Paul and All:
Yesterday, I got busy in the evening and made a resin shoe for the thru-hull transponder to fit on the hull of the lancer. The deep vee of the hull neccessitates a shoe, otherwise the transponder would read at an angle to the bottom, giving a false depth reading.
There are several ways to do this, using different products. I accept that a thru-hull means a hole in the boat, but here in the Cheasepeak, with its estuaries and eateries, I find that a depth guage is handy. Thin water will be no good for this Lancer with its rudder and prop hanging down. I opted to drill a hole verses cutting out a shoe shape in the hull to fit the transponder. I will 4200 the hull between two of the shoes so that I get a stright down position for the transponder. I am placing the shoe just aft of the seats and about 12 inches past the beginning of the prop pocket and well above the bottom of the keel on the starboard side. These photos document the building of the shoes that will go on the outside of the hull and on the inside of the hull.
I used basic resin and hardner along with West system 401 ballons. These are useful for structural filler, are strong, and sand easily. I used a plastic bottle to get a blank, then used a band saw to get a rough shape, drilled out the hole for the transponder with a forrester bit, and sanded away everything that did not look like a shoe.
Next, I will sand off the bottom paint on the hull, glue the shoe in place, drill the hole in the hull, and resin the outside of the shoe and hull, then paint with bottom paint. Inside, I will place the reverse of the shoe on the hole and glue it in place, then resin again. Last will be installing the transponder and wiring it to the guage. Here are some photos.
Next photos will show the placement.