Enhance the Flow…
HRD-KORE Fins
surfer: Lance Carleton photo: 18seconds/Andy Morris
WTF Series
The WTF range currently consists of just this single template, but it is something else. Therefore, it is tough to classify this fin as an unusual and unbelievable performer.
Don't let the look of the fin throw you off. A lot is going on with this fin, and it delivers big time. The most concise description for this fin is that it represents a super canard-style fin. The fin is not just a simple vertical fin. Its profile has two distinct breaks: the central blade area flipped out by 7º and the trailing tip extension at 25º. This fin must be seen to believe what is happening with the shape.
It is most commonly used with a more upright back fin, larger than this fin. The WTF serves as the transitional fin in a reverse quad setup where it initiates turns and then transitions the turn onto the back fin. This fin works in an extensive range of conditions and wave heights. It has been tested in everything from 3' to 25' faces and works through the whole range.
WTF Series Details
WTF-425 TWIN
The only fin in this series that serves as the front fin for a QUAD setup, typically in combination with the XTC fins, but it could be used with other similar fins. Under certain circumstances, it could be used as a back fin, but that is not the intended usage model for this design.
DIMENSIONS
height: 4.25" [108mm]
base: 2.875" [73mm]
area: 10.41 in² [67.16 cm²]
MSRP: US$60.00
SALE: US$40.00
Price includes fin bag and key
Set of two fins
SKU: HRD-WTF-425-TWIN
COMBOS
WTF Fin Combinations
Given the fact that there is only the single template in this series it is most often used in combination with the XTC fins.
See the XTC combos for uses of this fin design.
XTC Series
The XTC range currently consists of two side fin sizes and one center. The two side fins shown here and the center fin have been the most heavily used and tested. These fins are also commonly used with the WTF.
The primary driving force behind these fins is to deliver a design that behaves more like a wing than your typical "dolphin fin" style surfboard fin. The motivation for this design all started from the design of a tail wing for a foil board.
Like many modern wings, this design features a tip extension to enhance the performance of the fin. This extension is flipped 16º to the outside and has a slight hollow foil on the inside face. The body of the fin also features a strong hollow foil. These fins are very efficient and fast, with a ton of drive. They also have the uncanny ability to help the board move through dead spots on the wave.
Due to their upright nature, they turn exceptionally well without losing speed through the turns. The tips play a crucial role in turning as they allow for the fin's transition during a turn. As the board is placed further on its rail, the tip of the fin becomes more vertical in the water, allowing it to create a pivot point. Hard to describe, but something that can be easily felt when using the fins.
Two combinations can be created for thrusters: the XTC-413 / XTC-450C for a smaller, looser setup and the XTC-500 / XTC-450C combo for a lot more drive and hold. Due to the shape of the center fin, it has a lot of hold when positioned further forward while still providing excellent turning ability due to the more upright nature of the body of the fin.
These fins have been ridden in boards ranging from small fishes and kneeboards through guns to tow boards. They have successfully surfed in everything from 3' slop to 40' faces. They work!
XTC Series Details
XTC-413 TWIN
Designed primarily as the back fin for an XTC QUAD set, or a front fin in an XTC REVERSE quad, it is also used as a side fin for smaller thrusters setups. It also serves as a side bite in a 2PLUS1 setup.
DIMENSIONS
height: 4.125" [105mm]
base: 2.875" [73mm]
area: 8.91 in² [57.48 cm²]
MSRP: US$60.00
Price includes fin bag and key
Set of two fins
SKU: HRD-XTC-413-TWIN
XTC-500 TWIN
Primary fin design for this series, serving as the larger fin in a QUAD setup and the side fin in a THRUSTER setup. Features FLIP TIP technology and a more wing-like outline for lift and speed.
DIMENSIONS
height: 5.00" [1272mm]
base: 2.875" [73mm]
area: 11.73 in² [75.68 cm²
MSRP: US$60.00
Price includes fin bag and key
Set of two fins
SKU: HRD-XTC-500-TWIN
XTC-450C Center
This is the dedicated center fin for this series, and It can be used in combo with either the XTC-500 or XTC-413. It features a more extended tip for additional hold and drive.
DIMENSIONS
height: 4.50" [114mm]
base: 2.875" [73mm]
area: 10.75 in2 [69.35 cm2]
MSRP: US$30.00
Price does not include a fin bag
Single fin
SKU: HRD-XTC-450C-CTR
COMBOS
XTC Fin Combinations
Given the limited sizes for the fins in this series, the following combinations are possible.
