{"id":23,"date":"2007-01-18T16:02:32","date_gmt":"2007-01-18T16:02:32","guid":{"rendered":"http:\/\/www.jpyro.com\/wp\/?p=23"},"modified":"2014-03-13T15:43:35","modified_gmt":"2014-03-13T15:43:35","slug":"a-prediction-of-aerial-shell-and-comet-trajectories-using-shellcalc%c2%a9","status":"publish","type":"post","link":"https:\/\/www.jpyro.co.uk\/?p=23","title":{"rendered":"A Prediction of Aerial Shell and Comet Trajectories Using SHELLCALC\u00a9"},"content":{"rendered":"<p><strong><em>John Harradine and Tom Smith<\/em><\/strong><\/p>\n<p><strong>Abstract:<\/strong> This paper describes a model for predicting the path of aerial shells and Roman candle comets. This model, incorporated in a Microsoft\u00ae Excel-based freeware program, SHELLCALC<sup>\u00a9<\/sup>, predicts the trajectoryof these fireworks using point mass equations for range and height. These equations are modifi ed to take into consideration mortar\/candle angle, launch altitude above sea level, wind speed and direction, comet consumption, air density and terrain, and incorporate an approximation of shell drift through tumbling motion and mortar balloting. The graphical output from the model also\u00a0incorporates typical shell burst diameters.<\/p>\n<p><strong>Keywords:<\/strong> Shells, comets, ballistics, trajectory, fall-ou<span style=\"font-family: TimesNewRomanPS-ItalicMT;\"><span style=\"font-family: TimesNewRomanPS-BoldMT;\">t<\/span><\/span><\/p>\n<p><strong>NOTE<\/strong> &#8211; A new version of the Shellcalc\u00a9\u00a0program is now available at a dedicated website &#8211; please <a href=\"http:\/\/www.shellcalc.co.uk\" target=\"_blank\">click here<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>Ref: JPyro, Issue 22, 2005,\u00a0pp9-15<br \/>\n(J22_9)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>John Harradine and Tom Smith Abstract: This paper describes a model for predicting the path of aerial shells and Roman candle comets. This model, incorporated in a Microsoft\u00ae Excel-based freeware program, SHELLCALC\u00a9, predicts the trajectoryof these fireworks using point mass equations for range and height. These equations are modifi ed to take into consideration mortar\/candle &hellip;<br \/><a href=\"https:\/\/www.jpyro.co.uk\/?p=23\" class=\"more-link pen_button pen_element_default pen_icon_arrow_double\">Continue reading <span class=\"screen-reader-text\">A Prediction of Aerial Shell and Comet Trajectories Using SHELLCALC\u00a9<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2,29,21],"tags":[],"_links":{"self":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/23"}],"collection":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":10,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"predecessor-version":[{"id":1654,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions\/1654"}],"wp:attachment":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}