Hi - I have purchased a 17' Sportspal canoe and want to outfit it little by little for fishing.  I have a portable depth finder with a suction cup transducer that I've used on small boats with a flat back.  I'm looking to see if there is a transducer arm of some sort that I can clamp to the side of the canoe or something similar - preferably something with a swing-arm so I can just flip it up out of the water when beaching.  Any suggestions where I may be able to find such a contraption?  Thanks!

I use the Slidetrax Transducer Deployment Arm - mid-$20 range. It's available at a number of vendors but I got it at Austin Kayak (free shipping if your order is over $39).

http://www.austinkayak.com/products/1682/Wilderness-Systems-Tarpon-Slide-Trax-Transducer-Deployment-Arm.html

You'll want to measure from the top of your gunwale down to the waterline to make sure the arm is long enough for your canoe. The arm extends down 12" from the mounting surface and then the transducer hangs down a bit below that. In my case - the arm was the perfect length - the transducer is completely submerged, but doesn't extend below the bottom of the hull.

The photo shows the transducer arm mounted on my "dashboard" (that also holds the sonar and a rod holder). You would need to have a horizontal mounting surface for the arm.

BTW - the rigging of my canoe was covered in this thread:

http://www.bassresource.com/bass_fishing_forums/YaBB.pl?num=1262097737/15#15

Another shot of the transducer arm: