Dead Rise Angle

[Jim]

I'm installing a depth finder on my O'day 23. It will be a "shoot through the hull" transducer. My question is how do I find the dead rise angle so that I can mount it properly? The directions with the depth finder weren't very clear to me. Any step by step directions from anyone would be greatly appreciated.

 

[Gary]

My 2 cents...

I don't think it will require as much precision as you're thinking. I mounted mine last year under the v berth. Made a duct tape "dam" to prevent the epoxy from running down the bilge, and eyeballed the position of the transducer. Held in place till it set up, and it is surprisingly accurate. Make sure prior to epoxying in place you test the system. I did this by filling a ziplock bag with water, lay it where you plan to mount the transducer, and shoot through the bag. During this test you may experiment with the transducer angle. Make sure you use an epoxy that is pigment free. I used the West Systems two part epoxy and it worked great. Good luck!

 

[Mark R.]

doing same on my Oday 23

Hi Jim,I'm doing the same on my Oday 23 as well. In addition to installing a Raytheon knotmeter. I'm mounting my "thru-the-hull" transducer in under my V-berth..just forward of the keel and to starboard of my knotmeter (which is on the port side) It'll be like 9" or so forward of the keel.At that area, the dead rise angle isn't that high and should be a good enough placed for sound readings.Testing out your tranducer by done by Gary's recommendations. My instructions also gave some other options, one of them was by applying some petroleum jelly to the bottom of the tranducer and putting it in place with a twisting motion, knocking out any airbubbles. When it comes time for complete install, ensure you don't have air bubbles in the epoxy.