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Step 6Diving and depth control
Now slide the sail/keel/motor assembly forward, making it lean forward. The surface of the solar module will act as depth rudder and push the sub downwards (dynamic diving).
If under direct sunlight and with the motor completely at the bow side of the slit, the sub still does not dive, carefully remove a little floating material at the bow. Do not remove to much, as your sub should still float to the surface when the motor stops by making shadow over it. This is your first way to control the depth.
If the water is partly in the sun and partly in the shadow you can "automate" the depth control. You use the rudder to make your sub run in a circle, just touching the shadow area. The sub will rise in the shadow and dive in the sun. Trimming the circle to keep it between surface and bottom is a fun challenge. Check out the video.
If under direct sunlight and with the motor completely at the bow side of the slit, the sub still does not dive, carefully remove a little floating material at the bow. Do not remove to much, as your sub should still float to the surface when the motor stops by making shadow over it. This is your first way to control the depth.
If the water is partly in the sun and partly in the shadow you can "automate" the depth control. You use the rudder to make your sub run in a circle, just touching the shadow area. The sub will rise in the shadow and dive in the sun. Trimming the circle to keep it between surface and bottom is a fun challenge. Check out the video.
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