I am a bit surprised that I never wrote a article about rake & speedsurfing... So here it is:
Rake is a measurement how much the leading edge of the fin is leaning backwards. Speedsurfing fins are found in different rake inbetween 10 degrees till 30 degrees. In general you can say longer fins have less rake, shorter speedfins have more rake.
In the Netherlands speedsurfing scene Rake became a hot item after Martin van Meurs and Boogie developed the C3 X1 and X2 series. Extreme fast profiles, but required a lot of rake. (fin on picture is a c3 X2 24cm 30 degrees rake)
Why would you need more rake??? There are 2 simple reasons:
- More Rake= less taillift = more control
- De-twist problems, some fins twist the wrong way, by adding more a lot rake the twist turns the right way.
And some difficult reasons:
- More rake is according to this graph allowing more AOA (graph found on Boogie his site). This means underneath a v-bottom a raked fin allow the board to generate more lift....?!? Still I haven't really experienced this fact... I have experienced the tectonics falcon f1 design allowing more AOA...
OK, nice to know this theory but what about us?? What would a normal speedsurfer need?
To all speedsurfers: if you buy a select fin it is possible to order a specific raked fin, this is what I do all the time. Some standard select fins have a bit to less rake for amateurs that are going for high speeds.
For most speedsurfers these rake work the best:
- 21cm=20 degrees
- 23cm=20 degrees
- 25cm=17 degrees
- 27cm=15 degrees
- 29cm=15 degrees
- 31cm=13 degrees
- 33cm=13 degrees
If you would use less rake the fin will produce more taillift and the ride feels more scary (I think the board will pop-out feeling). That is why I recommend most surfers to use some rake. Because control=speed.