Mr Brussel sprouts, you better click away and go for a paddle, as the following discussion may contain math, useless conjecture and unashamedly biased opinions of the writer.
In other words, crap, so run away and paddle now before you get upset.
So I did as I said I would, and put a camera on my paddle shaft.
Much more illuminating than I ever imagined. (excuse the pun)
I tried an Epic mid wing and my mid-large wing at different lengths.
Because the camera had such a close look at the blade, it was quite easy to see when power was being applied and when it wasn’t. It was also easy to see how far away from the side of the boat it moved during the stroke and most importantly, because the frame rate is known, very easy to get accurate measurements of time spent during various phases of the stroke.
So here is a quick non-technical rundown of what I found.
Understand that this is what occurred with this paddler, you may be different and I encourage you to experiment, if nothing else it makes for a great recovery session that is interesting.
The smaller midwing moved outwards more during the stroke, ie at a faster rate.
I presume it is because it had to move faster to maintain the same rate of lift as the larger wing.
The smaller wing also had a slower catch and encouraged a deeper catch/stroke.
A greater part of the time spent in the water was further away from the hull than the larger paddle.
The total time for a complete stroke,(the power phase and the recovery) was for all practical purposes identical for both blade sizes, only the length of the shaft changed things.
A shorter shaft simply meant a quicker recovery, less time required for the catch and less time on the exit.
The actual time spent in the major power phase, was longest for the larger paddle due to quicker catch.
Less time was wasted in recovery for the shorter lengths.
The setup with the largest relative time spent in the major power phase and the least spent in other areas, ie it’s duty cycle, was the shortest largest setup.
This is a relative measurement over time, so a shorter paddle took less time during the stroke, but more strokes overall in the same time.
The smallest power phase vs versus other time, was the smaller longer paddle, due to a longer amount of time spent for the catch, more time spent exiting the water and more time taken to swing the bloody thing around to start all over again.
So a large wing set up short, gave me more percentage time on task than a smaller wing setup long.
I would reason that this is why I personally can get a higher oxygen consumption (higher heart rate as HR is controlled by oxygen demand) and therefore more power with a shorter paddle than a longer one.
The smaller wing encouraged more time spent in the catch phase and worked best if a bit of vertical movement was also involved, ie, it moved down during the catch and first part of the stroke and therefore felt to linger closer to the boat, for a longer time, at the start of the stroke.
It did however make up for this with a faster blade movement during the mid part of the stroke and quickly overtook the larger wing on its way to a wider finish.
The wider stroke for the smaller wing I found quite a surprise, as the opinion you form whilst actually paddling is the opposite, probably because of the way it seems to hang closer to the hull at the start.
The larger wing simply hits the water and goes out immediately as the catch happens so fast and you feel that it is overall wider because of this.
This faster catch also means that the larger blade takes no more time for a full stroke than the smaller one, and was actually a bit quicker, but really the difference is down in the noise somewhere, so I would be happy saying they are the same.
So a couple of surprising things for me and certainly worth the couple of hours to find out.
Follow the path of the independent thinker. Expose your ideas to the dangers of controversy. Speak your mind and fear less the label of 'crackpot' than the stigma of conformity. And on issues that are important to you, stand up and be counted at any cost.--- Thomas J. Watson