brons2
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CFM56-7B Military Power On P8A?

Fri Sep 16, 2011 6:47 am

Hello, my question is a fairly simple one. Does the CFM56-7B on the P8A Poseidon have an additional military power rating that is above and beyond the 27,000 lbs the engine develops in airline service?

TIA,
Jim
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Dreadnought
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RE: CFM56-7B Military Power On P8A?

Fri Sep 16, 2011 4:56 pm

Quoting brons2 (Thread starter):
Does the CFM56-7B on the P8A Poseidon have an additional military power rating that is above and beyond the 27,000 lbs the engine develops in airline service?

I don't know, but you have to love the idea of a 737 with bomb bay doors.

My other thought is why a jet? Wouldn't a more modern turboprop be more suitable for low/slow sub-hunting? How about adapting the C-130 for the job?
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bikerthai
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RE: CFM56-7B Military Power On P8A?

Fri Sep 16, 2011 6:36 pm

Quoting Dreadnought (Reply 1):
My other thought is why a jet?

Not just a jet . . . a 737!

Cost is a major factor. The 737 is built on an existing commercial line with mostly commercial components and processes. Spares and other support can be obtained though the world wide spares net work etc ...

True, a jet is not as efficient at low speed, but it can get there faster thus reducing the search area required.

Other than the C-130 or A-400, there are no turboprop out there that can match the volume. And even though the volume of the P-8 is bigger than the P-3, the amount of "stuff" they are putting on make them want a larger airframe 

BTW does the US make any modern commercial turboprop any more?

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litz
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RE: CFM56-7B Military Power On P8A?

Fri Sep 16, 2011 8:53 pm

C-130J is more than a bit modern ...
 
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kc135topboom
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RE: CFM56-7B Military Power On P8A?

Sun Sep 18, 2011 10:58 pm

The P-8A is air refuelable with a Boom equipped Tanker. It is also not replacing the P-3C on the ASW missions, but replace the EP-3E on some of its missions. The P-8A is also better at detecting modern SSKs than the P-3C is.

The CFM-56-7B27C engine develope 27,300 lbs of maximum thrust, and does have an emergency thrust that is well above the maximum .
 
redflyer
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RE: CFM56-7B Military Power On P8A?

Tue Sep 20, 2011 3:45 pm

Quoting Dreadnought (Reply 1):
but you have to love the idea of a 737 with bomb bay doors.

Makes one fantasize about other civil aircraft that could be "militarized"...how about an A380 with bomb bay doors and other ordinance carrying capabilities? Ah, so nice to day dream!  
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Max Q
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RE: CFM56-7B Military Power On P8A?

Thu Sep 22, 2011 6:14 am

Does the P8 carry additional fuel in auxiliary tanks ?
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rwessel
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RE: CFM56-7B Military Power On P8A?

Thu Sep 22, 2011 8:56 pm

Quoting Max Q (Reply 6):
Does the P8 carry additional fuel in auxiliary tanks ?

Yes it does. I've read six additional tanks, which would lead me to expect that they're just the standard 737 cargo deck aux tanks.
 
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Stitch
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RE: CFM56-7B Military Power On P8A?

Fri Sep 23, 2011 3:38 pm

Quoting redflyer (Reply 5):
Makes one fantasize about other civil aircraft that could be "militarized"...
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eskimotail
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RE: CFM56-7B Military Power On P8A?

Fri Sep 23, 2011 5:21 pm

Quoting rwessel (Reply 7):
Yes it does. I've read six additional tanks, which would lead me to expect that they're just the standard 737 cargo deck aux tanks

P8 has a total of 7 aux tanks, 10 fuel tanks total. They are not the standard 737 cargo deck aux fuel tanks that BBJ and other military 737s carry. Tactical aircraft vs logistics aircraft = major delta.

Quoting KC135TopBoom (Reply 4):
not replacing the P-3C on the ASW missions, but replace the EP-3E on some of its missions.

EP-3 replacement not ordered yet by USN, P8 is a direct 1 for 2 replacement for the P3C in ASW role.

Quoting Dreadnought (Reply 1):
My other thought is why a jet? Wouldn't a more modern turboprop be more suitable for low/slow sub-hunting? How about adapting the C-130 for the job

Why does a sub hunt have to be done low and slow? The detection mechanisms are remote from the airplane once deployed. Can't share specificly but P8 in its final blocks or tranches will not prosecte ASW in the way we know it now. A high altitude, cruise optimised power plant and wing with .88 MACH or better dash speed will be just fine, and capable of things that a C-130 can not do. Read up on all the available releases and articles over the last 7 years and it will become clear.
 
Max Q
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RE: CFM56-7B Military Power On P8A?

Sat Sep 24, 2011 1:05 am

A 737 capable of .88 Mach ?
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eskimotail
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RE: CFM56-7B Military Power On P8A?

Sat Sep 24, 2011 5:39 am

Quoting Max Q (Reply 10):
A 737 capable of .88 Mach ?

oops, too many eights. sorry.
 
Max Q
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RE: CFM56-7B Military Power On P8A?

Sat Sep 24, 2011 10:03 pm

Eskimo,


Do you know how much fuel the P8 can carry altogether ?



Seems like an impressive Aircraft.
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eskimotail
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RE: CFM56-7B Military Power On P8A?

Tue Sep 27, 2011 5:11 pm

Quoting Max Q (Reply 12):

Do you know how much fuel the P8 can carry altogether

Approx 70 ,000 pounds, 10,600 gallons. Give or take.
 
Max Q
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RE: CFM56-7B Military Power On P8A?

Wed Sep 28, 2011 1:08 am

Quoting Eskimotail (Reply 13):

Approx 70 ,000 pounds, 10,600 gallons. Give or take.

Almost as much as a 757, that should give it impressive endurance.
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