{"id":225,"date":"2021-02-23T03:27:46","date_gmt":"2021-02-23T03:27:46","guid":{"rendered":"http:\/\/andrewgoering.com\/?p=225"},"modified":"2023-01-07T20:41:53","modified_gmt":"2023-01-07T20:41:53","slug":"certification-and-payload-test-rocket","status":"publish","type":"post","link":"http:\/\/andrewgoering.com\/?p=225","title":{"rendered":"Certification and Payload Test Rocket"},"content":{"rendered":"\n<p>Earlier this year, I built a 7&#8242; rocket to obtain L1 and L2 certifications from the National Rocketry Association. I flew it twice to earn my certifications, and since then I have flown it four more times to test various other systems including a <a href=\"http:\/\/andrewgoering.com\/?p=72\" data-type=\"URL\" data-id=\"http:\/\/andrewgoering.com\/?p=72\">reefed parachute and circumferential disreefing mechanism<\/a>,  a custom flight control board, and a payload interface system. It remains in good condition and ready to launch.<\/p>\n\n\n\n<iframe loading=\"lazy\" src=\"https:\/\/drive.google.com\/file\/d\/1Z0i8DTlt64vCohObXHKP6D4CqWkY36cF\/preview\" width=\"640\" height=\"360\"><\/iframe>\n\n\n\n<p>I built the rocket from scratch and developed a new system to mount the fins and the motor tube. Removable \u00bc\u201d plywood fins are clamped between two \u00bd\u201d plywood centering rings. Three steel \u00bc&#8221;-20 threaded rods with jam nuts provide the clamping force. A 38 mm fiberglass motor tube is epoxied to a \u00bd\u201d plywood thrust plate and a \u00bd\u201d plywood centering boss. All plywood is laser-cut. <\/p>\n\n\n\n<figure class=\"wp-block-image size-medium\"><img decoding=\"async\" loading=\"lazy\" width=\"225\" height=\"300\" src=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCan-225x300.jpg\" alt=\"\" class=\"wp-image-233\" srcset=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCan-225x300.jpg 225w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCan.jpg 742w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><figcaption class=\"wp-element-caption\">Removable Fin Can<\/figcaption><\/figure>\n\n\n\n<p>After the fins are installed, the motor tube is pushed up through the centering rings and the thrust plate is secured with nuts onto the threaded rods. The threaded rods do not take the load from the motor; they only serve to keep the thrust plate from falling out the back of the rocket during descent. The thrust is transferred directly from the motor tube to the thrust plate to the bottom of the body tube.<\/p>\n\n\n\n<div class=\"is-layout-flow wp-block-group\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-image size-medium\"><img decoding=\"async\" loading=\"lazy\" width=\"294\" height=\"300\" src=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCanDiagram-294x300.png\" alt=\"\" class=\"wp-image-232\" srcset=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCanDiagram-294x300.png 294w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCanDiagram-768x784.png 768w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/02\/SpruceGooseFinCanDiagram.png 982w\" sizes=\"(max-width: 294px) 100vw, 294px\" \/><figcaption class=\"wp-element-caption\">Motor Section Assembly<\/figcaption><\/figure>\n\n\n\n<p>The vehicle is equipped with redundant flight computers and separation charges. It has two parachute\/payload bays and is capable of carrying a 15&#8243; payload of over 2.5 kg (although a large payload requires that the fins be replaced, which is why they are removable).  In total, the rocket is 83&#8243; long and has a stability margin of 2.2 calibers without a payload.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"768\" height=\"1024\" src=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-768x1024.jpg\" alt=\"\" class=\"wp-image-306\" srcset=\"http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-768x1024.jpg 768w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-225x300.jpg 225w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-1152x1536.jpg 1152w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-1536x2048.jpg 1536w, http:\/\/andrewgoering.com\/wp-content\/uploads\/2021\/10\/2021-03-12-21.31.38-scaled.jpg 1920w\" sizes=\"(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><figcaption class=\"wp-element-caption\">Assembled Vehicle<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Earlier this year, I built a 7&#8242; rocket to obtain L1 and L2 certifications from the National Rocketry Association. I flew it twice to earn my certifications, and since then I have flown it four more times to test various other systems including a reefed parachute and circumferential disreefing mechanism, a custom flight control board, &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/andrewgoering.com\/?p=225\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Certification and Payload Test Rocket&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":227,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/posts\/225"}],"collection":[{"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=225"}],"version-history":[{"count":28,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/posts\/225\/revisions"}],"predecessor-version":[{"id":381,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/posts\/225\/revisions\/381"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=\/wp\/v2\/media\/227"}],"wp:attachment":[{"href":"http:\/\/andrewgoering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=225"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=225"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/andrewgoering.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}