Coast Down Formula

[landracing]

Here is a forumula to figure out a Coeficient of Drag number. It is called the coast down method, if you are not lucky enough to have wind tunnel data then this is a way to get a "General" number with some thinking behind it, instead of shooting in the dark on a number.

Jon

http://www.landracing.com/formula/coastdown.htm

[stay`tee]

Have just taken my Kawasaki ZRX1200 out and done a cuppla test runs to get  data ie, coast down time,,, the first two passes were spent getting  cordination right, three further passes netted 22 seconds to coast down from 100mph to 50mph,, put this time along with current weather information into the forumla provided and it tells me 1.774 cod,, the bike is my daily ride and the test was done in  street trim, diddent have a tight tuck, just crouched over,,,,, hope this information helps somewon

[stay`tee]

i wish to acess this formula again but it is coming up with a "404 error, page not found", message,, Mister Admin is it possible to reactivate this formula ?

[Seldom Seen Slim]

Would that be one of Sumner's pages?

[stay`tee]

i dont see any reference to Sumner,, introduced by Jon (you i believe  ), the first post on this page contains a link, that when clicked on shows a 404 error,,

[Stainless1]

Actually by Jon Amo a millennium ago...
try here
https://www.torqsoft.net/coastdown.html

[stay`tee]

Jon Amo, arhhh sooo  ,,

"Thankyou Sir" for the link, unfortunatly thay require AU$40.00 to supply me with one calculation  ,,

[Stainless1]

well they let me enter some values, didn't go farther....try
https://www.race-technology.com/wiki/index.php/RTAnalysisConfiguration/Aerodynamics