{"id":17544,"date":"2015-08-23T19:37:23","date_gmt":"2015-08-24T00:37:23","guid":{"rendered":"http:\/\/caddyinfo.com\/wordpress\/?p=17544"},"modified":"2015-08-23T19:37:23","modified_gmt":"2015-08-24T00:37:23","slug":"cadillac-xlr-validating-frontal-area-calculation","status":"publish","type":"post","link":"http:\/\/www.caddyinfo.com\/wordpress\/cadillac-xlr-validating-frontal-area-calculation\/","title":{"rendered":"Cadillac XLR validating frontal area calculation"},"content":{"rendered":"
\"2009<\/a>

2009 Cadillac XLR<\/p><\/div>\n

I did a bit more work on frontal area, which appears to support the short-cut we took earlier.<\/a><\/p>\n

From a thread on Virtual Dyno on HpTuners<\/a>, The quick way to calculate frontal area is (((w*h)(0.85))\/12)\/12 = Frontal Area.<\/p>\n

For the 2007 base XLR<\/a>, W=72.3in,\u00a0 H=50.4in so for a first approximation (((72.3*50.4)*.85)\/12\/12)= 21.5 ft2.<\/p>\n

The question then is the 0.85 factor.\u00a0 To test that, I downloaded a diagram of the 2007 Cadillac XLR from the-blueprints.com<\/a> and pulled just the frontal area into a photo editor.<\/p>\n

\"cadillac-xlr-2007<\/a><\/p>\n

Next, I selected the parts of the diagram that were NOT XLR<\/p>\n

\"xlr<\/a><\/p>\n

Then I used the photo editor (GIMP) to tell me how many pixels were shaded (20,668) of the total pixels size (149,464) which resolves to 20668\/149464 = 13.8%, or 86.2% for the XLR.<\/p>\n

That makes the frontal area for the 2007 base XLR<\/a>, (((72.3*50.4)*.862)\/12\/12)= 21.8 ft2.\u00a0 In this case the approximation was good, but I will update my Virtual Dyno XLR profile to 21.8 ft2.<\/p>\n","protected":false},"excerpt":{"rendered":"

I did a bit more work on frontal area, which appears to support the short-cut we took earlier. From a thread on Virtual Dyno on HpTuners, The quick way to calculate frontal area is (((w*h)(0.85))\/12)\/12 = Frontal Area. For the … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[324,189,251,845,299,300],"tags":[],"class_list":["post-17544","post","type-post","status-publish","format-standard","hentry","category-test-gear","category-test-info","category-trip-report","category-virtual-dyno","category-xlr-cadillac-models","category-xlr-cadillac-models-2"],"_links":{"self":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17544","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/comments?post=17544"}],"version-history":[{"count":2,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17544\/revisions"}],"predecessor-version":[{"id":17548,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17544\/revisions\/17548"}],"wp:attachment":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/media?parent=17544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/categories?post=17544"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/tags?post=17544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}