Search found 247 matches

by grandtheftaero
Thu Jan 08, 2004 11:14 am
Forum: Technical/Operations
Topic: Cones On Jet Engines?
Replies: 22
Views: 15734

RE: Cones On Jet Engines?

<i>"Lack of fact-checking is what makes A.net a breeding ground of rumors..."</i> Amen, brother. <i>"I wish I had the equipment and knowledge to send you a color cross-section of a high bypass jet engine illustrating the internal airflows - it's pretty amazing."</i> Indeed they are amazing. Here's a...

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by grandtheftaero
Tue Jan 06, 2004 12:44 pm
Forum: Civil Aviation
Topic: Nicest Engine Roar
Replies: 51
Views: 4055

RE: Nicest Engine Roar

DAirbus,

The TF39 is the predecessor of the CF6, not exactly the militarized version. Its distinctive roar is caused by the 1.5 stage fan arrangement. The CF6 is much quieter, having a more modern single-stage fan. But you're right about the TF39 having a kick-ass sound!

--Shane

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by grandtheftaero
Mon Jan 05, 2004 9:42 am
Forum: Technical/Operations
Topic: Cones On Jet Engines?
Replies: 22
Views: 15734

RE: Cones On Jet Engines?

Sweet pic, Bruce! It's the perfect illustration for my previous post.

--Shane

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by grandtheftaero
Mon Jan 05, 2004 9:29 am
Forum: Civil Aviation
Topic: Hypersonic Travel
Replies: 21
Views: 3202

RE: Hypersonic Travel

<i>"No. Will never be feasible."</i> Just like the horseless carriage and the computer that could fit into one room. <i>"Maybe if research started now into liquid hydrogen propulsion there might be a prospect."</i> The scramjets and pulse-detonation engines that are under research right now are all ...

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by grandtheftaero
Sun Jan 04, 2004 10:43 am
Forum: Technical/Operations
Topic: Cones On Jet Engines?
Replies: 22
Views: 15734

RE: Cones On Jet Engines?

As others have mentioned, all engines have aft cones. Some are just hidden inside the nacelles. The cones provide a flowpath for the air that is exhausting the core of the engine. The exit of the engine core has an annular cross-section. If left to its own devices the exhaust flow would recirculate ...

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by grandtheftaero
Mon Dec 29, 2003 4:17 am
Forum: Site Related
Topic: Threads Taking A Long Time To Open
Replies: 72
Views: 4855

RE: Threads Taking A Long Time To Open

I'm not signing up for AOL no matter how slow this gets  Laugh out loud

I hope they get it fixed up soon.

--Shane

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by grandtheftaero
Sun Dec 28, 2003 5:29 pm
Forum: Technical/Operations
Topic: The GE-90
Replies: 33
Views: 10873

RE: The GE-90

Mr.BA,

Thrust reversers are located on the nacelle. I believe T/R deployment is pretty much independent of engine size. I don't think it would take any longer to deploy T/R on a GE90 than any other engine.

--Shane

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by grandtheftaero
Sat Dec 27, 2003 5:17 am
Forum: Civil Aviation
Topic: New 744 Cabin -?preview Of 7E7s?
Replies: 7
Views: 4263

RE: New 744 Cabin -?preview Of 7E7s?

More info and bigger photo here: http://www.boeing.com/news/frontiers/archive/2003/april/i_ca2.html

I like it, too. Good to see that airframers are putting due effort into interior design.

--Shane

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by grandtheftaero
Thu Dec 25, 2003 4:24 pm
Forum: Technical/Operations
Topic: Aeronautical Pet Peeves
Replies: 34
Views: 4424

RE: Aeronautical Pet Peeves

Pilots who put in an Avgas request to "top it off" when they really meant "to the tabs" then get all pissy when see a completely full tank of gas!

--Shane

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by grandtheftaero
Wed Dec 24, 2003 2:22 am
Forum: Technical/Operations
Topic: That 737-900 Sound
Replies: 10
Views: 5360

RE: That 737-900 Sound

I believe the sound you are talking about is called buzzsaw noise. It is the sound of shockwaves caused by the fan blades in the engine. Each blade causes it own shockwave as it travels through its arc. The effect of successive shockwaves sounds like a loud buzz. You usually only hear it at take-off...

