Paddle Motion

Discussion in 'General Paddling Discussions' started by dut, Dec 10, 2014.

  1. dut

    dut Paddler

    Oct 28, 2008
    Several of you were interested in the paddle motion or path shown in the Light Painting post for analyzing your own stroke . I thought I would pass this link along on the same subject. This is from David Johnstons's Paddling Headquarters site. The Motionize device shows the stroke path as well as other information. ... live-coach

  2. JohnAbercrombie

    JohnAbercrombie Paddler

    Dec 7, 2011
    Victoria, BC
    Thanks for that link and info.
    The 'Motionize' device and app(s) look interesting.
    Right now it's pretty much 'vapour-ware' - I wonder what the price will be when it's eventually released?
    I'd also be curious about the cheapest Android phone that would work with their (as yet unwritten) Android app, since I don't see a smart phone in my future plans otherwise.
  3. Tsunami

    Tsunami Paddler

    Nov 13, 2013
    This thing is fantastic imho.
    Approaching middle age and witnessing the tech that has come into the world, all I need is to somehow be wealthy enough to enjoy it....
    Good thing I grew up without it and know how to survive on my own, but That would be one thing I'd like to have. Along with those programmable LED light sticks on my paddle.

    Perhaps I should hold my breath and wait to win the lotto, It'll be good practice for kayaking... ;)

    Tiger Tsunami.
  4. Dan_Millsip

    Dan_Millsip Paddler & Admin

    Mar 8, 2005
    Beautiful BC
    That is really cool. I can see how this would help make someone a very efficient paddler.

    It will initially be an iPhone app but an Android version will be out shortly after the iPhone release in mid 2015.

    The manufactures website is at

    Here's the video that shows exactly what it does:

  5. Mac50L

    Mac50L Paddler

    Aug 18, 2014
    South Island, New Zealand
    Just a little question - If you look at the video, at the end it gives a readout, he paddled 9.2 miles. The time given is 25:12:36. Is that local time and the sun is shining or time paddling? If 25 hour then dead slow. If 25 minutes it means he did near 20 miles an hour! As we allow 3 knots cruising speed, possibly double that as a top speed i.e. 6 knots which is ~8mph.

    Am I missing something, or does it not matter, or....
  6. tiagosantos

    tiagosantos Paddler

    Jul 31, 2014
    Burnaby BC
    The entire video is a bit of a preview of what they think they can do - as far as I know, the device doesn't exist yet. The details at the end, mileage, time, etc are made up ;)
  7. Roy222

    Roy222 Paddler

    Jun 2, 2009
    Nice Video- not much more!
    Maybe he is looking for venture capital.
    However a simple smart phone app that used the built in accelerometers might be possible.
    A simple readout of Jerk would indicate how efficient your paddle stroke was in real time.
    Jerk is the second derivative of motion. Acceleration is the first derivate of motion.
    In other words, Jerk is a measure of how smooth you accelerate.
    My theorem states: smoother (less Jerk) you paddle the more efficient you paddle. The kayak does not care and can't know what your stroke looks like.
    The Jerk read out might need a speed adjustment to compensate for increasing momentum as your speed increased.
    That's as much math as I know. So I can't take this idea any farther. Are there any math majors reading this who could correct my mistakes and expand the idea?

    If you want to see how sensitive your smart phone's accelerometers are down load a Sleep Cycle app.