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Usaf E-8 Re-engine Program  
User currently offlineB727LVR From United States of America, joined Jul 2008, 630 posts, RR: 0
Posted (3 years 5 months 1 week 1 day 22 hours ago) and read 6565 times:

A question was asked in the OMEGA accident thread abuot 707's being re-engined with JT8D-219 engines. Doing some research I found that the USAF is going to put the -219 engine on their E-8's instead of the CFM engine like the KC-135 and so on. Any guesses as to why?

http://www.pw.utc.com/media_center/assets/me_jt8d-219_product_card.pdf

http://www.pw.utc.com/media_center/p.../2001/11_nov/11-7-2001_6112724.asp

http://www.youtube.com/watch?v=16Ts8Ebkd_I&feature=related

http://www.youtube.com/watch?v=8-IHRw-UbV0&feature=related


I'm like a kid in a candy store when it comes to planes!
15 replies: All unread, jump to last
 
User currently offlineZANL188 From United States of America, joined Oct 2006, 3546 posts, RR: 0
Reply 1, posted (3 years 5 months 1 week 1 day 17 hours ago) and read 6439 times:
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IIRC the CFM had an adverse impact on the operation of the mission radar that the JT8D did not.


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User currently offlinelitz From United States of America, joined Dec 2003, 1767 posts, RR: 0
Reply 2, posted (3 years 5 months 1 week 1 day 17 hours ago) and read 6416 times:
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To clarify - the JT8D is a much narrower profile, and therefore doesn't block part of the radar operating area ...

That big fat fan (by comparison) on the CFM simply gets in the way.


User currently offlineLAXintl From United States of America, joined May 2000, 25776 posts, RR: 50
Reply 3, posted (3 years 5 months 1 week 1 day 16 hours ago) and read 6395 times:

Good previous discussion here:
Re-engined E-8 To Begin Flight Test 17 Dec. 08 (by KC135TopBoom Dec 6 2008 in Military Aviation & Space Flight)

Also article discussing the choice of CFM versus JT8D.
http://www.defenseindustrydaily.com/Re-engining-the-E-8-JSTARS-04891/

http://media.defenseindustrydaily.com/images/AIR_E-8C_Re-engined_First_Flight_2008-12-20_lg.jpg



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User currently onlinedlednicer From United States of America, joined May 2005, 545 posts, RR: 7
Reply 4, posted (3 years 5 months 6 days 15 hours ago) and read 6032 times:
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As this picture shows, the smaller JT8D-200 nacelles also work well with the MS-177 Senior Year sensor:


User currently offlineJoeCanuck From Canada, joined Dec 2005, 5476 posts, RR: 30
Reply 5, posted (3 years 5 months 5 days 7 hours ago) and read 5830 times:

It sounds like a shockingly sensible idea. A 19% savings in fuel burn, probably millions more per plane saved in retrofitting each plane, a huge performance increase, works better with their sensor arrays, way cheaper per engine...and only 6% less fuel efficient than the -56.

Makes so much sense I'm surprised they are actually doing it.



What the...?
User currently offlinelitz From United States of America, joined Dec 2003, 1767 posts, RR: 0
Reply 6, posted (3 years 5 months 2 days 17 hours ago) and read 5584 times:
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And don't forget, as the DC9's and MD80s get retired ... a plentiful supply of engines and engine parts.

- litz


User currently offlineSpacepope From Vatican City, joined Dec 1999, 2952 posts, RR: 1
Reply 7, posted (3 years 5 months 2 days 16 hours ago) and read 5574 times:

Quoting litz (Reply 6):
And don't forget, as the DC9's and MD80s get retired ... a plentiful supply of engines and engine parts.

- litz

How would the DC-9 retirement help?

Pratt has just recently restarted production of the JT8D-219 for this project. The E-8 will get new production units.



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User currently offlineB727LVR From United States of America, joined Jul 2008, 630 posts, RR: 0
Reply 8, posted (3 years 5 months 1 day 8 hours ago) and read 5423 times:

Quoting Spacepope (Reply 7):
Pratt has just recently restarted production of the JT8D-219 for this project. The E-8 will get new production units.

This is huge for P&W... enough engines for 17 aircraft, plus spares... This is a good sum of money. Looks like the 707 is going the way of the the B-52 for the military...



I'm like a kid in a candy store when it comes to planes!
User currently offlineAWACSooner From United States of America, joined Jan 2008, 1934 posts, RR: 1
Reply 9, posted (3 years 4 months 4 weeks 9 hours ago) and read 5261 times:

Too bad they're not even thinking about re-engining my aircraft.

User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12158 posts, RR: 51
Reply 10, posted (3 years 4 months 4 weeks 2 hours ago) and read 5212 times:

Quoting AWACSooner (Reply 9):
Too bad they're not even thinking about re-engining my aircraft.

It would make sense to reengine the USAF E-3B/Cs with the F-108 (CFM-56) engines of the E-6Bs, KC-135Rs, and some RC-135 models..


User currently offlineSpacepope From Vatican City, joined Dec 1999, 2952 posts, RR: 1
Reply 11, posted (3 years 4 months 4 weeks 1 hour ago) and read 5198 times:

Quoting KC135TopBoom (Reply 10):
It would make sense to reengine the USAF E-3B/Cs with the F-108 (CFM-56) engines of the E-6Bs, KC-135Rs, and some RC-135 models..

Nah, give them the JT8D, they can have thrust reversers then!

AWACSSooner: wasn't the mantra a few years ago "We've got all the JT3s we ever need" in storage?



The last of the famous international playboys
User currently offlineAWACSooner From United States of America, joined Jan 2008, 1934 posts, RR: 1
Reply 12, posted (3 years 4 months 3 weeks 6 days 20 hours ago) and read 5128 times:

Quoting Spacepope (Reply 11):
AWACSSooner: wasn't the mantra a few years ago "We've got all the JT3s we ever need" in storage?

That was BEFORE most of them were de-rated on their thrust and sent to re-engine all the Buffs. Can't go into too much detail, but it's now a point of concern for my airframe.


User currently offlineJoeCanuck From Canada, joined Dec 2005, 5476 posts, RR: 30
Reply 13, posted (3 years 4 months 3 weeks 5 days 19 hours ago) and read 4984 times:

Quoting AWACSooner (Reply 12):

Maybe take the big dish off of the top the slide a frame or two into the E-8 re-engine line...who'd know...?



What the...?
User currently offlineAWACSooner From United States of America, joined Jan 2008, 1934 posts, RR: 1
Reply 14, posted (3 years 4 months 3 weeks 5 days 18 hours ago) and read 4972 times:

The lack of a trough radar underneath would give us away...

User currently offlineJoeCanuck From Canada, joined Dec 2005, 5476 posts, RR: 30
Reply 15, posted (3 years 4 months 3 weeks 5 days 14 hours ago) and read 4921 times:

Quoting AWACSooner (Reply 14):
The lack of a trough radar underneath would give us away...

...eventually...maybe. Tell 'em it's in the shop...or it's got the new slim contoured double extra dopplerish super wide scan, flush mounted unit...very hush, hush.



What the...?
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