Ma-Sea Solar boat

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Joined: 08/11/2016
Location: Australia
Posts: 814
Posted: 08:06am 24 Jul 2017      

Judging by the photos and your description of the back sinking as you increased power, there should be a 'trim' adjustment usually between the bracket that bolts/clamps to the boat and the motor itself, it sounds like the motor is angled too high and needs to be dropped ie trimmed in (basically the prop moves closer to the boat and the axis of the prop is lowered more to the horizontal)
The adjuster is usually a series of holes that you select the angle and push the pin in to hold the motor at that angle

The trim will make a massive amount of difference to your speed and 'fuel' consumption so I would expect to see the speed increase for the same amps correctly trimmed