Pratt & Whitney XT57

One XT57 (PT5), a turboprop development of the J57, was installed in the nose of a JC-124C (BuNo 52-1069), and tested in 1956.{{sfn|Francillon|1979|p=470}}{{sfn|Connors|2010|p=294}}

Rated at {{convert|15000|hp|kW|adj=pre|shaft}}, the XT57 was the most powerful turboprop engine in existence at the time,{{cite news |issn=0099-9660 |work=Wall Street Journal |title=United Aircraft Sales near Billion |date=October 17, 1956 |page=25 |department=Abreast of the Market }} and it remains the most powerful turboprop ever built in the United States.{{cite book |title=Ultra-Large Aircraft, 1940-1970 |url=https://books.google.com/books?id=I5hUDwAAQBAJ&pg=PA84 |given=William Patrick |surname=Dean |year=2018 |pages=84–87 | publisher=McFarland |isbn=9781476665030 |oclc=1034989209}} The engine had a split-compressor (also known as "two-spool") design.{{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=News Digest |url=https://archive.org/details/Aviation_Week_1955-06-27/page/n3 |page=7 |date=June 27, 1955 |volume=62 |number=26}}

Intended for use on the Douglas C-132 aircraft, the XT57 turboprop used a Hamilton Standard Model B48P6A propeller with a diameter of {{convert|20|ft|m|abbr=off|sp=us}}, which was the largest diameter propeller to be used in flight at the time.{{cite book |title=Guinness Book of World Records |url=https://books.google.com/books?id=uAUTAQAAMAAJ&q=t57 |page=195 |year=1964 |publisher=Bantam Books |given1=Norris |surname1=McWhirter |given2=Ross |surname2=McWhirter |oclc=803932209}} The single-rotation propeller had four hollow steel blades,{{cite book |isbn=9781852605971 |surname=Gunston |given=Bill |title=World Encyclopaedia of Aero Engines: All Major Aircraft Power Plants, from the Wright Brothers to the Present Day |url={{GBurl|cIxTAAAAMAAJ|q=B48}} |page=135 |year=1998 |edition=4th |publisher=Patrick Stephens |oclc=754087992}} a maximum blade chord of {{convert|22|in|cm|abbr=off|sp=us}}, a length of {{cvt|5.5|ft|ftin m|order=out}}, and a weight of {{convert|3600|lb|kg|abbr=off}}.{{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=Nose-Mounted Prop |url=https://archive.org/details/Aviation_Week_1957-10-21/page/n53 |date=October 21, 1957 |page=106 |volume=67 |number=16}}

In the late 1950s, the XT57 was studied for use in a United States Navy-proposed, nuclear-powered conversion of a Saunders-Roe Princess flying boat.{{cite tech report |date=April 1 – June 30, 1959 |title=Study of Seaplane Systems Employing Nuclear Power |author=Martin Nuclear Division |pages=v to [https://www.osti.gov/servlets/purl/1471210#page=40 I-28] |section=Summary to Part I.II: Nuclear Powered ASW System Studies |section-format=PDF |osti=1471210 |section-url=https://www.osti.gov/servlets/purl/1471210#page=8 |doi=10.2172/1471210 |oclc=8160144848}}{{cite tech report |given=S. |surname=Comassar |editor-given=D. H. |editor-surname=Culver |title=Aircraft Nuclear Propulsion Application Studies |section=2.4: 'Princess' Flying Boat |section-url=https://digital.library.unt.edu/ark:/67531/metadc843045/m2/1/high_res_d/1048126.pdf#page=43 |pages=40–48 |publication-date=April 30, 1962 |series=Aircraft Nuclear Propulsion Program |oclc=1065745839}} Despite not having entered service, the engine was selected because it had passed a Pratt & Whitney 150-hour testing program, which involved running the engine for 5,000–7,000 hours.ANP Program, April 15, 1958: Another engine which we are looking at is the T-57. This is a Pratt and Whitney turboprop engine which was developed for the C-132 airplane. It has passed its 50 hour official qualification. It has passed a 150 hour company test which takes 5 to 7 thousand hour running in total. It has no bugs as far as we can determine. It is now sitting on the shelf and not being used because the C-132 has been cancelled. This as far as we can see is an excellent engine. (Captain Richardson, p. 71)

;T57/PT5: A turboprop engine driving a {{cvt|20|ft|m|adj=mid|diameter}} Hamilton Standard Turbo-Hydromatic propeller,{{cite book |title=Jane's All the World's Aircraft 1957–58 |oclc=495002766 |page=444 |url={{GBurl|id=YqE7AAAAMAAJ|q=T57}} |publisher=Sampson Low, Marston & Company}} {{convert|15000|hp|kW|abbr=on|0}} turboprop to be used on the Douglas C-132, a Mach 0.8 speed military transport aircraft.{{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=First Douglas C-132 Details |url=https://archive.org/details/Aviation_Week_1956-10-22/page/n17 |page=35 |date=October 22, 1956 |volume=65 |number=17}}

• Douglas JC-124C Globemaster II testbed
• Douglas C-132 (not built)