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by grandtheftaero
Tue Dec 23, 2003 12:46 pm
Forum: Site Related
Topic: Capitalization In Username Field
Replies: 4
Views: 659

RE: Capitalization In Username Field

NICE... it worked!!! Thanks, SONIC!!!

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by grandtheftaero
Tue Dec 23, 2003 12:46 pm
Forum: Site Related
Topic: Capitalization In Username Field
Replies: 4
Views: 659

RE: Capitalization In Username Field

Sounds reasonable to me. I'll give it a try.

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by grandtheftaero
Tue Dec 23, 2003 4:24 am
Forum: Site Related
Topic: Capitalization In Username Field
Replies: 4
Views: 659

Capitalization In Username Field

Hi all: When I post to a forum from my home computer the Username field defaults to "grandtheftaero" (all lower case). When I post using the computer at work it defaults at "GrandTheftAero" (the capitalization scheme I prefer). At home I have to manually change the "g...t...a" to "G...T...A". What's...

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by grandtheftaero
Tue Dec 23, 2003 1:26 am
Forum: Civil Aviation
Topic: Where Did Douglas Corp/McDonnell Douglas Go Wrong?
Replies: 14
Views: 4482

RE: Where Did Douglas Corp/McDonnell Douglas Go Wrong?

Wow... this is all new to me! Are these explanations based on facts or opinions? Every piece of literature I have read, documentary I have seen, and conversation I have had with ex-MD employees placed <acronym title="Air Madagascar">MD</acronym>'s demise solely on the loss of the Joint Strike Fighte...

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by grandtheftaero
Mon Dec 22, 2003 4:10 pm
Forum: Civil Aviation
Topic: Three Holer Engines
Replies: 7
Views: 1849

RE: Three Holer Engines

On the DC-10 (and I assume <acronym title="Air Madagascar">MD</acronym>-11 as well) the tail engine is the same as the other two. The only difference is that some of the bleed air plumbing is routed differently. VS340, can you explain how the tail engine looks different than the other two? Perhaps y...

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by grandtheftaero
Mon Dec 22, 2003 1:24 pm
Forum: Civil Aviation
Topic: "Area 51 Airlines" Reniewing The Fleet?
Replies: 9
Views: 4467

RE: "Area 51 Airlines" Reniewing The Fleet?

<i>"The name of the airline is <acronym title="Japan Asia Airways">EG</acronym>&G..... What does it stand for?"</i> Actually <acronym title="Japan Asia Airways">EG</acronym>&G is the name of the contractor that operates the airline. It's the initials of the last names of the company's founders: Haro...

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by grandtheftaero
Mon Dec 22, 2003 11:36 am
Forum: Technical/Operations
Topic: Starting An Engine In-Flight
Replies: 9
Views: 12752

RE: Starting An Engine In-Flight

Yes, jet engines can be started in-flight. One of the major test points for a new-development engine is an in-flight start up. Usually if an engine experiences an in-flight shut down it is taken off wing when the plane lands and is serviced ASAP so the question of remain hours is somewhat moot. I gu...

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by grandtheftaero
Wed Dec 17, 2003 2:02 pm
Forum: Civil Aviation
Topic: Honda's New Business Jet
Replies: 18
Views: 5411

RE: Honda's New Business Jet

Captaingomes, Indeed... Honda does make engines for many different applications. But according to their website they are all reciprocating (with the exception of their turbofan). And unless Honda ever built steam engines or Sterling cycle engines, they are also all most definitely internal combustio...

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by grandtheftaero
Wed Dec 17, 2003 1:45 pm
Forum: Civil Aviation
Topic: Honda's New Business Jet
Replies: 18
Views: 5411

RE: Honda's New Business Jet

<i>"I'd be more impressed if they were designing the engines, since they are the largest engine manufacturer in the world. Why are they getting into airframe design?"</i> Jet engines are actually <u>nothing</u> like reciprocating engines used in automobiles. Starting from scratch I think Honda would...

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by grandtheftaero
Tue Dec 16, 2003 1:21 am
Forum: Technical/Operations
Topic: Three Spools... Why?
Replies: 4
Views: 3346

RE: Three Spools... Why?

Thanks, guys! Great explainations.

