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Why does this 757 have a propeller engine attached to the fuselage?
Clash Royale CLAN TAG#URR8PPP
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I saw the following photo of a Honeywell Aviation Services Boeing 757-225:
If it's not a fake, the airplane has a propeller mounted on a pylon on one side.
What's the purpose of such strange design? Why does it need a propeller engine, if it already has two jet engines? Or is it a permanently deployed RAT?
aircraft-design boeing-757
edited yesterday
ymb1
59.8k5187315
asked yesterday
DP_
565610
 |Â
show 1 more comment
up vote
41
down vote
favorite
I saw the following photo of a Honeywell Aviation Services Boeing 757-225:
If it's not a fake, the airplane has a propeller mounted on a pylon on one side.
What's the purpose of such strange design? Why does it need a propeller engine, if it already has two jet engines? Or is it a permanently deployed RAT?
aircraft-design boeing-757
edited yesterday
ymb1
59.8k5187315
asked yesterday
DP_
565610
18
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
11
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
2
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
2
Now that would be a really big RAT...
– reirab
11 hours ago
 |Â
show 1 more comment
up vote
41
down vote
favorite
up vote
41
down vote
favorite
I saw the following photo of a Honeywell Aviation Services Boeing 757-225:
If it's not a fake, the airplane has a propeller mounted on a pylon on one side.
What's the purpose of such strange design? Why does it need a propeller engine, if it already has two jet engines? Or is it a permanently deployed RAT?
aircraft-design boeing-757
edited yesterday
ymb1
59.8k5187315
asked yesterday
DP_
565610
I saw the following photo of a Honeywell Aviation Services Boeing 757-225:
If it's not a fake, the airplane has a propeller mounted on a pylon on one side.
What's the purpose of such strange design? Why does it need a propeller engine, if it already has two jet engines? Or is it a permanently deployed RAT?
aircraft-design boeing-757
aircraft-design boeing-757
edited yesterday
ymb1
59.8k5187315
asked yesterday
DP_
565610
edited yesterday
ymb1
59.8k5187315
asked yesterday
DP_
565610
edited yesterday
ymb1
59.8k5187315
edited yesterday
ymb1
59.8k5187315
edited yesterday
ymb1
59.8k5187315
59.8k5187315
asked yesterday
DP_
565610
asked yesterday
DP_
565610
asked yesterday
DP_
565610
565610
18
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
11
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
2
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
2
Now that would be a really big RAT...
– reirab
11 hours ago
 |Â
show 1 more comment
18
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
11
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
2
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
2
Now that would be a really big RAT...
– reirab
11 hours ago
18
18
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
11
11
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
2
2
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
2
2
Now that would be a really big RAT...
– reirab
11 hours ago
Now that would be a really big RAT...
– reirab
11 hours ago
 |Â
show 1 more comment
3 Answers
3
active
oldest
votes
up vote
69
down vote
accepted
From the description below the image you linked:
The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event.
A testbed aircraft is an aircraft used for flight research or testing new equipment such as engines.
You can see other photos without engine or with a jet engine instead of a propeller one.
The engine is not needed to fly, but is being tested, and apparently that position has been deemed a good solution to the problem "where do we attach an extra engine we need to do tests on?".
edited yesterday
ymb1
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
add a comment |Â
up vote
36
down vote
The airplane doesn't "need" that engine.
It is a test platform for testing the engine during flight.
Obviously, you don't want to rely on the engine you're testing, in case something goes wrong! So the plane flies with 2 large turbofan engines, while the engineers are testing the smaller engine mounted up front.
If you look closely, you can even see the airplane is labeled "Flight Test".
answered yesterday
abelenky
19.6k856100
add a comment |Â
up vote
15
down vote
Testing a new engine design can only go so far on the ground. At some point, it has to be tested in conditions representative of actual use - in other words, in flight. You don't want to be dependent on an untested engine to get you airborne and back on the ground safely. The solution to this problem is to mount the test article on an aircraft that is entirely airworthy regardless of the operational state of the engine under test. That way the test engine can be put through its paces without compromising the safety of the test crew.
answered yesterday
Anthony X
1,6441015
add a comment |Â
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
69
down vote
accepted
From the description below the image you linked:
The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event.
A testbed aircraft is an aircraft used for flight research or testing new equipment such as engines.
You can see other photos without engine or with a jet engine instead of a propeller one.
The engine is not needed to fly, but is being tested, and apparently that position has been deemed a good solution to the problem "where do we attach an extra engine we need to do tests on?".
edited yesterday
ymb1
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
add a comment |Â
up vote
69
down vote
accepted
From the description below the image you linked:
The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event.
A testbed aircraft is an aircraft used for flight research or testing new equipment such as engines.
You can see other photos without engine or with a jet engine instead of a propeller one.
The engine is not needed to fly, but is being tested, and apparently that position has been deemed a good solution to the problem "where do we attach an extra engine we need to do tests on?".
edited yesterday
ymb1
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
add a comment |Â
up vote
69
down vote
accepted
up vote
69
down vote
accepted
From the description below the image you linked:
The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event.
A testbed aircraft is an aircraft used for flight research or testing new equipment such as engines.
You can see other photos without engine or with a jet engine instead of a propeller one.
