22' CD Transom angle?

J

John J

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Nov 23, 2003
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C Dory Year
2002
C Dory Model
22 Cruiser
Vessel Name
John J
Happy Fourth of July! I'm installing a transducer for my new Garmin 340C fishfinder. Installation requires knoweldge of transom angle. To give you some insight, I failed geometry in high school. By my measurement, the transom angle for my 2003 22' CD cruiser is about 20 degrees. Is this accurate? Can anyone help me? Thank you.
 
Mike, is the boat out of the water? I'd assume so.

Just align the bottom of the xducer parallel to the bottom of the boat and a lilttle below. You should be good to go with no math.

Charlie
 
Hi Charlie, Thanks for reply. Boat is out of the water. This thing comes with plastic shims. Directions state to use shims for different transom angles. What do you think?
 
Airmar P66 series transducer? I forgot the angle but you will definitely need the wedge and even then I had to do a little filing to get it precisely where Airmar wants it; slightly angled lower at the rear. A hint: Use dishwashing detergent on the puck to clean it and let the lake wash the detergent off.


Don
 
Hi Don, Yep, that's the one Airmar P66. Thanks for the cleaning tip.
 
Sorry, Mike on the John J (on edit) , if you're in the salt water near Annapolis, you'll also need to put some antifouling on it. West Marine sells it in a spray and a little brush on bottle for transducers. Well worth it, didn't have any on mine this year and withing 6 weeks it had barnacles growing on the bottom. When I took the boat out to go to Langford, I had to chip them off and now I have the paint again!

As for the angle, just below the hull, down slightly aft. You can eyeball it.

Charlie
 
Ok, Thanks, Charlie. Good advice.
 
Just out of curiosity I measured the transom angle on my 2002 22' cruiser. I came up with just a shade under 18 degrees. I measured near the centerline between the twin engines. I used two long straight battens and clamped them together at the pivot point. Strangely I noticed that the transom wasn't exactly flat but was slightly concave between the top edge of the motorwell and the bottom of the boat.
 
Hi JJ, Here is an Airmar P-58 Transducer_Mounting_Plate.sized.jpg A straight edge layed onto the hull will allow you to position the 'ducer correctly. Aft-end slightly lower. This is from my instruction manual
2. Using a straight edge, sight the
underside of the multisensor relative to
the underside of the hull (see Figure 5).
The stern of the multisensor should be 1–6mm (1/16 –1/4")
below the bow of the multisensor.
Caution:
Do not position the multisensor farther into the water
than necessary to avoid increasing drag, spray, and water noise
and reducing boat speed.
3. Using the vertical adjustment space in the bracket slots, slide
the multisensor up or down until the bottom left corner of the
multisensor projections 0–3mm (0–1/8") below the bottom of
the hull (see Figure 4). When you are satisfied with the position
of the multisensor, tighten the two bracket screws
Click to expand...
 
Wow, A lot of responses and good information. CD people ARE special! Weather permitting, I'm going to work on her today. Thanks to all for the assist and good advice and pic. This will really help.
Mike on the John J
 
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