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An Explanation of the S.O. Terrik Blade Shape

Photo: Rob Hall


Photo: Rob Hall

The S.O. Terrik blade shape was evolved over about a three year period, from  about 1980-83, and went through about twenty shapes before its final dimensions were realized.  It was derived from a "Slasher" blade shape which Jim Snyder had designed and named in the summer of 1975.  In  search of a softer feeling blade shape with less grab, the first  intermediate shape, called the "Strider", was tried.  It had a rounder tip than the Slasher and an "S" shaped cross-section  which mellowed its entry and, by virtue of the cupped upper blade,  presented itself at a diving angle throughout the stroke.

Surface area ~90 square inches

Jim felt this was still too much pull and so holes were drilled through  the blade in various fashions.  This shape concept was called the "Torquer"  and was finally a soft enough feel.  The holes in the blade perforated the eddy which forms on the back of the blade.  This eddy is one of the prime causes of the wobble felt when pulling a blade symmetrically through the water and the holes did a lot to neutralize its effect.  This produced a blade with the softest possible feel but there were still two problems.  The first is that the eddy could not be completely canceled out and so  always had some residual effect on the balance of the pull of the blade.  The second problem was that the blade shape made it hard to transfer body english applied through the wrists into effects felt in  the performance of the boat. In other words, the shape was too bland to communicate the user's intentions in a subtle fashion.

As a solution to the bland feel and in an attempt to create a blade that would rudder subtly when surfing, Jim conceived a bump on the lower outer end of the paddle.  His thinking was that if the twisting effects  could not be erased, maybe they would be easier to deal with if they could be redirected in a single direction with a rolling of the wrist.  Giving the "wobble" a sense of direction introduced "flavor" to the paddle, making it easier to transfer body english to the boat through accentuated twists of the wrist.  This was the last step to minimize the detrimental effects of wobble on the feel of a stroke.

In the beginning the bump was subtle and the blades were relatively  large and still had about eight holes cut through them.  Some even had a  dihedral ridge hand carved down the center of the power face.  The earliest  versions with bumps on the end were the first to be called "S.O. Terriks" even though there were over a dozen different shapes.  The  designs evolved to have the outer bump, called the "Dipping Edge", grow larger as the inner bump, derived from the original Slasher, grew much smaller.  All the while the lines of the upper blade  were smoothed out.  As the blade shape grew smaller and sassafras started  being used in shafts, the softer feel became available without having to  drill holes in the blades.  Finally the shape arrived at its present perimeter around 1983.

Another alteration to the shape evolved in 1989 when Jim filled in the  bumps on the back of the flat faced blade.  This improved the wing  characteristics of the blade shape for when it was being used edgewise  during sliding strokes.  Advanced screw and mystery maneuvers were demanding more and more sliding strokes and there was need for the blade  to pull in a slick and stable manner edgewise.  These blades had a smoother feel but there was a price of added weight to pay.  Eventually the shape evolved to its present "Trik Style" form around 1996.  This means  the blade is centered on the shaft -- like a canoe paddle is (a "bi-facial dihedral").  This keeps the weight low, the flex high, and still maintains excellent wing dynamics.

Although many people consider the S.O. Terrik blade shape to be small, the folks who use them say it is just enough blade to get the job done.   The blade shape is superior to normal symmetrical and asymmetrical blade shapes by way of being more efficient.  Although only subtly better in many ways, the benefits add up to a tool which works very well for what it was  intended.  Some of the benefits are as follows:

1.    The smaller blade shape is always able to rip through the water  instead of sticking into a certain patch of water.  This allows a fuller range of motion per brace or stroke.  This gives the user more fluid  ability to shape the stroke so it best supports his effort and it allows a fuller range of muscles to apply to the work needed to be done.  This  combines to create a more fluid, dynamic way of dealing with unusual  strokes that can shape the performance of the boat in crucial situations.  It also helps guard against shoulder injury by presenting less initial impact than what is found in most blade shapes.

2.    The smaller perimeter means that the blade is extended less from the strength-giving center ridge running down the center of the blade.  This lets the perimeter be stronger as it refers more quickly to its  support system -- the center of the blade.  Having a minimal perimeter also  helps transfer the stress of large impacts over the entire structure of  the blade which better helps it to bear the load inflicted.

3.    Having the minimum necessary blade area means there is less wood  in the blades.  This means the blades are lighter which greatly improves  the "swing weight" of the stick.

4.    The rounded tips have no corners to wear out first, and contribute  to a smooth entry and exit for strokes at any angle.

5.    The dipping edge enables you to rudder with a variable amount of  blade which gives varying amounts of controlled resistance.

6.    The dipping edge also allows for the superior feel found in these  paddles.  This is because it lets the user roll his wrist to make the power face pull at a greater variety of angles -- even up.  This is very important  in short squirt boats which can flip end for end in unfathomable angles.   The better applied stroke angles mean the work is being done more efficiently, with enhanced feel.  The blades are "articulated" to better address the variable needs of cubic steering strokes.

7.    The tight perimeter of the blade shape helps the paddle leave the  water faster -- its "releasability".  This is very important during  transition moves, such as cartwheels, when blades can easily be bogged  down in the water so much they can't be set up quickly for the next move.  This minimizes the users reaction time in very crucial junctures of  performance.

8.    The 40 degree feather helps minimize the users reaction time also.   This is because it takes a few fractions of a second less to twist your  wrist the lesser amount.  The lesser angle also allows for a better bone  alignment in the upper, (pushing) hands wrist.  This means more of the work of a stroke is being done through bone on bone junctions instead of flexed ligaments and tendons.  This coupled with the small powerface makes a blade  that fatigues its user less.  This lets the user have more energy for more  important things -- like playing.

In conclusion, the S.O. Terrik blade shape is stronger, more releasable, gives a quicker reaction time, helps fight fatigue, transfer body english into performance, and reduces chance of injury for its users.  It functions well as an adaptive devise for quasi-amphibious humans.


Copyright 2001 Preferred Modes.  Site maintained by Mary Kay Heffernan