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by grandtheftaero
Tue Dec 16, 2003 1:11 am
Forum: Civil Aviation
Topic: Boeing 808 Announcement "Expected"
Replies: 73
Views: 23496

RE: Boeing 808 Announcement "Expected"

<i>"I'd guess it'd have to be close to the 777's tag, given all the new engine..."</i> Actually, only Pratt & Whitney is designing a new centerline engine. <acronym title="Trans Asia Airways (Taiwan)">GE</acronym> is designing an engine based on the GE90 core. Rolls Royce is designing one around the...

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by grandtheftaero
Mon Dec 15, 2003 3:45 pm
Forum: Technical/Operations
Topic: Three Spools... Why?
Replies: 4
Views: 3346

RE: Three Spools... Why?

Hmm... I could have sworn that thread was in the Civil Aviation forum... could they have moved it to this forum? Looks like they also removed the last couple of posts where the discussion turned into a kindergarten. I could also just be mental. In any case... any know about those spools?

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by grandtheftaero
Mon Dec 15, 2003 2:09 pm
Forum: Technical/Operations
Topic: Three Spools... Why?
Replies: 4
Views: 3346

Three Spools... Why?

In the Civil Aviation forum there is a thread entitled "Trent900 Verses GP7200". It started off interesting but it has broken down into childish name-calling. It did spark a question in my mind though. If I am not mistaken, Roll-Royce uses an intermediate pressure (IP) spool in their Trent engines (...

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by grandtheftaero
Mon Dec 15, 2003 7:40 am
Forum: Civil Aviation
Topic: Boeing 808 Announcement "Expected"
Replies: 73
Views: 23496

RE: Boeing 808 Announcement "Expected"

Geez, this is one harsh thread. Lotta 7E7-haters here. Might I remind you all that in your first aerodynamics class they taught that worst speed regime to fly in was right below Mach 1, i.e. the speed where the Sonic Cruiser was to cruise. <acronym title="Shandong Airlines (China)">SC</acronym> was ...

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by grandtheftaero
Mon Dec 15, 2003 7:21 am
Forum: Civil Aviation
Topic: Boeing 808 Announcement "Expected"
Replies: 73
Views: 23496

RE: Boeing 808 Announcement "Expected"

<i>"Ugh, as much as people say the 7E7 is something "new"...its still going to be a typical looking plane"</i> Many are correct in saying that the 7E7 looks like any other tube with wings (plus maybe a shark fin for the vertical stab). But before you pass judgment I would ask that you take a look at...

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by grandtheftaero
Sat Dec 13, 2003 12:17 pm
Forum: Technical/Operations
Topic: AA Flight 191 Crash
Replies: 31
Views: 8810

RE: AA Flight 191 Crash

OPNLguy, Thanks for the info. I'm familiar with this accident and I suspected that it had something to do with aft attachment hardware separating before the forward attachment hardware. I should point out that the website I pasted into my first message was not the first place that I read/heard of th...

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by grandtheftaero
Sat Dec 13, 2003 9:45 am
Forum: Technical/Operations
Topic: AA Flight 191 Crash
Replies: 31
Views: 8810

AA Flight 191 Crash

Hello All: Here's a link to an article about the <acronym title="American Airlines (USA)">AA</acronym> 191 crash if you are unfamiliar: <a href="http://www.airdisaster.com/special/special-aa191.shtml">http://www.airdisaster.com/special/special-aa191.shtml</a> Reports say that when the engine disconn...

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by grandtheftaero
Sat Dec 13, 2003 9:08 am
Forum: Civil Aviation
Topic: Where's Our College Aviation Buffs!
Replies: 63
Views: 4101

RE: Where's Our College Aviation Buffs!

Hey all: I'm a senior at Cal Poly Pomona (Go Broncos!) studying Aerospace Engineering. I also work at <acronym title="Trans Asia Airways (Taiwan)">GE</acronym> Aircraft Engines located at <acronym title="Ontario - International (ONT / KONT), USA - California">ONT</acronym> where we do CF6 overhaul. ...

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by grandtheftaero
Thu Dec 11, 2003 9:39 pm
Forum: Technical/Operations
Topic: Afterburners On A Citation?
Replies: 13
Views: 3870

RE: Afterburners On A Citation?

Lehpron: I think you're right about the shape. According to Cessna's website the airspeed limit for the Citation X is Mach 0.92. Even if you did put afterburners on it (which would be cool as hell, BTW) you'd probably fly it to pieces before you reached Mach 1. --Shane P.S. While working at <acronym...

