{"id":1415,"date":"2018-10-27T21:41:21","date_gmt":"2018-10-27T11:41:21","guid":{"rendered":"http:\/\/leederville.net\/rocket\/?p=1415"},"modified":"2018-10-28T20:43:10","modified_gmt":"2018-10-28T10:43:10","slug":"testing-the-igniters","status":"publish","type":"post","link":"https:\/\/leederville.net\/rocket\/index.php\/2018\/10\/27\/testing-the-igniters\/","title":{"rendered":"Testing the Igniters"},"content":{"rendered":"<h2>What I wanted to test<\/h2>\n<p>I am\u00a0using a Pico AA2 Altimeter and I wanted to run a few tests:-<\/p>\n<ol>\n<li>Test that\u00a0the Altimeter seems to work &#8211; i.e. will detect launch and can detect Burnout and then Apogee. I do this test because I wouldn&#8217;t want to fly with a faulty Altimeter<\/li>\n<li>Test that the Altimeter with the 2 x 3.7v 180maH LiPO batteries can supply the current required to fire two e-Matches one after the other<\/li>\n<li>Test the Cable Cutter and the procedure to set it up.<\/li>\n<\/ol>\n<p><iframe loading=\"lazy\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/tb5ZAfk-0pc?feature=oembed\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen><\/iframe><\/p>\n<h2>The Set-up<\/h2>\n<p>Here are photos taken during the set-up.<\/p>\n<figure id=\"attachment_1425\" aria-describedby=\"caption-attachment-1425\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6616-e1540640258394.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1425\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6616-e1540640258394.jpg\" alt=\"Igniter already threaded through cable cutter closure.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6616-e1540640258394.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6616-e1540640258394-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6616-e1540640258394-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1425\" class=\"wp-caption-text\">Igniter already threaded through cable cutter closure.<\/figcaption><\/figure>\n<figure id=\"attachment_1426\" aria-describedby=\"caption-attachment-1426\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6619-e1540640244826.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1426\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6619-e1540640244826.jpg\" alt=\"Tape put around the igniter, to reduce chance of shorting against the Cable Cutter case.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6619-e1540640244826.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6619-e1540640244826-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6619-e1540640244826-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1426\" class=\"wp-caption-text\">Tape put around the igniter, to reduce chance of shorting against the Cable Cutter case.<\/figcaption><\/figure>\n<figure id=\"attachment_1428\" aria-describedby=\"caption-attachment-1428\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6621-e1540640141159.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1428\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6621-e1540640141159.jpg\" alt=\"Hot Glue to keep the black powder in.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6621-e1540640141159.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6621-e1540640141159-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6621-e1540640141159-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1428\" class=\"wp-caption-text\">Hot Glue to keep the black powder in.<\/figcaption><\/figure>\n<figure id=\"attachment_1429\" aria-describedby=\"caption-attachment-1429\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6623-e1540640220768.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1429\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6623-e1540640220768.jpg\" alt=\"All the igniters connected.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6623-e1540640220768.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6623-e1540640220768-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6623-e1540640220768-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1429\" class=\"wp-caption-text\">All the igniters connected.<\/figcaption><\/figure>\n<figure id=\"attachment_1427\" aria-describedby=\"caption-attachment-1427\" style=\"width: 4032px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1427\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620.jpg\" alt=\"Everything connected.\" width=\"4032\" height=\"3024\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620.jpg 4032w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620-300x225.jpg 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620-768x576.jpg 768w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6620-1024x768.jpg 1024w\" sizes=\"(max-width: 4032px) 100vw, 4032px\" \/><\/a><figcaption id=\"caption-attachment-1427\" class=\"wp-caption-text\">Everything connected.