FCS and Warp Drive Bonzer fins compared

A visual comparison of the foil sections:

Solidworks CAD showing the WD Bonzer fin, with sacrificial tabs ready for 3d printing

                                     

FCS bonzer fins reputedly developed by the Campbell brothers

Microgrooved Warp Drive bonzer fin for Futures boxes

Red lines are the MH32 foil (developed late 90's) with a 'hollow' ( i.e. concave) trailing edge and soft leading edge.

Aargh. FCS's Flat inside foil with sharp leading edges. 

Flat inside foils with sharp leading edges are a menace in terms of drag and were debunked as a useful foil in German wind tunnels in 1919. check out more on flat foils here.

Some people are vehement about defending their antiquated understanding:  The industry flat foils as explained by Shawd.

Get some Bonzer fins here