Being able to ADJUST the boards ride attitude to best suite the days Surf conditions ....is ultimately what one would want. -
as with modern performance surfboards
There are days when the surf is near perfect...glassy.. with a light breeze - and - there are those days when the surf is big, bumpy.. with howling wind...
....some days you want the nose up - some days you need to keep the nose down...
...some days you want it tight - some days you want it lose....You want Variables'...quick - easy - effective...
Been scratching my ass for a while - been trying a number of 'things'from weight distribution to adjustable tabs - all have had an effect to a degree - but - not ideal or totally impractical.
More recently... I have come up with further variable design aspects in manufacturing the Bi-Fin - hopefully adding further value to the days surfing experience....
IMO and from extensive experience and testing - the Bi-Fin is the ideal fin for rc Surfing:
The Bi -Fin effectively has two fins - both having an outward camber (as with actual twin / tri surf board fins) this certainly holds better in the wave face and producers more drive - surfing left and right - The outward fin camber seems to hold the boards inside rail, deeper into the wave and it displays far more stability when running around in the surf. when compared to running a single fin. The positive foil (wing-let) on the left fin tip helps to counter the props rotational torque and balances the turns out - making for a balanced feel in the steering. Having no disruption in front of the prop (as a single fin would be) allows for a clean thrust line,which adds to acceleration / speed / effeciency.
The Standard Bi-Fin
which I have been surfing for ages - has a neutral / parallel fin setting - i.e. no noticeable effect on the boards actual ride angle of attack. Proven to be a great all round fin in most all conditions. Great for the average day - 4ft-6ft faces - moderate breeze - good clean pealing waves....
The Toe- In.. Bi-Fin
has the fins toeing In, going forward.. as with most surf board fins ....this has the effect of pulling the tail deeper into the water - lifting the nose up - making for a loser board - which is great to surf in the tighter - hollower - waves....less pearling in the pocket..
..especially on the very hollow, pealing waves or the smaller waves.....2ft - 3ft face..
The Toe-Out Bi-Fi
has the fins toeing outward going forward...has the effect of lifting the tail and pushing the nose down to a degree - placing more board in the water - great for those very windy days, when the wind tends to get under the board - the faster you go, the more board is in the water, where as, with a neutral or toe- in fin, the wind will more than likely get under the board and 'flip it'. Also great for surfing the bigger face waves - carving bigger arc's - more of the inside rail is placed in the water- wider - more powerful turns..
I'll look to demonstrate the various fin effects on a flat water video in the near future...
...and share fin selection in future video's..