Minn Kota Endura Trolling motors and their small propellers can usually be lifted, either manually or via an electronic system.

http://www.minn-kota.com

A Motorguide Trolling Motor is a small engine affixed to the bow or stern of an angler's boat that provides source of power for slowly trolling a lure or natural bait through water where fish are sought, or to allow for precision maneuvering of the boat s

http://www.trolling-motor.info/