The XT57 engine is on display at the Pratt & Whitney museum in East Hartford, Connecticut.{{cite web |work=Aircraft Engine Historical Society (AEHS) |title=Official Program: Third Annual AEHS Convention |url=http://www.enginehistory.org/Convention/Programs/2006Prog.pdf#page=3 |pages=3–4 |date=July 6–9, 2006 |access-date=2020-06-15 |archive-date=2020-06-15 |archive-url=https://web.archive.org/web/20200615201416/http://www.enginehistory.org/Convention/Programs/2006Prog.pdf#page=3 |url-status=live }}

{{jetspecs

|ref=

|type=Split-compressor turboprop

|length=

|diameter=

|weight={{cvt|6600|lb}}{{cite web |work=Aircraft Engine Historical Society (AEHS) |given=Doug |surname=Culy |title=Wright's T35 Turboprop Engine, et al. |url=https://www.enginehistory.org/GasTurbines/Wright/T35/WrightT35.shtml |access-date=June 6, 2020 |url-status=live |archive-date=November 17, 2019 |archive-url=https://web.archive.org/web/20191117212203/http://www.enginehistory.org/GasTurbines/Wright/T35/WrightT35.shtml}}

• Propeller weight: {{cvt|3600|lb}}

|compressor=

|combustion=

|turbine=4-stage low pressure turbine

|fueltype=

|oilsystem=

|power={{convert|15000|shp|kW|abbr=on|0|adj=pre|equivalent}}

|thrust=

|compression=

|bypass=

|aircon=

|turbinetemp=

|fuelcon=

|specfuelcon=0.55 lb/shp/h

|power/weight=

|thrust/weight=

}}

{{Aircontent

|related=

• Pratt & Whitney J52/JT8A
• Pratt & Whitney J57/JT3C
• Pratt & Whitney J75/JT4A
• Pratt & Whitney TF33/JT3D

|similar engines=

• Europrop TP400
• Kuznetsov NK-12

|lists=

• List of aircraft engines

|see also=

}}

{{Reflist}}

{{refbegin}}

• {{cite book |last=Connors |first=Jack |editor-surname=Allen |editor-given=Ned |title=The Engines of Pratt & Whitney: A Technical History |chapter=Chapter 9. Transition to Turbofans |publisher=American Institute of Aeronautics and Astronautics (AIAA) |location=Reston, Virginia |year=2010 |isbn=978-1-60086-711-8 |pages=291–317 |oclc=7377808823 |doi=10.2514/5.9781600867293.0291.0317}}
• {{cite book |surname=Mulready |given=Richard C. |title=Advanced Engine Development at Pratt & Whitney: The Inside Story of Eight Special Projects, 1946–1971 |chapter=Chapter 2. T57 – The Largest Turboprop |pages=19–28 |date=February 16, 2001 |location=Warrendale, Pennsylvania |publisher=Society of Automotive Engineers (SAE) |oclc=248492401 |isbn=978-0-7680-0664-3 |volume=252}}
• {{cite journal |issn=0028-1484 |surname=James |given=Carolyn C. |date=Spring 2000 |title=The Politics of Extravagance: The Aircraft Nuclear Propulsion Project |journal=Naval War College Review |volume=53 |number=2 |pages=158–190 |url=https://digital-commons.usnwc.edu/nwc-review/vol53/iss2/7 |oclc=8131851614 |jstor=44638305}}
• {{cite book |surname=Francillon |given=René J. |title=McDonnell Douglas Aircraft since 1920 |location=London |publisher=Putnam |year=1979 |isbn=0-370-00050-1 |oclc=442201768}}
• {{cite report |ref=ANP19580415 |author=United States Congress, Subcommittee on Research and Development of the Joint Committee on Atomic Energy |title=Aircraft Nuclear Propulsion (ANP) Program |location=Washington, D.C. |date=April 15, 1958 |id={{ProQuest|}}|pages=71, 77, 82–84, 91–92, 96}}

{{refend}}

• {{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=Aircraft Power – in Whatever Form It Takes |url=https://archive.org/details/Aviation_Week_1957-04-15/page/n30 |date=April 15, 1957 |pages=60–61 |volume=66 |number=15 |author=Pratt, Whitney Aircraft |author-link=Pratt & Whitney }}
• {{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=Douglas C-124 Test Bed |url=https://archive.org/details/Aviation_Week_1957-01-14/page/n0 |date=January 14, 1957 |pages=Cover, [https://archive.org/details/Aviation_Week_1957-01-14/page/n9 19] |volume=66 |number=2}}
• {{cite magazine |issn=0005-2175 |magazine=Aviation Week |title=New Propeller for Supersonic Flight |url=https://archive.org/details/Aviation_Week_1955-09-26/page/n10 |date=September 26, 1955 |department=Air Transport |page=20 |volume=63 |number=13}}

{{Pratt & Whitney aeroengines}}

{{USAF gas turbine engines}}

{{DEFAULTSORT:Pratt and Whitney T57}}

Category:1950s turboprop engines

XT57