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of risk that comes with brand-new technology, and that would require a tremendous amount of validation to be done. We’re saying, the AETP is not the right fit for the F-35.” Instead, Pratt & Whitney is proposing a "drop-in" enhanced engine package that would improve thrust and range by 10% while also offering a 50% improvement in thermal management. While this falls short of the AETP's goal of a 25% improvement in fuel efficiency, Pratt & Whitney argues the savings would be worth it, estimating the cost of developing AETP for the F-35 at up to $ 40 Billion. As of 2021, thermal management had been an ongoing issue for the F135, largely due to the increased sustainment and maintenance costs caused from heat damage by running the engines hotter in order to take full advantage of newer, more powerful sensors and electronics being integrated into Block 4+ F-35s. The sensors and electronics subsequently require additional cooling to take full advantage of the aircraft's capability. GE had previously stated that one advantage of their AETP
172:(AFLCMC) in 2018 increased the focus on re-engining of the F-35; there has also been investigations on applying the technology in upgrades for F-15, F-16, and F-22 propulsion systems. In June 2018, Pratt & Whitney changed its development plan for the F135, and instead offered an adaptive three-stream fan as Growth Option 2.0 that is separate from the XA101, which would instead have a new engine core. In 2020, the F135 development plan shifted from "Growth Options" to "Engine Enhancement Packages" (EEP), while the three-stream XA101 is a new engine with potential re-engining for the F-35A. Ground testing of the XA101 began in September 2021.
156:(VAATE) program. While not involved with ADVENT, Pratt & Whitney was selected alongside General Electric for the Adaptive Engine Technology Demonstrator (AETD) program that followed in 2012; this program continued to mature the technology, with tests performed using demonstrator engines. The next step, the Adaptive Engine Transition Program (AETP), was launched in 2016 to develop adaptive engines for sixth-generation fighter propulsion as well as potential re-engining of the F-35 from the existing
40:
175:
Also in
September 2021, Pratt & Whitney publicly stated serious doubts about the cost effectiveness of AETP's future for the F-35, stating that the XA101 was "always intended … to be a sixth-generation ." Jennifer Latka, Vice President of the F135 program, explained: “There’s a significant amount
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The XA101 is a three-stream adaptive cycle engine that can adjust the bypass ratio and fan pressure to increase fuel efficiency or thrust, depending on the scenario. It does this by employing a third bypass stream around the entire engine, with the ability to modulate the portion of airflow into the
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engine is its third airstream, which its officials say can be used to help cool the F-35’s electronics. Nonetheless, Latka urged an official review of the program's requirements, stating, “We need to crystallize on what the requirement is, and then we figure out what the most cost-effective solution
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engine core or through this third stream, to increase fuel economy and act as a heat sink for cooling. This capability enables greater use of the high-speed, low-altitude portion of the F-35 flight regime. The increased cooling and power generation also enables the potential employment of
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In 2017, Pratt & Whitney successfully tested an adaptive three-stream fan with an F135 core, and considered the XA101 to be "Growth Option 2.0" in its long-term development plan for the F135. Further contract awards and modifications from
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and cooling or to the core and fan streams for additional thrust and performance. The 45,000 lbf (200 kN) thrust class engine is expected to be significantly more powerful and efficient than existing low-bypass turbofans.
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and the P&W engine was designated XA101. The AETP goal was to demonstrate 25% improved fuel efficiency, 10% additional thrust, and improved thermal management.
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in the future. When additional thrust is needed, the air from the third stream can be directed into the core and fan streams for increased performance.
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Versatile
Affordable Advanced Turbine Engines Provide Game Changing Capability with Superior Fuel Efficiency
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358:. 11th Annual Science & Engineering Technology Conference/DoD Tech Expo. Charleston, South Carolina.
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The U.S. Air Force and U.S. Navy began pursuing the adaptive cycle engine concept in 2007 with the
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The three-stream adaptive cycle design can direct air to the bypass third stream for increased
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452:"Eyeing the future fighter, Pratt & Whitney hits milestone with new adaptive engine"
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XA101 adaptive fan being tested at Arnold
Engineering Development Complex (AEDC)
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585:"Pratt Testing XA101 Adaptive Engine, Has Two Offerings for F-35 Propulsion"
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turbofan engine. The
General Electric demonstrator was designated
507:"USAF starts work on defining adaptive engine for future fighter"
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631:
607:"Pratt Pushes Alternative to New Adaptive Engine for F-35"
559:"F-35 Engine Upgrade Would Enable Directed Energy Weapons"
478:"GE Details Sixth-Generation Adaptive Fighter Engine Plan"
120:
and form the technological foundation for the company's
426:"P&W Outlines Three-step F135 Development Pathway"
533:"P&W Outlines New Plan for F-35 Engine Upgrades"
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400:"US Air Force Funds Next Advanced Engine Stage"
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154:Versatile Affordable Advanced Turbine Engines
8:
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557:Norris, Guy; Anselmo, Joe (21 July 2018).