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by grandtheftaero
Thu Dec 11, 2003 9:08 pm
Forum: Technical/Operations
Topic: Drag, Which Area?
Replies: 10
Views: 2007

RE: Drag, Which Area?

<i>you cannot separate the definitions from the technical descriptions</i> Agreed. Believe it or not, I also appreciate being corrected when I slip up. Although after being corrected by the same guy twice in two days I was feeling a bit singled out. Silly of me, really... new-guy complex, I guess&nb...

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by grandtheftaero
Thu Dec 11, 2003 5:19 am
Forum: Technical/Operations
Topic: Drag, Which Area?
Replies: 10
Views: 2007

RE: Drag, Which Area?

Fred: Maybe you should be an English teacher instead of an aviation enthusiast. You seem like a smart guy but this is the second thread where you have nitpicked the semantics of my post  <img src="/discussions/graphics/angry.gif" ALT="Angry"> instead of constructively augmenting the technical c...

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by grandtheftaero
Wed Dec 10, 2003 6:08 pm
Forum: Technical/Operations
Topic: Drag, Which Area?
Replies: 10
Views: 2007

RE: Drag, Which Area?

<i>As the plane pitches up, the overall drag may get bigger</i> This is caused by induced drag. As the plane pitches up the lift vector tilts back. If you do a trigonometric break down of the lift vector, the horizontal component of lift creates drag. This is what is call induced drag, it is purely ...

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by grandtheftaero
Tue Dec 09, 2003 3:56 am
Forum: Technical/Operations
Topic: Explosive Bolts On 747 Engine Pylon
Replies: 11
Views: 21327

RE: Explosive Bolts On 747 Engine Pylon

Thanks, 747Teach, for the informative post. Like I said, I've never seen the bolts that attach the engine to the pylon but I have seen the pins in the mounts. Indeed, they are solid as a rock (a titanium rock, as it were).

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by grandtheftaero
Tue Dec 09, 2003 3:55 am
Forum: Technical/Operations
Topic: Aircraft Engine Testing - Birds
Replies: 16
Views: 14732

RE: Aircraft Engine Testing - Birds

Wingscrubber, you got it exactly right. If an engine is shut down in-flight, the air passing though the engine will make the rotors rotate... just like a windmill, thus the term "windmilling". Jet engines will also windmill while sitting on the ground just due to wind, as you may have seen at an air...

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by grandtheftaero
Tue Dec 09, 2003 3:31 am
Forum: Technical/Operations
Topic: 777 Wing Design.
Replies: 26
Views: 7668

RE: 777 Wing Design.

Touche, FredT... I should have said, "where the maximum camber is located near the trailing edge with most of the curvature at the bottom surface of the wing." Here is what I am talking about:<br> <center><img src="http://www.dfrc.nasa.gov/Newsroom/FactSheets/Popups/Images/FS-044-DFRC_popup2.jpg"></...

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by grandtheftaero
Mon Dec 08, 2003 3:30 pm
Forum: Technical/Operations
Topic: 777 Wing Design.
Replies: 26
Views: 7668

RE: 777 Wing Design.

<i>"The top is curved downwards, and that's the important part. The bottom of the wing, well, it's not nearly as important."</i> Actually most modern high-subsonic airliners have supercritical wings where most of the camber is located on the BOTTOM on the wing. Check out the "Supercritical Wings" th...

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by grandtheftaero
Mon Dec 08, 2003 1:59 pm
Forum: Technical/Operations
Topic: Supercritical Wing
Replies: 2
Views: 2705

RE: Supercritical Wing

In a nutshell, supercritical wings have nearly flat tops and most of their camber at the bottom part of the wing near the trailing edge. This moves the point where the flow becomes sonic toward the trailing edge of the wing. This is important because at this point along the wing chord a shockwave fo...

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by grandtheftaero
Mon Dec 08, 2003 10:42 am
Forum: Civil Aviation
Topic: Price List For Aircraft
Replies: 11
Views: 4507

RE: Price List For Aircraft

In our Senior Vehicle Design class in college we learned that airplanes are approximately paid for "by the pound". To prove this to ourselves we went to Boeing's price list and compared the cost of the plane to its MTOW (also available from Boeing's website) by using a least-squares regression line....