Additional combinations can be created by mixing them with other fins, some of which are also shown here.
DS Series
The DS series currently consists of just this single template, it looks like a variant on a hatchet fin, but a lot is going on with this fin that is not apparent when viewing It from the side.
This design delivers a lot of drive and speed from a small package. It is only 4" tall, but due to the raked-back shape, it has a lot of pop-out turns and exceptional holding power.
The unique thing about this design is that the entire upper blade is flipped outboard by 6º, and both the bottom portion of the fin and the upper blade have hollow foils. These features make this fin incredibly fast and effortless through turns.
Flipping the upper portion of the blade will gain a couple of critical performance enhancements. Firstly, it helps the fin transition through a turn making the turns feel more fluid. Secondly, as the board transitions onto the rail, the upper blade becomes more vertical in the water, dramatically enhancing the fin's feel in a turn. Essentially it makes it much easier to push off the fin in a turn. When coupled with the flex in the fin, there is a lot of pop out of turn, such as a small fin.
The speed of this fin comes from the fact that it has a very low wetted surface, so this reduction in drag helps it go through the water a lot faster. Plus, the hollow inside foils also greatly enhance the water flow over the fin, enhancing the speed.
Surprisingly, as small as this fin is, it works incredibly well as the side fin in a thruster setup, primarily due to the shape. This fin rocks in a thruster setup on shortboards when coupled with the XTC-450C center fin. It is also suitable as a side bit in a 2PLUS1 design.
DS Series Details
DS-400 TWIN
The only fin in this series that serves as the front or back fin for a QUAD setup, typically in combination with the XTC fins. Under certain circumstances, it could be used as a rear fin, but that is not the intended usage model for this design.
DIMENSIONS
height: 4.25" [108mm]
base: 2.875" [73mm]
area: 10.41 in² [67.16 cm²]
MSRP: US$60.00
SALE: US$40.00
Price includes fin bag and key
Set of two fins
SKU: HRD-DS-400-TWIN
COMBOS
DS Fin Combinations
There are no specific combos for this template. See the XTC combos to see how they are used with those fins.
These also make great side fins in a 2PLUS1 setup.
XPD2 Series
The XPD2 series is a highly functional family with different size combinations depending on the conditions and needs.
These fins are ideal for quad setups as they have good turning ability, plenty of drive, and speed. Being an unmatched set, the fins can easily be switched around as conditions warrant. They work equally well as thrusters with the dedicated center fin.
These fins feature our custom hollow foil technology on the inner face, making for a faster and more responsive fin! The unique outline narrows the base for good turning, while the increased tip area provides lots of drive. The tips of the fins also feature increased toe-in to help with turning.
These are our go-to fins for a wide range of boards and conditions. They have been successfully deployed on everything from 6-0 shortboards to 10-5 guns!
XPD2 Series Details
XPD2-425 TWIN
This new template is now the smallest fin in this series. Intended for use as the back fin in a QUAD, the front fin in a TWINZER, or as an ideal side bite for a 2PLUS1 setup.
DIMENSIONS
height: 4.00" [102mm]
base: 2.875" [73mm]
area: 9.61 in² [62 cm²]
MSRP: US$60.00
Price includes fin bag and key
Set of two fins
SKU: HRD-XPD2-426-TWIN
XPD2-500 TWIN
The primary fin in this series is used as the front fin for a QUAD setup and the back fin in a reverse QUAD. Also, a side fin in a thruster with the XPD2-438C center fins.
DIMENSIONS
height: 5.00" [127mm]
base: 2.875" [73mm]
area: 14.98 in² [96.64 cm²]
MSRP: US$60.00
Price includes fin bag and key
Set of two fins
SKU: HRD-XPD2-500-TWIN
XPD2-438C Center
The dedicated center fin design for this series. Features increased tip area for drive and hold. These days this fin has largely been replaced by the A4C-500CK fin in a thruster setup.
DIMENSIONS
height: 4.375" [112mm]
base: 2.70" [68mm]
area: 12.39 in² [79.94 cm²]
MSRP: US$30.00
Price does not include a fin bag
Single fin
SKU: HRD-XPD2-438C-CTR
COMBOS
XPD2 Fin Combinations
Given the various sizes for the fins in this series the following combinations are possible.
Additional combinations can also be created by mixing them with other fins, some of which are also shown here.
Advanced fin designs to take your surfing to the next level.
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