Here's some preliminary simulation results
I'm using the drag coefficient of 0.15 as stated by Spen.M.P.
Using the magnus equation from
http://en.wikipedia.org/wiki/Magnus_...all_in_the_air with a lift coefficient of 0.2 (some one could test?)
Though I'm kinda sceptical of the Wikipedia formula....... it seems like the formula is just the drag formula with a lift coefficient....