The engine is not needed to fly, but is being tested, and apparently that position has been deemed a good solution to the problem "where do we attach an extra engine we need to do tests on?".
edited yesterday
ymb1
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
From the description below the image you linked:
The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event.
A testbed aircraft is an aircraft used for flight research or testing new equipment such as engines.
You can see other photos without engine or with a jet engine instead of a propeller one.
The engine is not needed to fly, but is being tested, and apparently that position has been deemed a good solution to the problem "where do we attach an extra engine we need to do tests on?".
edited yesterday
ymb1
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
edited yesterday
ymb1
59.8k5187315
edited yesterday
ymb1
59.8k5187315
edited yesterday
ymb1
59.8k5187315
59.8k5187315
answered yesterday
Federico♦
24.3k1398150
answered yesterday
Federico♦
24.3k1398150
answered yesterday
Federico♦
24.3k1398150
24.3k1398150
add a comment |Â
add a comment |Â
up vote
36
down vote
The airplane doesn't "need" that engine.
It is a test platform for testing the engine during flight.
Obviously, you don't want to rely on the engine you're testing, in case something goes wrong! So the plane flies with 2 large turbofan engines, while the engineers are testing the smaller engine mounted up front.
If you look closely, you can even see the airplane is labeled "Flight Test".
answered yesterday
abelenky
19.6k856100
add a comment |Â
up vote
36
down vote
The airplane doesn't "need" that engine.
It is a test platform for testing the engine during flight.
Obviously, you don't want to rely on the engine you're testing, in case something goes wrong! So the plane flies with 2 large turbofan engines, while the engineers are testing the smaller engine mounted up front.
If you look closely, you can even see the airplane is labeled "Flight Test".
answered yesterday
abelenky
19.6k856100
add a comment |Â
up vote
36
down vote
up vote
36
down vote
The airplane doesn't "need" that engine.
It is a test platform for testing the engine during flight.
Obviously, you don't want to rely on the engine you're testing, in case something goes wrong! So the plane flies with 2 large turbofan engines, while the engineers are testing the smaller engine mounted up front.
If you look closely, you can even see the airplane is labeled "Flight Test".
answered yesterday
abelenky
19.6k856100
The airplane doesn't "need" that engine.
It is a test platform for testing the engine during flight.
Obviously, you don't want to rely on the engine you're testing, in case something goes wrong! So the plane flies with 2 large turbofan engines, while the engineers are testing the smaller engine mounted up front.
If you look closely, you can even see the airplane is labeled "Flight Test".
answered yesterday
abelenky
19.6k856100
answered yesterday
abelenky
19.6k856100
answered yesterday
abelenky
19.6k856100
answered yesterday
abelenky
19.6k856100
19.6k856100
add a comment |Â
add a comment |Â
up vote
15
down vote
Testing a new engine design can only go so far on the ground. At some point, it has to be tested in conditions representative of actual use - in other words, in flight. You don't want to be dependent on an untested engine to get you airborne and back on the ground safely. The solution to this problem is to mount the test article on an aircraft that is entirely airworthy regardless of the operational state of the engine under test. That way the test engine can be put through its paces without compromising the safety of the test crew.
answered yesterday
Anthony X
1,6441015
add a comment |Â
up vote
15
down vote
Testing a new engine design can only go so far on the ground. At some point, it has to be tested in conditions representative of actual use - in other words, in flight. You don't want to be dependent on an untested engine to get you airborne and back on the ground safely. The solution to this problem is to mount the test article on an aircraft that is entirely airworthy regardless of the operational state of the engine under test. That way the test engine can be put through its paces without compromising the safety of the test crew.
answered yesterday
Anthony X
1,6441015
add a comment |Â
up vote
15
down vote
up vote
15
down vote
Testing a new engine design can only go so far on the ground. At some point, it has to be tested in conditions representative of actual use - in other words, in flight. You don't want to be dependent on an untested engine to get you airborne and back on the ground safely. The solution to this problem is to mount the test article on an aircraft that is entirely airworthy regardless of the operational state of the engine under test. That way the test engine can be put through its paces without compromising the safety of the test crew.
answered yesterday
Anthony X
1,6441015
Testing a new engine design can only go so far on the ground. At some point, it has to be tested in conditions representative of actual use - in other words, in flight. You don't want to be dependent on an untested engine to get you airborne and back on the ground safely. The solution to this problem is to mount the test article on an aircraft that is entirely airworthy regardless of the operational state of the engine under test. That way the test engine can be put through its paces without compromising the safety of the test crew.
answered yesterday
Anthony X
1,6441015
answered yesterday
Anthony X
1,6441015
answered yesterday
Anthony X
1,6441015
answered yesterday
Anthony X
1,6441015
1,6441015
add a comment |Â
add a comment |Â
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18
The plane doesn't need the propeller engine, the propeller engine needs the plane to bring it into the appropriate test conditions.
– DeltaLima
yesterday
11
The livery should be a bit of a hint here. Honeywell is a major manufacturer of avionics and also engines and components.
– Jan Hudec
yesterday
Related: m.flugrevue.de/sixcms/media.php/11/thumbnails/… and aviation.stackexchange.com/q/19669/1084
– Peter
yesterday
2
@JanHudec never mind the company name, the fact that it says “Flight Test†was the clue.
– Notts90
17 hours ago
2
Now that would be a really big RAT...
– reirab
11 hours ago