during the FA cup final being a good example, when everybody rushes out to make tea & coffee and puts millions of electric kettles on.

[@simonwatts8338]

Oh, the engines were used as gas generators, the exhaust turning the electric generator turbines.

[@FlowersForYou629]

How hot is the exhaust from this engine? I don't know of any particular engine to specify so I ask about this one. Also, what is the two probe looking rods mounted on the exhaust tube. (you went in for a close up on the "probes")

[@AgentJayZ]

tylercampbell92 Exhaust temp is called EGT and is displayed on the monitor screen. The probes in the test jet pipe are for measuring total pressure in the exhaust, which we use to calculate power produced.

[@Rovertsmasher]

Really cool engine, i'm a fan of the Avro Vulcan. I have a question: have you ever accidently stepped into the jet wash or put the camera too close to where its going to be?

[@AgentJayZ]

Never accidentally. Not at power. I have a video of Massih walking into an Olympus exhaust stream at idle power. "Man vs jet exhaust", I think. One of my cameras took a short flight courtesy of a J79 in afterburner.

[@gmonkeyboy10]

What are all of those light clinking noises as it reaches at very low speed when spinning down?

[@evanchi9460]

Those are the compressor blades clacking around. The blades aren't locked into their, 'Holder' very tightly, there's a bit of give. At the lower RPM's when they're not clacking around due to centrifugal force, you hear that.