Cavitation Issues

[davidshaw57]

I am a new RC boater and just finished my first boat but I am having issues and cavitation. The boat is more less a catamaran style with an outboard motor and the prop centerline is positioned at bottom of the sponson. I have tried many motor angles. I can?t lower the motor mount any further on transom. Does anyone have any suggestions or things I can try?

[HTVboats]

Boat size, motor and batteries, and what PROP?
Mic

[photohoward1]

Picture of the whole set-up would help too.