{"id":210851,"date":"2020-07-23T06:44:00","date_gmt":"2020-07-23T10:44:00","guid":{"rendered":"https:\/\/www.nasa.gov\/?p=210851"},"modified":"2024-03-13T11:25:38","modified_gmt":"2024-03-13T15:25:38","slug":"the-naca-cools-b-29-engines-during-world-war-ii-2","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/history\/the-naca-cools-b-29-engines-during-world-war-ii-2\/","title":{"rendered":"The NACA Cools B-29 Engines During World War II"},"content":{"rendered":"<div id=\"\" class=\"hds-article-hero-header nasa-gb-align-full bg-carbon-90 width-full maxw-full color-mode-dark hds-module hds-module-full wp-block-nasa-blocks-article-hero-header\">\t\t<div class=\"hds-cover-wrapper width-full maxw-full minh-tablet grid-container minh-tablet flex-column padding-0\">\n\t\t\t<div class=\"hds-foreground-wrapper display-flex flex-direction-column\">\n\t\t\t\t<div class=\"grid-container grid-container-block margin-top-auto width-full maxw-desktop-lg padding-y-9 padding-x-3 desktop:padding-x-3 z-400\">\n\t\t\t\t\t<div class=\"z-400 grid-col-12 tablet:grid-col-12 desktop:grid-col-7 z-400\">\n\t\t\t\t\t\t<div class=\"margin-0\">\n\t\t\t\t\t\t\t<div class=\"label color-spacesuit-white margin-bottom-2\">3 Min Read<\/div>\n\t\t\t\t\t\t\t<h1 class=\"heading-41 line-height-md color-spacesuit-white-important\">\n\t\t\t\t\t\t\t\tThe NACA Cools B-29 Engines During World War II\t\t\t\t\t\t\t<\/h1>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"grid-col-12 tablet:grid-col-12 desktop:grid-col-5\"><\/div>\n\t\t\t\t\t<div class=\"skrim-overlay skrim-left mobile-skrim-top z-200\"><\/div>\n\t\t\t\t\t<figure class=\"hds-media-background  \"><img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"463\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2020\/07\/grc-1944-c-05494-e1678704508627.jpg?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"Front view of large World War II aircraft is parked behind hangar.\" style=\"transform: scale(1.2); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"eager\" \/><\/figure>\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"padding-y-3 padding-x-3\">\n\t\t\t<div class=\"grid-container grid-container-block padding-x-0\">\n\t\t\t\t\t\t\t\t<figcaption class=\"hds-caption maxw-mobile desktop:padding-x-3\">\n\t\t\t\t\t<div class=\"hds-caption-text p-sm margin-0 color-carbon-30\">\n\t\t\t\t\t\t<div><figcaption>A Boeing B\u201329 Superfortress parked at the NACA\u2019s laboratory in Cleveland, Ohio. The aircraft was used in July 1944 to flight test a series of modifications developed by researchers to reduce engine heating.<\/figcaption><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"hds-credits color-spacesuit-white-important\">\n\t\t\t\t\t\t<span>Credits: <\/span>\n\t\t\t\t\t\t<span>NASA<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/figcaption>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n<p>In July 1944 a B-29 Superfortress aircraft conducted a series of flight tests at the NACA’s Aircraft Engine Research Laboratory (now NASA Glenn) in Cleveland, Ohio. The tests were part of a national effort to get the new bomber into combat as the Allies sought to turn the tide in the Pacific theater of World War II.<\/p>\n\n\n\n<p>Boeing designed the Superfortress to make precision bombing strikes from altitudes out of reach of enemy defenses. The revolutionary aircraft could fly higher and farther than previous bombers. The rush to get the aircraft into the war, however, resulted in an array of problems.<\/p>\n\n\n\n<p>One of the primary concerns was the overheating of the aircraft\u2019s four Wright R-3350 engines as they struggled to reach high altitudes with their heavy payloads. The center employed several teams of researchers and test facilities to investigate the R-3350 cooling issue.<\/p>\n\n\n\n<p>What they discovered was that design of the R-3350 piston heads did not allow for enough heat dissipation, resulting in exhaust valve failures.  Researchers designed a new elongated cylinder head that had enough surface area to properly disperse the heat.<\/p>\n\n\n\n<p>The R-3350\u2019s carburetor was also not distributing the fuel evenly to each of the engine\u2019s valves, so engineers designed a new impeller to increase the injection flow and create a uniform fuel supply to the cylinders. <\/p>\n\n\n\n<p>During wind tunnel evaluations, researchers discovered there was insufficient cooling in the engine\u2019s exhaust area, so baffles were inserted into the engine to direct the cooling air flow to that area. They also redesigned cowl flaps to increase cooling air without causing further drag.<\/p>\n\n\n\n<p>A B-29 arrived at the laboratory on June 22, 1944 to flight test the NACA findings. Technicians installed the new modifications in the bomber\u2019s two left-wing engines.  Test pilots from Wright Field tested it in the Cleveland skies ten times with different combinations of the modifications.<\/p>\n\n\n\n<p>Overall the flight tests corroborated the wind tunnel and test stand studies. With proper fuel mixture and cowl flap settings the engine attained its maximum range on each flight. The baffles and fuel injection impeller increased performance by 38% during periods of maximum cooling. The investigators estimated that this translated into an extra 10,000 feet of altitude or 35,000 pounds of payload.<\/p>\n\n\n\n<p>The Superfortresses overcame their early travails and became a decisive weapon in the final years of World War II. B-29s went on to perform refueling, reconnaissance, and patrol duties in the post-war years.<\/p>\n\n\n\n<p>Top Image: A Boeing B\u201329 Superfortress parks at the NACA\u2019s laboratory in Cleveland, Ohio. The aircraft was used in July 1944 to flight test a series of modifications developed by researchers to reduce engine heating.