DIVINE (DV9) Series Update #1
Testing of the new DV9 designs has been ongoing and very positive. We have also added a new concept to the design - POWER ASSIST!
August 14, 2020
DIVINE (DV9) Series Update #1
We have continued to test the new DV9 series and work on newer sizes in the range. So far, the testing has been overwhelmingly positive and very encouraging.
Much of the recent testing has focused on thruster versions of the series, primarily the DV9-500 template as both the side and the center fin. Due to the small efficient size of these fins, there was a feeling that as the surf got a lot more powerful and bigger even more power would be needed. This would typically necessitate moving to a larger size fin, but we got to thinking that there might be an alternate approach.
So we came up with POWER ASSIST!
The idea was to create a fin that could be used as a back fin that would specifically focus on adding more power to any given front fin. To accomplish this, it needed to add more base area to create the power but simultaneously reduce the area in the tip to mitigate impacting the turning ability of the standard DV9 templates. One of our testers said this setup creates a twin fin on steroids, and that is exactly what we were after. Lots of power and speed without any impact on the turning ability!
The result is the unusual-looking DV9-400PWR fin! It was purposely kept with the least area as possible in the tip, with the area focused in the lower half of the fin. The leading edge is shaped to match up with the DV9 438, 463, and 500 fins trailing edges, to create a sort of split keel effect. The design of the fin has also been optimized to work as a complementary back fin in a normal quad setup. Where it would also serve to enhance the power of the main fin, but unlike a normal quad setup this fin is not going to create as much impact on the turning ability and is going to allow the main fin to still drive through turns. The fin still features our PHAT FOILS and HOLOFOILS on the inside face to further enhance the performance.
In addition to this template, there is a smaller version - DV9-375PWR, for situations where a little less power is needed, or for combination with smaller versions of the primary fin. Plus a larger version for use with larger main fins for even more power - DV9-425PWR.
Looking at a drawing showing this new design with the standard DV9-413 back fin overlaid (dashed outline), you can see how dramatic the difference is between the two setups. It is immediately apparent how much of the area of the standard back fin set is pushed further back, resulting in the center of effort for the setup being further back. While the POWER ASSIST setup results in a much smaller shift in the center of effort, the net result being that the POWER ASSIST setup is going to be much easier to turn, while still providing plenty of power due to the area in the base!
It is worth pointing out that the more upright nature of the POWER ASSIST fin design is going to help the turning ability of the setup.
Finally, looking at how this fin could also be combined with some of our other templates to achieve a similar effect. Firstly, we have paired the DV9-400PWR with the Q2-L as the front fin. The results of this pairing will be different than the DV9 because the Q2 has a lot of rake, so while this will add more power it is also going to add some projection, but overall the setup will be a lot more responsive than the typical Q2 quad setup
Secondly, the same fin is paired with the new K9 keel fin design (more on this fin in a later post). In this setup the PWR fin is being used almost like a nurse fin. By using this fin with a keel fin the size of the keel could be reduced to improve speed without sacrificing any of the other characteristics.
Because the layout of the boxes can be critical to optimizing the use of these fins we have designed it to work perfectly in what we consider to be a standard TWINZER setup.
We have created a fin layout guide specifically geared towards this fin set up that shows the optimal layout of the boxes to achieve the 3/4" (19 mm) of separation shown in the drawing. In the simplest form, the FRONT mark for the BACK boxes need to be 3/4" (19 mm) forward of the BACK mark for the FRONT boxes. The BACK mark for the BACK boxes needs to be 1 1/8" (29 mm) in from the rail. So given a FRONT box placed 12 3/4" from the tail, the BACK boxes would be placed at 9.00" from the tail, for a difference of 3 3/4"! There is also a kneeboard specific version of this TWINZER layout. Use the link below to find these guides on this site.
This new template can also be used with bigger versions of the DV9, see photo, in this case, the DV9-563 is being shown with the PWR fin. When used with a larger fin the twin feel is going to increase so bear this in mind, this is because the larger fin is going to dominate the PWR fin and the center of effort is going to move further forward placing an increased emphasis on the front fin.
NOTE: these new PWR templates are best suited to tightly clustered box placements, anything like a McKee setup is going to be hopelessly ineffective due to the back fins being placed so far back and too far in from the rails!
The photo below shows a rough foiled set of the DV9 POWER ASSIST fins, this one featuring the latest version of the DV9-500 v3, which has a slightly different shape to the cutaway! The other interesting thing about this set of fins is that they are made from a VOLAN panel typically used for flex fins.
SUMMARY: this fin is going to suit certain types of surfers better than others especially those who fancy a more twin fin feel with a lot of power through very tight turns. Some might find it too hard to handle due to the responsiveness. The best way to think of this new design is to think of its name POWER ASSIST, what is does is serve as an assistant to the front fin. If the front fin is very vertical like the DV9 then it is going to be very pivotal. But if it is coupled with a more raked fin like the A4C or Q2 then it is going to add power. So while we are showing it here with the DV9 it is really not strictly limited to being used with that template. Finally, we feel strongly that this new fin design is going to be especially useful on kneeboards and should provide another set of options!
An additional new size has also been added to the general DV9 range in the form of a 6.00" version, that would be ideally suited for a twinzer setup combined with the DV9-350CN canard fin, or for use in a twin fin. Of course it could also be combined with the new PWR templates for even more drive!