{"id":235,"date":"2016-03-22T22:36:47","date_gmt":"2016-03-22T12:36:47","guid":{"rendered":"http:\/\/leederville.net\/rocket\/?p=235"},"modified":"2016-03-22T22:36:47","modified_gmt":"2016-03-22T12:36:47","slug":"first-launch-of-jaji-rocket","status":"publish","type":"post","link":"https:\/\/leederville.net\/rocket\/index.php\/2016\/03\/22\/first-launch-of-jaji-rocket\/","title":{"rendered":"First launch of JAJI Rocket"},"content":{"rendered":"<p>A launch of the JAJI rocket was done on the 1stof November 2015 at the mud-flats situated approximately mid-way between Palm Cove and Port Douglas.<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_243\" aria-describedby=\"caption-attachment-243\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/launch_location.png\"><img loading=\"lazy\" class=\"size-medium wp-image-243\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/launch_location-300x172.png\" alt=\"Launch location\" width=\"300\" height=\"172\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/launch_location-300x172.png 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/launch_location.png 627w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-243\" class=\"wp-caption-text\">Launch location<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>It was an extremely hot day to launch the rocket. I had to walk about 8km in total to get all the equipment out to the launch area. I got a lot of blisters. I will definitely be trying to work out a better way to get the launch site setup next time.<\/p>\n<p>Eventually we got everything setup, but then had some issues with the GroundStation Electronics. The groundstation.pl process kept finding non-ascii characters and crashing. As a result we almost didn&#8217;t get to launch the rocket. We managed to get through all the stages of the launch sequence by restarting the Groundstation between each step.<\/p>\n<p>We have since discovered the cause of the Groundstation issue. It was due to overflow of the Serial Buffers. We&#8217;d lose some data and we&#8217;d get &#8216;pieces&#8217; of data. This totally confused the groundstation perl script and crashed it. One improvement that we are looking at implementing is a re-start on crash script. Other improvements include ensuring Serial Buffers cannot be overflowed.<\/p>\n<p>The engine we used was a HP110-G250VM-14A and the rocket we used was &#8216;JAJI AEROSPACE&#8217;, a Callisto rocket. We used OpenRocket to predict the speed and altitude. These are below.<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_247\" aria-describedby=\"caption-attachment-247\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation.png\"><img loading=\"lazy\" class=\"wp-image-247 size-medium\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation-300x144.png\" alt=\"OpenRocket_Launch_Simulation\" width=\"300\" height=\"144\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation-300x144.png 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation-1024x492.png 1024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation.png 1337w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-247\" class=\"wp-caption-text\">Graph of altitude, velocity and acceleration<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_248\" aria-describedby=\"caption-attachment-248\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation_summary.png\"><img loading=\"lazy\" class=\"size-medium wp-image-248\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation_summary-300x59.png\" alt=\"Summary information\" width=\"300\" height=\"59\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation_summary-300x59.png 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation_summary-1024x202.png 1024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/OpenRocket_Launch_Simulation_summary.png 1233w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-248\" class=\"wp-caption-text\">Summary information<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>A video of the launch is below.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/-3cdHVWxjl4?feature=oembed\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>Below is a picture of the landing.<\/p>\n<figure id=\"attachment_215\" aria-describedby=\"caption-attachment-215\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2015\/11\/SMALL_IMG_2436.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-215\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2015\/11\/SMALL_IMG_2436-300x225.jpg\" alt=\"Rocket Landing site - Notice the imprint of the motor in mud\" width=\"300\" height=\"225\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2015\/11\/SMALL_IMG_2436-300x225.jpg 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2015\/11\/SMALL_IMG_2436.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-215\" class=\"wp-caption-text\">Rocket Landing site &#8211; Notice the imprint of the motor in mud<\/figcaption><\/figure>\n<p>The piston was slightly damaged by the shock cord. See a picture of this damage below.<\/p>\n<figure id=\"attachment_245\" aria-describedby=\"caption-attachment-245\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/IMG_6229.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-245\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/IMG_6229-300x300.jpg\" alt=\"Damaged Piston Tube\" width=\"300\" height=\"300\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/IMG_6229-300x300.jpg 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/IMG_6229-150x150.jpg 150w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2016\/03\/IMG_6229-1024x1024.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-245\" class=\"wp-caption-text\">Damaged Piston Tube<\/figcaption><\/figure>\n<p>This damage is minor. It was repaired using some areldite and masking tape. Then it was sanded down so it could easily slide up and down inside the airframe.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A launch of the JAJI rocket was done on the 1stof November 2015 at the mud-flats situated approximately mid-way between Palm Cove and Port Douglas. &nbsp; &nbsp; It was an extremely hot day to launch the rocket. I had to walk about 8km in total to get all the equipment out to the launch area. &hellip; <a href=\"https:\/\/leederville.net\/rocket\/index.php\/2016\/03\/22\/first-launch-of-jaji-rocket\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">First launch of JAJI Rocket<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/235"}],"collection":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/comments?post=235"}],"version-history":[{"count":6,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/235\/revisions"}],"predecessor-version":[{"id":250,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/235\/revisions\/250"}],"wp:attachment":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/media?parent=235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/categories?post=235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/tags?post=235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}