<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1106\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?w=2048\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"B-29 bomber on tarmac.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg 5991w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=300,162 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=768,415 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=1024,553 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=1536,829 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=2048,1106 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=400,216 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=600,324 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=900,486 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=1200,648 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/grc-1944-c-05493.jpg?resize=2000,1080 2000w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">A Boeing B-29 beside the hangar in July 1944. The bomber was powered by four Wright R-3350 Cyclone engines.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p><strong><em>Robert S. Arrighi<\/em><br><em>NASA Glenn Research Center<\/em><\/strong><\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 hds-module hds-module-full wp-block-nasa-blocks-related-articles\">\t\t<section class=\"hds-related-articles padding-x-0 padding-y-3 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t\t\t<div class=\"w-100 grid-row grid-container maxw-widescreen padding-0 text-align-left\">\n\t\t\t\t<div class=\"margin-bottom-4\"><h2 style=\"max-width: 100%;\" class=\"width-full w-full maxw-full\">Explore More<\/h2><\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/aircraft-crash-testing\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"233\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg 2700w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=300,233 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=768,597 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=1024,796 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=1536,1195 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=2048,1593 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=400,311 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=600,467 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=900,700 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=1200,933 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/04\/aircraft_crash_test_1955.jpg?resize=2000,1556 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">5 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">Aircraft Crash Testing<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t16 years ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/the-nacas-xf-82-twin-mustang-returns-to-flight-after-70-years\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"143\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg 5084w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=300,143 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=768,365 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=1024,487 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=1536,730 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=2048,973 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=400,190 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=600,285 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=900,428 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=1200,570 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/grc-1949-c-24897.jpeg?resize=2000,950 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">4 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">The NACA\u2019s XF-82 Twin Mustang Returns to Flight After 70 Years<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t2 years ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/centers-and-facilities\/glenn\/nasa-center-boosted-yf-12-supersonic-engine-research\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"159\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/nasa-yf-12.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/nasa-yf-12.jpg 749w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/nasa-yf-12.jpg?resize=300,159 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/nasa-yf-12.jpg?resize=400,212 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/nasa-yf-12.jpg?resize=600,318 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">4 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">NASA Center Boosted YF-12 Supersonic Engine Research<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t4 months ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<\/div>\n\n<div id=\"\" class=\"hds-topic-cards nasa-gb-align-full maxw-full width-full padding-y-6 padding-x-3 color-mode-dark hds-module hds-module-full wp-block-nasa-blocks-topic-cards\">\t\t<div class=\"grid-container grid-container-block-lg padding-x-0\">\n\t\t\t<div class=\"grid-row flex-align-center margin-bottom-3\">\n\t\t\t\t<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n\t\t\t\t\t<div class=\"label color-carbon-60 margin-bottom-2\">Keep Exploring<\/div>\n\t\t\t\t\t<h2 class=\"heading-36 line-height-sm\">Discover More Topics From NASA<\/h2>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row grid-gap-2 hds-topic-cards-wrapper\">\n\t\t\t\t\t<a href=\"#\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Missions<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img decoding=\"async\" loading=\"lazy\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/www.nasa.gov\/wp-content\/plugins\/nasa-blocks\/assets\/images\/topic-cards\/topic-card-sample-1.jpg\" ><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"#\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Humans