Why is the S-duct intake on the Tu-154 uniquely oblong?Are engines fed differently in reduced gravity aircraft?Are general relationships between MTOW and OEW valid for novel configurations?Where is the APU in the case of an S-duct (like the L-1011)?How do I estimate how much air flows through the intake due to engine suction?Why does intake of turbofan engine have angle of attack?How does a subsonic jet engine intake design ensure correct air intake?What is this F-18 Hornet “air intake” for?How much lift can be generated by the intake lip of a duct?What are the issues involved in converting a quadjet into a twinjet?Why was the Electra uniquely vulnerable to whirl-mode flutter?
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Why is the S-duct intake on the Tu-154 uniquely oblong?
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Why is the S-duct intake on the Tu-154 uniquely oblong?
Are engines fed differently in reduced gravity aircraft?Are general relationships between MTOW and OEW valid for novel configurations?Where is the APU in the case of an S-duct (like the L-1011)?How do I estimate how much air flows through the intake due to engine suction?Why does intake of turbofan engine have angle of attack?How does a subsonic jet engine intake design ensure correct air intake?What is this F-18 Hornet “air intake” for?How much lift can be generated by the intake lip of a duct?What are the issues involved in converting a quadjet into a twinjet?Why was the Electra uniquely vulnerable to whirl-mode flutter?
$begingroup$
Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings.
This doesn't appear to be a feature common to trijets or even on those with S-ducts.
aircraft-design multi-engine inlet lockheed-tristar tu-154
asked 3 hours ago
zymhanzymhan
747217
$endgroup$
add a comment |
$begingroup$
Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings.
This doesn't appear to be a feature common to trijets or even on those with S-ducts.
aircraft-design multi-engine inlet lockheed-tristar tu-154
asked 3 hours ago
zymhanzymhan
747217
$endgroup$
$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
1
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago
add a comment |
$begingroup$
Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings.
This doesn't appear to be a feature common to trijets or even on those with S-ducts.
aircraft-design multi-engine inlet lockheed-tristar tu-154
asked 3 hours ago
zymhanzymhan
747217
$endgroup$
Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings.
This doesn't appear to be a feature common to trijets or even on those with S-ducts.
aircraft-design multi-engine inlet lockheed-tristar tu-154
aircraft-design multi-engine inlet lockheed-tristar tu-154
asked 3 hours ago
zymhanzymhan
747217
asked 3 hours ago
zymhanzymhan
747217
asked 3 hours ago
zymhanzymhan
747217
asked 3 hours ago
zymhanzymhan
747217
asked 3 hours ago
zymhanzymhan
747217
747217
$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
1
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago
add a comment |
$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
1
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago
$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
1
1
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
This doesn't fully answer the question, but the B727-100 also had an oval engine intake.
AIRLINERS magazine Sept/Oct 99 edition:
"The oval shape inlet on the 727-100 series was changed to a circular design on the stretched 727-200. This was a direct result of the new aircraft's longer fuselage. In flight, the increased lengths from the nose to the center engine inlet increased the thickness of the "boundry layer" of air on the fuselage forward of the inlet. This would have caused aerodynamic "blanking," or disruption of airflow into the center engine, without changes to the design. The circular inlet allowed a smooth flow of air into the engine, as it elevated the bottom of the inlet away from the fuselage boundry layer and into the air stream."
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
$endgroup$
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
This doesn't fully answer the question, but the B727-100 also had an oval engine intake.
AIRLINERS magazine Sept/Oct 99 edition:
"The oval shape inlet on the 727-100 series was changed to a circular design on the stretched 727-200. This was a direct result of the new aircraft's longer fuselage. In flight, the increased lengths from the nose to the center engine inlet increased the thickness of the "boundry layer" of air on the fuselage forward of the inlet. This would have caused aerodynamic "blanking," or disruption of airflow into the center engine, without changes to the design. The circular inlet allowed a smooth flow of air into the engine, as it elevated the bottom of the inlet away from the fuselage boundry layer and into the air stream."
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
$endgroup$
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
add a comment |
$begingroup$
This doesn't fully answer the question, but the B727-100 also had an oval engine intake.
AIRLINERS magazine Sept/Oct 99 edition:
"The oval shape inlet on the 727-100 series was changed to a circular design on the stretched 727-200. This was a direct result of the new aircraft's longer fuselage. In flight, the increased lengths from the nose to the center engine inlet increased the thickness of the "boundry layer" of air on the fuselage forward of the inlet. This would have caused aerodynamic "blanking," or disruption of airflow into the center engine, without changes to the design. The circular inlet allowed a smooth flow of air into the engine, as it elevated the bottom of the inlet away from the fuselage boundry layer and into the air stream."
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
$endgroup$
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
add a comment |
$begingroup$
This doesn't fully answer the question, but the B727-100 also had an oval engine intake.
AIRLINERS magazine Sept/Oct 99 edition:
"The oval shape inlet on the 727-100 series was changed to a circular design on the stretched 727-200. This was a direct result of the new aircraft's longer fuselage. In flight, the increased lengths from the nose to the center engine inlet increased the thickness of the "boundry layer" of air on the fuselage forward of the inlet. This would have caused aerodynamic "blanking," or disruption of airflow into the center engine, without changes to the design. The circular inlet allowed a smooth flow of air into the engine, as it elevated the bottom of the inlet away from the fuselage boundry layer and into the air stream."
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
$endgroup$
This doesn't fully answer the question, but the B727-100 also had an oval engine intake.
AIRLINERS magazine Sept/Oct 99 edition:
"The oval shape inlet on the 727-100 series was changed to a circular design on the stretched 727-200. This was a direct result of the new aircraft's longer fuselage. In flight, the increased lengths from the nose to the center engine inlet increased the thickness of the "boundry layer" of air on the fuselage forward of the inlet. This would have caused aerodynamic "blanking," or disruption of airflow into the center engine, without changes to the design. The circular inlet allowed a smooth flow of air into the engine, as it elevated the bottom of the inlet away from the fuselage boundry layer and into the air stream."
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
answered 2 hours ago
Mike SowsunMike Sowsun
20.9k26885
20.9k26885
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
add a comment |
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
$begingroup$
That's definitely a step in the right direction! On an unrelated note, I love that VP-BAP is one of the few privately owned 727s still operating in the US.
$endgroup$
– zymhan
2 hours ago
add a comment |
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$begingroup$
So I tried looking up some 727 photos to compare, and it looks to me like this photo has an oblong intake: warbirdsnews.com/wp-content/uploads/727finalflight-678x381.png while this one does not: deltamuseum.org/images/site/history-aircraft/boeing-727/… which seems odd?
$endgroup$
– zymhan
2 hours ago
1
$begingroup$
The 727-100 had an oval duct and the 727-200 had a round duct.
$endgroup$
– Sports Racer
2 hours ago