<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h2>The Results<\/h2>\n<p>Here are the results<\/p>\n<h3>Detection of Launch Events<\/h3>\n<figure id=\"attachment_1421\" aria-describedby=\"caption-attachment-1421\" style=\"width: 934px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/Launch_Data.png\"><img loading=\"lazy\" class=\"size-full wp-image-1421\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/Launch_Data.png\" alt=\"Data from &quot;test&quot; launch on bench\" width=\"934\" height=\"674\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/Launch_Data.png 934w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/Launch_Data-300x216.png 300w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/Launch_Data-768x554.png 768w\" sizes=\"(max-width: 934px) 100vw, 934px\" \/><\/a><figcaption id=\"caption-attachment-1421\" class=\"wp-caption-text\">Data from &#8220;test&#8221; launch on bench<\/figcaption><\/figure>\n<p>We had the Pico AA2 pointed up while it was configured with 2G = 8 which is equal to about 1\/4g. Because the G&#8217;s are more than 0.25g, the Pico AA2 thinks it has detected launch.<\/p>\n<p>I then turn the Pico so that it is horizontal. As I do this, the G&#8217;s pass through zero, which it takes a motor BurnOut. Then it looks at the area under the curve as the rocket &#8220;deaccelerates&#8221; and when this area is equal to area under curve between Ignition and BurnOut, it then assumes we have lost the velocity we gained; i.e. we are at Apogee. So it fires the Apogee (A) event. Then, because we are below the 800ft, it fires the Main 0.5 seconds later.<\/p>\n<p>&nbsp;<\/p>\n<h3>Apogee<\/h3>\n<p>This will ignite black powder that will separate the top section of the rocket (including the nose cone) from the main air-frame. In this test, we just want to make sure the igniter does it&#8217;s job. Ignites.<\/p>\n<p><iframe loading=\"lazy\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/fKRG8aD7Fck?feature=oembed\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<h3>The Main<\/h3>\n<p>Here we test that Main Output fires.<\/p>\n<p><iframe loading=\"lazy\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/YGUOcVSD-NY?feature=oembed\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" allowfullscreen><\/iframe><\/p>\n<h2>Conclusion<\/h2>\n<p>So I ran this test and I&#8217;m now fairly comfortable that the Pico AA2 works. I also observed both igniters working, which means the Pico AA2 batteries can be depended upon.<\/p>\n<p>However, the Cable Cutter did not fire. I suspect this is because of two things.<\/p>\n<ol>\n<li>The piston is a dud &#8211; it doesn&#8217;t have a &#8220;cutting edge&#8221; like other photos show<\/li>\n<li>A significant portion of the black powder gas went out the back.<\/li>\n<\/ol>\n<p>Here is a photo of the piston.<\/p>\n<figure id=\"attachment_1423\" aria-describedby=\"caption-attachment-1423\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6615-e1540640117104.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1423\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6615-e1540640117104.jpg\" alt=\"This should have a very sharp cutting edge...a concave hole.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6615-e1540640117104.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6615-e1540640117104-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6615-e1540640117104-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1423\" class=\"wp-caption-text\">This should have a very sharp cutting edge&#8230;a concave hole.<\/figcaption><\/figure>\n<figure id=\"attachment_1430\" aria-describedby=\"caption-attachment-1430\" style=\"width: 3024px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6629-e1540640174554.jpg\"><img loading=\"lazy\" class=\"size-full wp-image-1430\" src=\"http:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6629-e1540640174554.jpg\" alt=\"The piston seized up in the cable cutter body. This screw-driver shows how far it was stuck in.\" width=\"3024\" height=\"4032\" srcset=\"https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6629-e1540640174554.jpg 3024w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6629-e1540640174554-225x300.jpg 225w, https:\/\/leederville.net\/rocket\/wp-content\/uploads\/2018\/10\/IMG_6629-e1540640174554-768x1024.jpg 768w\" sizes=\"(max-width: 3024px) 100vw, 3024px\" \/><\/a><figcaption id=\"caption-attachment-1430\" class=\"wp-caption-text\">The piston seized up in the cable cutter body. This screw-driver shows how far it was stuck in.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>What I wanted to test I am\u00a0using a Pico AA2 Altimeter and I wanted to run a few tests:- Test that\u00a0the Altimeter seems to work &#8211; i.e. will detect launch and can detect Burnout and then Apogee. I do this test because I wouldn&#8217;t want to fly with a faulty Altimeter Test that the Altimeter &hellip; <a href=\"https:\/\/leederville.net\/rocket\/index.php\/2018\/10\/27\/testing-the-igniters\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Testing the Igniters<\/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":[21,2,14],"tags":[],"_links":{"self":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1415"}],"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=1415"}],"version-history":[{"count":7,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1415\/revisions"}],"predecessor-version":[{"id":1431,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1415\/revisions\/1431"}],"wp:attachment":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/media?parent=1415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/categories?post=1415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/tags?post=1415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}