Go to the IMAC page http://www.mini-iac.com/DesktopDefault.aspx?tabid=90

1st one down "IMAC Flying and Judging Guidelines" and go to page 31 and start reading. It is a very good explaination of how to perform the snap/spin maneouver. This is also the document that the judges are supposed to be using as a guideline for judging criteria. So, if you perform it the way the manual say's and can explain it as such, you should do well.

You may download and print this document. Very helpful to read and know these rules IMO.