Hey Bearcave !... The most boring question ever asked .............is the question 'never asked'......... Henry Ford never claimed to know all things - instead - shared that his success was because he better knew what questions to ask the folk around him.......IMO - The late Steve Jobs had a similar approach............as my 3 year old Cassidy sais when I ask her a question......Google it Dad !........LOL- We are so fortunate to live in a era with 'so much' information at our fingertips ( excuse the pun) ....

The Bi-Fin.....definitely misunderstood and underrated......

The pivot point on a Bi-Fin in 'pretty close' to center of its width - which also eliminates the damaging 'impact' usually caused due to the unbalanced ' face leverage' a single fin would have, with its pivot point forward by at least 3/4' 's of the single fins width.
With a single fin - landing a big jump with the fin slightly skew - or slapping the board on its side after a kick out or a re-entry - endures a huge impact on the face of the single fin, which is transferred 'straight back' to the servo gearbox - With the Bi-Fin - their is close to 'zero' impact being transferred back. .....so - that combined with the effortless geometry of its 'steering, requiring very little torque to steer it.......its an awesome fin arrangement.......which I prefer way over a single fins performance.

The only point of force, when actuating a turn, would be acting on the outside face of the one fin and on the inside face of the opposite fin, ( this generates the lean and digs the tail in) the force increasing toward the end of the fin due to the leverage - that will bear a load on the pivot pin and pivot pin housing in the vertical plane, so you need to ensure that the pivot pin housing is well secured into the board......as with the single fin....

I flare the bottom end of the brass pivot pin housing tube, before fitting it, so that when I epoxy it into the board, it creates a healthy ring of epoxy at the lower end of the tube, increasing the bonded strength substantially. On the top side, I pre - countersink the housing hole - then - when the brass tube protrudes - I flow epoxy around it - once cured - trim the tube down, resulting in a strong circumferential bond at the top end as well.......This system has stood up to some serious hammering so far......


Ill make a photo sequence as I make up one for the board I am currently building and post the pics ! its as easy as abc........123............LOL



Bro ********. ...
Share the STOKE !