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MD-80 Engine Question  
User currently offlineUnited4EverDEN From , joined Dec 1969, posts, RR:
Posted (9 years 10 months 4 weeks 1 day 21 hours ago) and read 3502 times:

Hello all,

Today I rode AA flight 1513 ORD-DEN, about my 6th flight on an MD-80. I was seated in row 28, in perfect view of the engine fan blades. We did the one engine taxi, and pulled onto the runway. I was really thinking, 'oh sh1t' as we spooled up to takeoff. It is pretty loud to begin with, so it was hard to hear it start up, but it obviously did.

So what good do the static fan blades have? Are these common on all MD-80s? All AA MD-80s?

Thanks,
Ryan

13 replies: All unread, jump to last
 
User currently offlineA10warthog From United States of America, joined Jul 2004, 325 posts, RR: 0
Reply 1, posted (9 years 10 months 4 weeks 1 day 21 hours ago) and read 3454 times:

The "static fan blade" are Inlet Guide Vanes that are used to straighten and guide the airflow into the first stage rotors. If I am not mistaken they are actually part of the case. The MD-80 have a turbojet engine (JT8D) on them. This engine is also on the 727 and 737-200 aircraft

User currently offlineBlueF9A320 From United Kingdom, joined Oct 2004, 89 posts, RR: 0
Reply 2, posted (9 years 10 months 4 weeks 1 day 21 hours ago) and read 3449 times:

Actually the JT8D family of engines is actually a low bypass turbofan engine. The bypass ratio is close to 1:1, hence the relatively small size of the engine compared to modern day high bypass turbofan engine.

v/r

BlueF9A320



Audentes Fortuna Juvat...
User currently offlineA10warthog From United States of America, joined Jul 2004, 325 posts, RR: 0
Reply 3, posted (9 years 10 months 4 weeks 1 day 20 hours ago) and read 3437 times:

That right, my bad. I just read that in one of my books.

User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 4, posted (9 years 10 months 4 weeks 1 day 18 hours ago) and read 3387 times:

Actually,the MD-80 engines are JT8D-2xx series,whereas the early DC-9's,all 727's and 737-100/200 used the smaller JT8D-7/9/11/15 engines.These were also fanjets but the ratio was only some 0.43 if my memory serves me right.


"Luck and superstition wins all the time"!
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 10 months 4 weeks 1 day 17 hours ago) and read 3368 times:

They are called stator vanes.

User currently offlineAa717driver From United States of America, joined Feb 2002, 1566 posts, RR: 13
Reply 6, posted (9 years 10 months 4 weeks 1 day 10 hours ago) and read 3241 times:

There is a 5 minute warmup period that must be observed so the engine had to be started prior to taking the runway.

The -217's parts have a tendency to travel in directions other than that which they were intended if you don't observe the warmup and cool down limits...  Wow! TC



FL450, M.85
User currently offlineDl757Md From United States of America, joined May 2004, 1562 posts, RR: 16
Reply 7, posted (9 years 10 months 4 weeks 1 day 9 hours ago) and read 3180 times:

They are called stator vanes.

Stator vanes are after each stage of compressor blades or the fan blades. They straigthen out the airflow that the preceding compressor section has swirled. Since they are behind the fan/compressor stages I think that what United4everDEN is referring to, are as A10warthog said, the IGVs, which are as he said, to straighten out the airflow entering the fan. Since they do not follow any fan/compressor section they are referred to as IGVs rather than stator vanes.

Dl757Md



757 Most beautiful airliner in the sky!
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 8, posted (9 years 10 months 4 weeks 1 day ago) and read 3037 times:

As a matter of fact, the ORIGINAL JT8D series engines (-1 thru -17) had not one, but TWO fans. One behind the other. If you look at a cutaway, you will see this feature.

JT8D-Basic


User currently offlineLufthansa From Christmas Island, joined May 1999, 3217 posts, RR: 10
Reply 9, posted (9 years 10 months 4 weeks 23 hours ago) and read 3022 times:

also the MD-80 JT8D-200 series engines have a much higher by-pass ratio than the original ones on the 727/737/DC-9 which is why they meet stage 3 (although only just!) still, i think its great. I love hearing an MD-80 take off, espectially in winter!

Thats what a real engine sounds like...not of this pussy wimpy CFM business.
Wings of a man!
ROAR!


User currently offlineTimz From United States of America, joined Sep 1999, 6839 posts, RR: 7
Reply 10, posted (9 years 10 months 4 weeks 4 hours ago) and read 2901 times:

"...JT8D-7/9/11/15 engines.These were also fanjets but the ratio was only some 0.43 if my memory serves me right."

If my memory serves, their ratio was around 1:1. A Jane's from the 70s or 80s would tell.


User currently offlineATA L1011 From United States of America, joined Feb 2001, 1384 posts, RR: 6
Reply 11, posted (9 years 10 months 4 weeks 4 hours ago) and read 2868 times:

I too love the sound of the MD80's Pratts but I love the way they sound during taxi and the transition sound from throttle up/down to taxi power.


Treat others as you expect to be treated!
User currently offlineSeptember11 From United States of America, joined May 2004, 3623 posts, RR: 21
Reply 12, posted (9 years 10 months 4 weeks 2 hours ago) and read 2812 times:

I like the feel of the roaring of a MD-80 engine! Take off and landing. Also power back, too.



Airliners.net of the Future
User currently offlineSilver1SWA From United States of America, joined Mar 2004, 4820 posts, RR: 26
Reply 13, posted (9 years 10 months 4 weeks 2 hours ago) and read 2800 times:
Support Airliners.net - become a First Class Member!

I too love the sound of the MD80's Pratts but I love the way they sound during taxi and the transition sound from throttle up/down to taxi power.

Ahh, yesss...music to my ears! Now THAT'S what a jet engine is supposed to sound like. I love that whine!

As much as I like 737s, I dislike the "hissing" nature of their sound.



ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
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