{"id":175,"date":"2010-10-25T08:28:37","date_gmt":"2010-10-25T12:28:37","guid":{"rendered":"http:\/\/glennpaulley.ca\/curling\/?p=175"},"modified":"2024-02-11T15:07:48","modified_gmt":"2024-02-11T20:07:48","slug":"how-many-rotations","status":"publish","type":"post","link":"https:\/\/glennpaulley.ca\/curling\/2010\/10\/25\/how-many-rotations\/","title":{"rendered":"How many rotations?"},"content":{"rendered":"<p>Just how many times should a curling stone rotate as it moves down the ice?<\/p>\n<p>Ideally, during a delivery a stone travels &#8211; initially &#8211; down the line of delivery towards the target, with a rotation applied by the wrist just prior to the release. On a draw shot, when the stone reaches the other end of the sheet, both its forward travel and its rotation cease simultaneously. <\/p>\n<p>In the most recent OCA Blue Challenge booklet for junior curlers, Challenge #2 (Consistent rotations) calls for:<\/p>\n<ul>\n<li>The curler is to deliver 6 draw stones with 2 to 4 rotations.<\/li>\n<li>Little Rock curlers may have 2 to 5 rotations.<\/li>\n<\/ul>\n<p>While at the <a href=\"http:\/\/www.teamglennhoward.com\">Team Glenn Howard<\/a> fantasy camp in early October I asked lead Craig Savill about his experience with stone rotations. Craig felt that fewer than two rotations was inadequate, particularly on curling club ice where there may be sufficient frost on the ice surface to cause the stone to <em>lose<\/em> its rotation, resulting in an unpredictable path. Conversely, in Craig&#8217;s experience more than three rotations was too much &#8211; three or more rotations cause the rock to run straighter. Craig&#8217;s views dovetail exactly with the views of former National Training Centre coach Bill Tschirhart, who in his latest book [1] writes:<\/p>\n<blockquote><p>\nA stone that rotates less than 2 rotations is unpredictable. It may curl. It may not curl. If it does curl it may not curl the amount expected. It may slide. It may &#8220;dig in&#8221;. Well, you get the picture I&#8217;m trying to paint I&#8217;m sure. On the other hand, a stone that rotates more than three rotations tends to run straighter than normal (sometimes a desirable situation). But a stone that rotates about 2.5 rotations will &#8220;perform&#8221; according to the manufacturers&#8217; specifications. It will &#8220;finish&#8221;.\n<\/p><\/blockquote>\n<p>Our goal, then, should be to deliver <strong>granite<\/strong> stones with 2.5 rotations. To satisfy the Blue Challenge, junior curlers are given more leeway: 2-4 rotations (2-5 for younger curlers throwing Lite Rocks). What I don&#8217;t know &#8211; but I will try to find out &#8211; is what the optimal number of rotations is for a Lite Rock stone. In my experience at Elmira, two rotations with a Lite Rock stone seems too few, but I don&#8217;t know what the &#8220;best&#8221; number is.<\/p>\n<p>[1] Bill Tschirhart (2010). A Pane in the Glass: A Coach&#8217;s Companion. Corporate Imaging Centre, London, Ontario. ISBN 978-0-9866513-0-4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Just how many times should a curling stone rotate as it moves down the ice? Ideally, during a delivery a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ngg_post_thumbnail":0,"footnotes":""},"categories":[388,4],"tags":[39,40],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-delivery","category-technique","tag-little-rock","tag-stone-rotations"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How many rotations? - Throwing Rocks<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/glennpaulley.ca\/curling\/2010\/10\/25\/how-many-rotations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How many rotations? - Throwing Rocks\" \/>\n<meta property=\"og:description\" content=\"Just how many times should a curling stone rotate as it moves down the ice? 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Brushing specialist. Coach of Team Mackenzie Kiemele (U25 women) and Team Kiemele\/Singer (mixed doubles). University of Waterloo and University of Manitoba alumnus. President, Elmira &amp; District Curling Club.","sameAs":["http:\/\/glennpaulley.ca","https:\/\/www.linkedin.com\/in\/glennpaulley","https:\/\/x.com\/gpaulley"],"url":"https:\/\/glennpaulley.ca\/curling\/author\/glennpaulley\/"}]}},"_links":{"self":[{"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/posts\/175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/comments?post=175"}],"version-history":[{"count":6,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/posts\/175\/revisions"}],"predecessor-version":[{"id":181,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/posts\/175\/revisions\/181"}],"wp:attachment":[{"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/media?parent=175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/categories?post=175"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/glennpaulley.ca\/curling\/wp-json\/wp\/v2\/tags?post=175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}