One potential pitfall (which Bob Twogood pointed out to me) is beginning your pull before the paddle is fully inserted.
Bob describes insertion as like "Spearing Fish": you slip it into the water, but do not pull... once it is fully planted, then you pull.
Tangentially, when I took a several-day-long swimming course from some guys working for Total Immersion, the emphasis was on perfecting one's stroke and not speed. The idea was to totally master the stroke and, only then, work on how many time per minute you can turn it over.... seems to me like this would apply to paddling too.
FWIW, here are the notes I took from Bob Twogood, and from Greg Barton.
Reviewing them now, I find myself gravitation to Barton's.
Twogood’s Wing Paddle Technique
Bob likes to listen to catch & finish and try to keep them quiet even with power on when doing sustained speed work.
The faster you go the shorter the stroke. Olympic sprinters: stroke starts ahead of feet, power done by ankle, blade leaving water by knee! In fact, there is talk about no power stroke at all: just the catch. The blade acts as if it were thrust into the water and bounced back. No pull, just power in and release.
Be sure to use a lot of power from the top hand. Use top hand to snap the blade in. Then, when the blade is buried, continue to drive across with the top hand. More pressure with the top hand gives more leverage with the trunk and gets more power to the water.
You can only concentrate on one aspect of technique at a time.
Training Techniques
• Straight-arm paddling.
• Pause & do "form check"
Windup
• Cock rear shoulder back
• Continue rotation after paddle exits - setting up for next stroke
• Elbow leads
• Elbow up - head height
• Extend & relax fingers
• Twist hips
Catch
• Drive blade into water (Note: "Spearing fish" - motion of blade creates lift forward)
• Push w/leg
• Top hand pushes @same rate as rotation (Note: Too fast gives 'futile' feeling)
Power
• Drive w/leg
• Lower elbow stays straight
• Power from stomach (Note not arms or shoulders. This gives added benefit of lowering one’s center of gravity.)
• Top hand pushes straight - but across boat; this prevents generating side force.
Exit
• Dump water from blade by starting shaft twist.
• Exit MUCH earlier
• Lead out w/elbow higher than hand
Greg Barton
Tendonitis is the big one that many newer paddlers have trouble with. The prevention is:
1. Loose grip (push with the base of the thumb and pull with a 'hook' in the hand, not a death grip)
2. Clean technique. Work on a quick, quiet catch without any noticeable 'pounding' of the paddle into the water, and smooth pull on the paddle. I like to tell beginners to 'sneak up on ducks'. The stroke should be that quiet and smooth.
Work on smooth and build the power - don't start out by doing nothing but sprinting and hammering.
A wear and tear region that flatwater kayakers seem to agree on is in the tailbone region if the seat is improperly padded. Don't sit directly on glass or plastic, and cut out for the tailbone if needed.
I like to listen to my catch and finish and try to keep them quiet even with power on when doing sustained speed work.
One thing to note, the faster you go, the shorter the stroke. If you check on the true Olympic sprinters, the stroke starts ahead of the feet, the power is done by the ankle, and the blade is leaving the water by the knee! Now, that takes real power.
In fact, there is some talk of there being no power stroke at all, just the catch. The blade acts as if it is thrust into the water and bounces back out. No pull, just power in and release.
Be sure to use a lot of power from the top hand. Greg Barton describes the catch as 'stabbing fish'. Use the top hand to
snap the blade in. Then, when the blade is buried, continue to drive across with the top hand. More pressure with the top hand gives more leverage from the trunk and gets more power to the water.
The Basics: (per
www.sfdj.com/fall/freedive/technique.html)
Your top hand stays high --neck to eye level, and forward. Both arms stay nearly straight at all times, particularly the top arm.
1. You reach forward, your top hand inserts the paddle blade completely into the water, and you gain propulsion by rotating your torso, the paddle actually heading away from the centerline of the boat by about 30 degrees---it heads out laterally, actually providing a significant brace with each stroke.
You do NOT use your arms to pull the paddle backwards along the centerline of the boat.
You end your torso rotation (the power source of your paddle stroke) by the time the blade reaches the area perpendicular to your body….it does not go further back.
2. You raise the paddle out of the water at the end of its stroke, and rapidly move it upwards to take on top hand position for the other side. This is the (SIC – rest of sentence missing from web page too…)
3. Normal paddling for good kayakers/surfski paddlers will involve turning over the stroke 90 to 120 times per minute----this is a cadence nearly identical in speed to the pedalling action of a road cyclist.