In the last two years I was able to test my trolling motors but with a not fitting boat. The boat was a small (3.9 m) RIP runabout for up to 50 HP engine. My trolling motors are 960 Watt and 1,400 W Haswing Protruar 2.0 and 3.0 outboards . These outboards have a direct drive with brushless motor and internal electronic speed controller (ESC). Because these type of boat hull keeps poorly track at low speed and wasted energy at its stern going displacement speeds. The motors didn't work bad, but I found the 28 mm shaft a bit weak and its circular cross section has an unnecessary drag. Because I'm building a Kat I will use 2 motors one at the stern of each hull (outboard or may be kind of pod). Tiller steering will be not possible with 2 outboards 1.9 m apart. So I will have to change some things or build my drives myself. I'm planning now tu use the Protruar as retractable bow-thruster. For the drives I ordered brushless motors from China (Golden motor), watercooled, 3 kW each and VESCs (Vedder ESC) to control them. Like you, I'm not able to measure the rpm under water, but the VESC is able not only to feed the motor best possible but also to read a lot of data and provide it to the user. I will see if this promises will be kept.
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