The WhisperFin PRO is a significant evolution of the original WhisperFin. The most obvious difference is its unique trailing edge which, combined with other design and material improvements, make the WhisperFin PRO a potent upgrade to your tournament ski’s performance.

Chevrons on Trailing Edge Add Power and Control

WhisperFin PRO reflection

When a water ski’s tail is sliding sideways around a turn, turbulent eddies that form on the low-pressure side at the back of the fin can cause cavitation. Fin cavitation shows up as tail slides, tip-grabs and blowouts while turning at max lean angles. This phenomenon is why all standard fins have holes drilled through them. But these holes create a lot of drag and lose their effectiveness at extreme angles causing the tail to let go when grip is needed most.

Tail-grip that deminishes with increasing angle requires the standard fin to be bigger than ideal, and that it be tuned for our hardest passes. These big-fin setups make turning during easier passes more difficult than necessary, which of course is no problem for pros. Amateurs, on the other hand, struggle to perform well with most of the factory setups recommended by pro skiers. Ideally, the fin should be easy to turn during any pass, and it should retain consistent grip as lean angles get more extreme—for pros and amateurs.

Diagram showing how chevron angles match max roll and smear angles

The patent pending chevrons at the back of the WhisperFin PRO organize the wake behind the fin in ways that minimize cavitation and drag. And by angling the chevrons upward, the more the tail slides the more grip the fin generates, maximizing tail support when you need it most—during high-speed, tight turns caused by the late, narrow preturns of your hardest passes.

This unique trailing edge increases tail-hold so much, the fin can be run .030” to .040” shallower than the original WhisperFin. And this reduced fin area improves turn-initiation at the ball, and reduces tip-rise out of turns.

If none of this makes any sense to you, all you need to know is that this fin maintains the easy-turning quick-accelerating nature of the original WhisperFin, plus adds noticeably more consistency and composure than any other fin when pushed to extremes. The phrase most shared by testers has been, “I can’t believe what I just got away with.”

Upgraded Aluminum Improves Roll Behavior

The less the fin flexes, the more linear tail behavior is while the ski rolls in and out of turns. This is because a soft fin flexes most as it transitions through mid-roll angles, making the ski’s tail “catch” then “snap-release” as the ski rolls up onto its steepest edge where the fin unloads. Then as the ski is rolled off its edge exiting the turn, the fin catches again as it abruptly flexes in response to its increased side loading, exaggerating turn-exit wheelies.

The original WhisperFin was machined out of stiff 6061-T6 aluminum billet, a big upgrade over the usual sheet aluminum used for fins. The WhisperFin PRO has been further upgraded to aerospace grade 7075-T651 aluminum for over 50% more strength, improving tail consistency through the full roll range.

Natural and Tech Evidence Supporting Chevrons

Placing chevrons along trailing edges to achieve flow efficiencies is not a new idea. In fact, it’s the product of millions of years of evolution where survival depends on competitive advantages. Here are some examples of this competitive evolution from nature, aerospace and motors ports.

Power and Efficiency of Humpback Whales

Logging distances as far as 16,000 miles through the world’s oceans, the humpback whale is among the longest migrating animals on earth. 50 million years of evolution put chevrons on the trailing edge of this 40 ton marathoner.

Mercedes Formula One Wings

The main plane of this rear wing on the Mercedes F1 car uses trailing edge chevrons to reduce turbulent eddies behind the wing. Note the similarity of the upper wing’s leading edge to the front turbulators on WhisperFins.

Silent Flight of Owls

Owls’ unique feathers, including the micro-structured finlets forming the trailing edge of each feather, were the original inspiration leading to noise abatement technology developed by Boeing, GE and Rolls-Royce.

Boeing’s Latest GE and Rolls-Royce Engines

As high speed trust merges with slower air flows behind a jet engine, the resulting turbulence creates a lot of noise. This noisy turbulence is significantly reduced by using chevrons to organizing these converging flows.

Open Class Isle of Mann TT Race Bike

The fastest motorcycle race on earth is the Isle of Mann TT. This Mugen Shinden entry is the first to show up with trailing edge chevron technology as part of their quest for higher speed.

Formula One Windscreens

Wind tunnel testing lead to a windscreen design that reduces turbulence that buffets the driver’s helmet. Similarly, the chevrons on the WhisperFin PRO reduce turbulence in their wake while sliding sideways around turns.

deep tip water whisperfin ski tail hold

Tail-hold Taken to a New Level

Blowing the tail out of the water is mostly caused by rotating so much tip into the water that it levers the tail up and out of the water. This ski’s tip has been driven about as deep as it can go, and the WhisperFin PRO still has
holding power to spare … mic drop

The bottom line is that this patent pending trailing edge is not a gimmick. It’s a genuine performance advancement, an advancement that good skiers feel in their harder passes, and an advancement that produced PBs right from the start of prototype testing.

And this performance advantage isn’t just for advanced skiers. More customers have purchased WhisperFins on the advice of their professional ski coaches than for any other reason. And that’s because it’s easier to work on your technique with a dance partner than with a wrestling opponent.

WhisperFin Original vs. PRO

The choice between the original and PRO versions of the WhisperFin isn’t so much about boat speed or line lengths as it is about skiing style. Here are some factors to consider:

  • Both fins benefit novice through expert skiers by making the ski easier to turn and accelerate.
  • Both fins benefit advanced skiers by making it easier to keep the tip down while exiting turns.
  • Regardless of line length or skill level, if you tend to approach the turn tip-high then rotate a lot of tip into the water to turn (think windshield wiper), the PRO version is far more forgiving of this technique.
  • If you tend to blow the tail out of the water or to get a lot of tail slides when scrambling, go pro.
  • If you turn better on one side than the other, putting a slight bend on one or more of the chevrons at the back can make a big difference to the symmetry of your skiing (a one-time modification for good skiers only).
  • If your skiing inputs are smooth, progressive and controlled, the original WhisperFin can take you all the way.
  • The PRO can always be mounted shallower in the ski to make it just as novice friendly as the original. But running the original deeper can’t replicate the benefits of the PRO’s improved grip at high roll angles and extreme levels of smear.
  • The original is 1/3 cheaper while supplies last.