Aces High Bulletin Board
General Forums => The O' Club => Topic started by: RAIDER14 on December 09, 2005, 09:04:05 PM
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From recent flights on 757s and asking pilots at the AA maintenence facility at AFW I think the 757's engines might be to powerful for the aircraft
listen 2 the engine noise
http://www.flightlevel350.com/viewer.php?id=4751
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Define "too powerful".
I personally think the 757 is "nicely powered".
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Part of designing an over-water, twin engine aircraft has to be consideration given to extended signle engine flight.
With that in mind, a lot of power seems pretty reasonable, especially for an aircraft that regularly spends many hours over arctic nothingness.
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One other thing to consider is with very powerfull engines, while cruising at alt they are running at very low power settings there by being more fuel efficient.
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they need to develope a quiter engine for the 757 though
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Is that like a "girl too sexy"?
A great thing about an "overpowered" aircraft is single engine climb capability when you lose an engine on takeoff. This gives a much improved margin of safety in one of the most critical phases of flight.
dago
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Buy Etymotics. (http://www.etymotic.com/ephp/er6.aspx)
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Originally posted by RAIDER14
they need to develope a quiter engine for the 757 though
Who?
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Magical genies.
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Who?
any aircraft engine company or just develope a more advanced hush kit
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The Hush Kit that my wife had installed on me is pretty powerful... I'll put her in contact with the engine genies...maybe they can work something out. :lol
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guys we gottta understand that 757 is 1970s plane. Right now boing has 767 and 777s. 767s and 777 planes's engines are powerfull too but much quiet now :)
(http://www.icfn.net/bluesky/air1/4X-ECA%20-%20BOEING%20777-258ER%20%5BEL%20AL%5D.jpg)
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The fact that the 757 is out of production is also relevant to the discussion.
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Originally posted by Chairboy
The fact that the 757 is out of production is also relevant to the discussion.
Too bad.. only thing it really needs is the modern engines and it'd be still popular.
Otherwise its only problem is the turbulence category of heavy, for a medium size plane.
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Originally posted by Hornet33
One other thing to consider is with very powerfull engines, while cruising at alt they are running at very low power settings there by being more fuel efficient.
IIRC turbines are in their most efficient use when running close to the max rpm (fuel usage vs thrust) or at least they were 10 years ago.
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Originally posted by Staga
IIRC turbines are in their most efficient use when running close to the max rpm (fuel usage vs thrust) or at least they were 10 years ago.
They're definitely not running at 'very low' power settings, but closer to max, although not _really_ close to max.
Most planes with max thrust could easily overspeed beyond approved structucal speed limit.
However theres another thing to it also: maintenance.
Higher RPM means higher maintenance cost, which is one reason why pilots can choose derated power settings for takeoff and climb.
The thing with jets is the temperature - higher altitude means colder outside temperature and that makes jet engines more efficient.
The colder it is, the less fuel is needed for a distance.
Which again means less power.
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Originally posted by RAIDER14
From recent flights on 757s and asking pilots at the AA maintenence facility at AFW I think the 757's engines might be to powerful for the aircraft
listen 2 the engine noise
http://www.flightlevel350.com/viewer.php?id=4751
When ur fighting against the "pull" of a planet, a plane can never be overpowered. Like John Travolta said, "You can never have too much power", you just need a throttle!
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Its nice to watch 757 which is pretty much empty of fuel, gargo and pax to take-off. After 700m run up we go, and Bae Hawk has no chance to climb with it. About 2 mins to fl 100 from rolling...
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