Alumacraft Boat, mounting Transducer Downrod on Flat Surfaces

Alumacraft boats have many types with wide flat gunnels.  These flat surfaces provide an excellent point of installation for a transducer downrod system. In addition Bay Boats typically have wide gunnels which also allow for flat surface mounting of a baseplate and downrod system. Any level area that has a 4×4 inch area that is flat can use a simple sub plate mounting. Baseplates sit atop the sub plate using one of two mounting methods. Thumbscrews:  a couple of nylon thumbscrews that act as a quick removal as well as a strain relief should the downrod hit something while deployed. Magnetic Switches:  magnetic switches Baseplate selection should take into consideration the span, or distance, from the outer edge of the sub plate to the outside rub rail of the boat.  Refer to the drawing below, Dimension D. Bowducer Baseplate Dimensions