So the project boat took a little twist on me this week. It seems I have a few issues using the 70# thrust Vector motor. One is it's weight relative to the little bow mount transom adapter it is being mounted to. A motor that big and powerful really needs to either be mounted to a true solid transom or have a typical bow mount support in place. It had the adapter mount waving like a flag in the breeze despite the 4" bolts in the base plate and the 2.5" stainless screws. Another was that giant handle extension that you just couldn't do anything with. It will even extend out further, but I really needed it to push in further to lay correctly up front.
So I did some extra supporting of the transom adapter bracket by making L-angle aluminum bracing to help restrict any exta movement in the upper part of the plate. I'll diagram that later in another post. I also did some soul searching and decided to downsize the troll motor both in weight and in thrust. Taking into account the typical speed settings I currently run with my 65 MK Maxx, the weight of the boat I'll be moving (easily <1/2 the weight), what type water I'll mostly be fishing (lakes), and the realism that this setup in general is not going to be a high powered bass boat type approach.
After a bunch of researching and store shopping (in person and online), I had decided on a MK Endura. But I ran into a little problem, and that was trying to figure out some of the technical aspects of the motor. It is 5 speeds forward instead of 'infinite' speed settings, so what type amp draw, how much thrust per speed setting, etc. was what I wanted to know. MK's site wasn't much help, nor any other site that I came across. That is until I went global and found the Verkauf von Schlauchbooten page out of Berlin.
A click to any of the trolling motors on this page will take you to a descriptive along with the needed technical information I was looking for. Here is the page for the MK Endura. If you scroll down you'll find all the Endura models listed along with their technical data. Other links on that page take you to descriptions of specific features like "Maximizer" and "Cool Power". I particularly found the Maximizer graphic interesting as a closer look reveals that the slower you actually run your motor, the more benefit you'll receive from this feature, exactly opposite of what I expected. If you run 90% plus open all day you actually don't gain any benefit from this feature, much like the hybrid cars being produced.
Back to the Endura technical page though. Deciphering this data required this handy little tool: English-German Dictionary. It actually works both ways so I was able to enter the German words to get English translations. Many of the metric conversions were a piece of cake since I work in a science-based R&D facility and am used to using this system. The only one that threw me was the 'kp' units for "Schubkraft" or 'thrust'. This turned out to be 'kiloponds', which is an equivalent conversion for pound-force.
So I ended up purchasing a brand new Endura 40. This required changing over the existing wiring to a 12v system and some wire rerouting. But I now know exact amp draw, power and thrust for every speed setting on the motor, along with things like overall weight and maximum recommended boat weight for this motor. I shouldn't have to worry about this motor over-powering my little conversion bracket now. And, I can always swap this out in the future if this choice proves to be a poor one under actual lake testing.