tag:blogger.com,1999:blog-12831567.post2856607067336125945..comments2024-03-28T08:40:23.164-05:00Comments on Guitar Ted Productions: Friday News And ViewsGuitar Tedhttp://www.blogger.com/profile/10960580677548417562noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-12831567.post-84101324967675689462014-01-05T13:04:32.387-05:002014-01-05T13:04:32.387-05:00I agree the tests are valuable. Just think the con...I agree the tests are valuable. Just think the conclusions are often presented inaccurately.<br /><br />The coast down tests are better for the differences in speed, as that is what is being measured.<br /><br />Wind tunnel tests are about change in resistance at a fixed speed. The raw data shows that, but it is too often presented as a speed change.<br /><br />For the tire tests, the coast down shows real world results. Adding the wind tunnel to this just lets us isolate the aero effect of the tires, but still does not directly show speed change.shiggy personhttps://www.blogger.com/profile/15109478605039343109noreply@blogger.comtag:blogger.com,1999:blog-12831567.post-18253311570577426912014-01-04T13:29:03.837-05:002014-01-04T13:29:03.837-05:00@shiggy person: Either way, it is still very valua...@shiggy person: Either way, it is still very valuable information. On the one hand, it shows that you can work less/more with given changes to a set up at a constant speed, OR it can show that you can (obviously) go faster/slower given a constant workload and changes in set up. <br /><br />Again- I think it all makes sense from a cycling standpoint and gives the reader of the results an option in how to apply said results. Doesn't matter what they are testing for as long as the results can be applied effectively. In this case, I think they can be. (And you also say as much)Guitar Tedhttps://www.blogger.com/profile/10960580677548417562noreply@blogger.comtag:blogger.com,1999:blog-12831567.post-73132148979064898302014-01-04T12:48:30.426-05:002014-01-04T12:48:30.426-05:00I understand what they are trying to say, but that...I understand what they are trying to say, but that is not what they are actually testing.<br /><br />Wind tunnel tests are conducted at a constant speed and show the amount of drag at that speed. Changes in drag show the difference in energy needed to travel at that speed.<br /><br />This is not the same as testing for the speed that can be achieved for a given amount of energy used.<br /><br />So, wind tunnel testing shows if you would be working harder or easier at a given speed, not how much your speed would change for a given effort.<br /><br />The speed is the constant, not the workload.shiggy personhttps://www.blogger.com/profile/15109478605039343109noreply@blogger.comtag:blogger.com,1999:blog-12831567.post-27575761650577996692014-01-03T07:30:38.931-05:002014-01-03T07:30:38.931-05:00@shiggy person: Automobile experts site similar th...@shiggy person: Automobile experts site similar things. Not sure from your comment why it doesn't make sense to you, by the way......Guitar Tedhttps://www.blogger.com/profile/10960580677548417562noreply@blogger.comtag:blogger.com,1999:blog-12831567.post-47937130412963629522014-01-03T01:03:26.632-05:002014-01-03T01:03:26.632-05:00I have to laugh at the conclusions from wind tunne...I have to laugh at the conclusions from wind tunnel testing.<br />"For example, at a very high speed of 40 km/h, decreasing your wind resistance by 1% only adds 0.4% (or 0.14 km/h) to your speed." Or the old "at 40kph X component will cut 30 secs off your 25mi TT time."<br /><br />IME if I am traveling at 40kph my speed does change no matter how much the drag changes because I AM TRAVELING AT 40kph!shiggy personhttps://www.blogger.com/profile/15109478605039343109noreply@blogger.com