in Space<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img decoding=\"async\" loading=\"lazy\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/www.nasa.gov\/wp-content\/plugins\/nasa-blocks\/assets\/images\/topic-cards\/topic-card-sample-2.jpg\" ><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"#\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Climate Change<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img decoding=\"async\" loading=\"lazy\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/www.nasa.gov\/wp-content\/plugins\/nasa-blocks\/assets\/images\/topic-cards\/topic-card-sample-3.jpg\" ><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"#\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Solar System<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img decoding=\"async\" loading=\"lazy\" alt=\"\" style=\"transform: scale(1); 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Arrighi<\/div><\/div><div class=\"grid-row\"><div class=\"grid-col-4\"><div class=\"subheading\">Location<\/div><\/div><div class=\"grid-col-8\">Glenn Research Center<\/div><\/div>\t\t\t<\/div>\n\t\t<\/div>\n\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\"><div class=\"padding-top-3 border-top-1px border-color-carbon-black \"><div class=\"margin-bottom-2\"><h2 class=\"heading-14\">Related Terms<\/h2><\/div><ul class=\"article-tags\"><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/history\/\">NASA History<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/aeronautics\/\">Aeronautics<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/technology\/\">Aeronautics Technology<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/centers-and-facilities\/glenn\/glenn-history\/\">Glenn History<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/glenn\/\">Glenn Research Center<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/aeronautics\/nasa-aircraft\/\">NASA Aircraft<\/a><\/li><\/ul><\/div><\/div>\n\t<\/div>\n<\/section>\n\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In July 1944 a B-29 Superfortress aircraft conducted a series of flight tests at the NACA’s Aircraft Engine Research Laboratory (now NASA Glenn) in Cleveland, Ohio. The tests were part of a national effort to get the new bomber into combat as the Allies sought to turn the tide in the Pacific theater of World [...]<\/p>\n","protected":false},"author":119,"featured_media":67968,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"119","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":["283574"],"nasa_hds_core_meta_article_related_articles":["41615","140924","615689"],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[2671,2660,10843,13014,2856,2821],"news-tags":[],"internal-terms":[10924],"coauthors":[10218],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"The NACA Cools B-29 Engines During World War II","url":"https:\/\/www.nasa.gov\/history\/the-naca-cools-b-29-engines-during-world-war-ii-2\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/history\/the-naca-cools-b-29-engines-during-world-war-ii-2\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2020\/07\/grc-1944-c-05494-e1678704508627.jpg?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2020\/07\/grc-1944-c-05494-e1678704508627.jpg"},"articleSection":"NASA History","author":[{"@type":"Person","name":"Robert S. Arrighi"}],"creator":["Robert S. Arrighi"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["Aeronautics","NASA Aircraft","NASA History","Aeronautics Technology","Glenn History","Glenn Research Center"],"dateCreated":"2020-07-23T10:44:00Z","datePublished":"2020-07-23T10:44:00Z","dateModified":"2024-03-13T15:25:38Z"},"rendered":"<meta name=\"parsely-title\" content=\"The NACA Cools B-29 Engines During World War II\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/history\/the-naca-cools-b-29-engines-during-world-war-ii-2\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2020\/07\/grc-1944-c-05494-e1678704508627.jpg?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2020-07-23T10:44:00Z\" \/>\n<meta name=\"parsely-section\" content=\"NASA History\" \/>\n<meta name=\"parsely-tags\" content=\"Aeronautics,NASA Aircraft,NASA History,Aeronautics Technology,Glenn History,Glenn Research Center\" \/>\n<meta name=\"parsely-author\" content=\"Robert S. Arrighi\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":3,"time_ago":"4 years","featured_image":{"id":67968,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2020\/07\/grc-1944-c-05494-e1678704508627.jpg","title":"grc-1944-c-05494","alt":"Front view of large World War II aircraft is parked behind hangar.","caption":"A Boeing B\u201329 Superfortress parks at the NACA\u2019s laboratory in Cleveland, Ohio. The aircraft was used in July 1944 to flight test a series of modifications developed by researchers to reduce engine heating."},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/210851"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/119"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=210851"}],"version-history":[{"count":6,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/210851\/revisions"}],"predecessor-version":[{"id":631216,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/210851\/revisions\/631216"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/67968"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=210851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=210851"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=210851"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=210851"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=210851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}