United4EverDEN From , joined Dec 1969, posts, RR: Posted (11 years 5 months 3 weeks 4 days 3 hours ago) and read 4381 times:
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?
A10warthog From United States of America, joined Jul 2004, 329 posts, RR: 0
Reply 1, posted (11 years 5 months 3 weeks 4 days 2 hours ago) and read 4333 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
BlueF9A320 From United Kingdom, joined Oct 2004, 90 posts, RR: 0
Reply 2, posted (11 years 5 months 3 weeks 4 days 2 hours ago) and read 4328 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.
FBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 4, posted (11 years 5 months 3 weeks 4 days ago) and read 4266 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.
Dl757Md From United States of America, joined May 2004, 1564 posts, RR: 15
Reply 7, posted (11 years 5 months 3 weeks 3 days 14 hours ago) and read 4059 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.
Lufthansa From Christmas Island, joined May 1999, 3282 posts, RR: 9
Reply 9, posted (11 years 5 months 3 weeks 3 days 5 hours ago) and read 3901 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!