Hi Eric, thanks for the calculations. The measurements were taken fairly quickly, as the day was cold and rainy, and Sparky offers no protection from the weather. The watt measurements were taken from the high current version of the Cycle Analyst made by Grin Technologies here in Vancouver. The speed was taken from a Garmen GPS, and only one way, so that may have contributed a small error, especially at the lower speeds.
Going forward I am thinking of trying to get the speedometer function of the Cycle Analyst working with a paddle wheel type sensor from Humminbird. I also need to make a permanent fairing in front of the motor mount, to replace the scrap plywood that was attached as a temporary fix. It will have a sort of skeg, which dose not ride in the water most of the time, but will deflect waves without shooting water forward.
The motor mount was raised 1.25 inches after this video was shot.
Also need to keep an eye on the voltage sag of the GB battery. The BMS is going into alarm at 4000 watts plus, as some cells are dropping below 3 volts. This may be somewhat due to the cold temperature (10 degrees C as measured by the BMS). The Tech at Elite Power Solutions also suggested it may be less that optimal connections at the batteries, as they are rated for 3C (15,000 watts) and a friend suggested using Caig labs L260 CP conductive grease.
Most of this may have to wait until the spring though.
Best,
Dave E
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