RE: How fast can you go with your F161?
There is a place - www.gps-speedsurfing.com
Have a look at the Formula speed rankings - http://www.gps-speedsurfing.com/gps.asp?mnu=rankings&smnu=formula&val=&uid=
Rankings are best on the average of 5 off 10 second runs.
In the top 10 speeds there are only 2 Starboard Formula boards, a 159 and 160 (no 161s). F2 are strongly represented - not sure if this means their top speed in moderate winds (flat water) is better or whether they are just very popular in Holland where the majority of subscribers are based.