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by grandtheftaero
Mon Dec 08, 2003 4:05 am
Forum: Aviation Hobby
Topic: What Is Your Favorite Airline Model You Own
Replies: 42
Views: 26656

RE: What Is Your Favorite Airline Model You Own

I know this isn't an airline (actually it isn't even a real airplane!) but it has to be my all-time favorite scale model... Testors F-19 Stealth Fighter Testors designed a plastic model based on "expert" descriptions of what the F-117 Nighhawk would look like before the US<acronym title="Air France"...

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by grandtheftaero
Sun Dec 07, 2003 7:09 am
Forum: Technical/Operations
Topic: Explosive Bolts On 747 Engine Pylon
Replies: 11
Views: 21327

RE: Explosive Bolts On 747 Engine Pylon

Thanks, Air2gxs... shear pins sound much more sensible than explosive bolts.

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by grandtheftaero
Sun Dec 07, 2003 6:04 am
Forum: Technical/Operations
Topic: Tow Truck And B747-400
Replies: 21
Views: 13525

RE: Tow Truck And B747-400

FYI... weight is a very important charateristic of those tugs too. A large pick-up truck could probably tow something like a Gulfstream V but it wouldn't have enough weight to slow it down quickly, let alone stop it, after you got the <acronym title="Riga Airlines (Latvia)">GV</acronym> moving. When...

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by grandtheftaero
Sun Dec 07, 2003 5:51 am
Forum: Technical/Operations
Topic: Explosive Bolts On 747 Engine Pylon
Replies: 11
Views: 21327

Explosive Bolts On 747 Engine Pylon

A fellow aerospace engineer once told me that the bolts holding the engines to the pylon on the 747 were explosive. According to him, this was so the engines could be ditched in case they caused undue loading on the airframe. Being a CF6 engineer I found this to be quite odd because I had never hear...

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by grandtheftaero
Sun Dec 07, 2003 3:44 am
Forum: Civil Aviation
Topic: Concorde Was To Be Sunk!
Replies: 16
Views: 4342

RE: Concorde Was To Be Sunk!

WTF? Wouldn't that turn into a coral reef anyway... leaving nothing for future generations but a big crusty silhouette of the Concorde?

--Shane

[Edited 2003-12-06 19:46:01]

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by grandtheftaero
Sun Dec 07, 2003 3:28 am
Forum: Civil Aviation
Topic: Space Tourism, Point?
Replies: 20
Views: 2525

RE: Space Tourism, Point?

I think space tourism is inevitable, and quite honestly if I could afford it, I'd take a trip myself. What absolutely pisses me off is guys like Peter Diamandis and Burt Rutan who talk about their pie-in-the-sky plans of opening up the next new frontier to the people of Earth for $15,000 a ticket. P...

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by grandtheftaero
Sat Dec 06, 2003 2:37 pm
Forum: Civil Aviation
Topic: Recently Spotted Rare Aircraft
Replies: 31
Views: 5002

RE: Recently Spotted Rare Aircraft

AGM100, 747GE has four pylons just like any other 747 but the inboard left pylon is custom built for the test engine. Currently a CF34-10 occupies that position, before that it was a GE90-115B. <br><center><font color="#EEEEEE" size="1" face="ARIAL, Helvetica, Geneva"><a href="/open.file/458222/L/" ...

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by grandtheftaero
Sat Nov 29, 2003 2:07 pm
Forum: Technical/Operations
Topic: Is Aurora Real?
Replies: 14
Views: 8658

RE: Is Aurora Real?

Indeed... here is a link to some info about the GAO report (scroll to about half way down the page) complete with some slick references, too.

http://www.fas.org/irp/mystery/aurora.htm

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by grandtheftaero
Sat Nov 29, 2003 1:31 pm
Forum: Technical/Operations
Topic: JT8D Vanes: What For? (for Buck Futt)
Replies: 14
Views: 8098

RE: JT8D Vanes: What For? (for Buck Futt)

High-bypass turbofans (like the CF6) actually do have IGVs but they are not in front of the Fan. They are located before the Stage 1 Rotor in the High Pressure Compressor. In this application, their purpose is purely aerodynamic. They condition the flow of air from the Fan Booster for the Stage 1 HP...

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