Here is the prop slip calculator (spider stole from the bullet board like a good pirate )
http://www.go-fast.com/Prop_Slip_Calculator.htm
And here are some Video links
Pauls's video
Tims video
http://home.comcast.net/~corywurst/jasper05.wmv 05 Jasper Cory Wurst
06 Jasper
07 Jasper
New helment cam video