Günter - It looks like the Haswing Protruar 3.0 with a retrofitted propeller is my best bet. Brushless, low RPM, PWM controller (I believe), and not overpriced. I wish I had figured that out earlier. I plan to retrofit a more hydrodynamic piece on the shaft of my trolling motor. The golden motors are interesting for an outboard conversion with a gear reduction, but not so much for a direct drive that requires low RPM and small cross-section. What cruising speed are you targeting for the Kat? With anticipated advancements (~5 years) in battery energy densities, a battery-powered Kat could soon be a very capable and practical craft that exceeds displacement speeds. That might be a future project for me.
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