277:45,000 lbf (200 kN) class (with
181:is once we understand that requirement."
128:'s sixth generation fighter program, the
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152:(ADVENT) program, a part of the larger
1366:Pratt & Whitney Canada aeroengines
450:Insinna, Valerie (18 September 2017).
170:Air Force Life Cycle Management Center
29:
367:
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7:
2365:Pratt & Whitney aircraft engines
349:Thomson, Daniel E. (14 April 2010).
294:Adaptive Versatile Engine Technology
150:Adaptive Versatile Engine Technology
583:Tirpak, John A. (1 October 2021).
424:Kjelgaard, Christ (15 June 2017).
230:Three-stream adaptive cycle engine
25:
531:Kjelgaard, Chris (13 June 2018).
118:Lockheed Martin F-35 Lightning II
96:Lockheed Martin F-35 Lightning II
112:demonstrator being developed by
38:
505:Trimble, Steven (9 July 2018).
476:Norris, Guy (29 January 2015).
1301:Pratt & Whitney Rocketdyne
605:Tirpak, John A. (2021-09-09).
27:American adaptive cycle engine
1:
1359:Joint development aeroengines
211:Specifications (XA101-PW-100)
130:Next Generation Air Dominance
1408:gas turbine aircraft engine
398:Mehta, Aaron (1 July 2016).
372:Jim Mathews (26 June 2017).
537:Aviation International News
430:Aviation International News
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1296:Pratt & Whitney Canada
124:propulsion system for the
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306:Pratt & Whitney XA103
106:Pratt & Whitney XA101
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1342:Richard "Dick" Soderberg
838:Free-piston gas turbines
330:List of aircraft engines
374:"Engines of Innovation"
222:General characteristics
192:directed-energy weapons
126:United States Air Force
2321:Adaptive cycle engines
1406:United States military
613:. AirForceMagazine.com
318:General Electric XA100
110:adaptive cycle engine
56:Adaptive cycle engine
1337:Frederick Rentschler
204:Lockheed Martin F-35
1260:Aeroderivative gas
659:Pratt & Whitney
300:Related development
114:Pratt & Whitney
76:Pratt & Whitney
1410:designation system
770:Twin Wasp (R-2000)
765:Twin Wasp (R-1830)
611:Air Force Magazine
589:Air Force Magazine
378:Air Force Magazine
312:Comparable engines
91:Major applications
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815:H piston engines
780:Twin Wasp Junior
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105:
103:
1725:Turboshafts
1332:Perry Pratt
1140:Turboshafts
795:Wasp Junior
785:Wasp series
775:Twin Wasp E
760:Twin Hornet
745:Double Wasp
456:DefenseNews
404:DefenseNews
279:afterburner
262:Performance
256:Compressor:
244:Dry weight:
144:Development
2039:LHTEC T800
1720:Turboprops
1310:Key people
1136:Turboprops
800:Wasp Major
750:Hornet (A)
617:2022-04-17
568:11 January
542:11 January
516:11 January
487:11 January
461:11 January
435:11 January
409:11 January
336:References
250:Components
98:(planned)
82:First run
2064:Turbofans
1418:Turbojets
1363:See also:
951:Turbofans
856:Turbojets
239:Diameter:
216:Data from
206:(planned)
2359:Category
2044:APW T800
1862:variants
1223:Propfans
1206:T800-APW
1061:SuperFan
755:Hornet B
723:R-2180-E
718:R-2180-A
288:See also
268:Maximum
132:(NGAD).
116:for the
1860: (
1275:GG4/FT4
1270:GG3/FT3
1050:RTF-180
1020:PW1000G
234:Length:
1231:578-DX
1154:JFTD12
1056:STF200
1045:PW6000
1040:PW5000
1035:PW4000
1030:PW2000
1025:PW1120
990:JTF10A
959:GP7000
738:R-4360
733:R-2800
728:R-2270
713:R-2060
708:R-2000
703:R-1860
698:R-1830
693:R-1690
688:R-1535
683:R-1340
383:14 May
270:thrust
185:Design
33:XA101
2344:XA103
2339:XA102
2334:XA101
2329:XA100
2199:YF120
1676:YJ101
1148:APW34
1126:XA103
1121:XA101
1067:V2500
1015:JTF22
1010:JTF17
1005:JTF16
1000:JTF14
995:JT10D
985:JTF10
678:R-985
356:(PDF)
228:Type:
178:XA100
162:XA100
122:XA103
85:2021
52:Type
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2019:T702
2014:T701
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894:JT11
884:JT8A
869:JT4A
864:JT3C
790:Wasp
570:2020
544:2020
518:2020
489:2020
463:2020
437:2020
411:2020
385:2021
158:F135
104:The
1963:T80
1958:T78
1953:T76
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