Went out on the water today in the nice weather. Tried to capture some data on how many watts per knot is needed. These are my results: (2.3 knots 410W, 3 knots 750W, 3.7 knots 1200W, 4.5 knots 1700W, 5 knots 2900W) Diagram is made with the fantastic site Wolfram-Alpha. If these figures are correct (there was some wind...), my current set of batteries would only give 4.5 to 14 Nautical miles in 1 to 6 hours depending on my speed. I reckon I should double up my battery-pack to be able do any distances with engine only. Continued installation with fitting of motor controller to the motor jig and testing of water cooling system. Here is a picture of my current throttle control. It is attached with velcro so that it can be kept inside when not used. It is made with a rotary encoder (similar to what you find on a modern car radio?) and an Arduino microcontroller. If you rotate the knob clockwise, the motor will start going forward (indicated with a green led light), counter-clockwise and the motor goes in reverse (indicated with a red led light). Continue turning in the same direction will increase speed, turning opposite direction decreases speed. If you push the knob the motor stops. No manual required ? More on how this was built later.
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Staffan RolfssonMy hobby project, converting our sailing yacht Pilsner (IMS-33 one-off) from diesel to electric drive. Archives
August 2016
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