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Re: validity of boat velocity measurements

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  • Re: validity of boat velocity measurements


    I believe most auto magazines and auto manufacturers use VBox made by
    Racelogic for car performance data acquisition. Their devices log data at
    5-100 hz.

    The VBOX II SX5 samples at 5hz and retails for £1600 (~$2600). Listing on

    The VBOX IISX is a powerful instrument used for measuring the speed and
    > position of a moving vehicle at 20Hz. It is based on a new generation of
    > high performance satellite receivers, and will measure acceleration figures,
    > braking distances, lap times, cornering forces and much more. Due to the
    > small size and simple installation procedure, the VBOX is ideally suited for
    > use in cars, bikes, off road vehicles and *boats*.

    Hope this helps.

    Dat Phan
    MS Student, Kinesiology
    San Francisco State University

    On Wed, Nov 18, 2009 at 10:32 PM, Lisa McDonnell

    > I'm interested in devices used to measure boat velocity (ie: sprint kayak)
    > accurately... given flat-water conditions, little wind etc. It's important
    > that we reach a high level of precision and interested in calculated stroke
    > to stroke boat velocity (takes approx. 0.4 - 0.6 seconds for a single sided
    > stroke) when determining performance variables.
    > I have considered impellers with a velocity sensor made by NK used for
    > Rowing, but have also heard that there are high frequency GPS systems that
    > exist and sample at 4 Hz? Can anyone suggest a product, or know the
    > approximate cost of such a GPS device? Or are there any other devices that
    > can measure stroke to stroke boat velocity?
    > Thanks,
    > Lisa McDonnell
    > PhD Student
    > Institute of Sport and Recreation Research New Zealand
    > School of Sport and Recreation
    > AUT University
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