yup, if a motor skipped out on ya, you'd definitely have to power down and run slower to limp it home, for remaining motors not to get overloaded. theyed handle 1/2 speed for a bit. I'm just talking an "if" for some reason a motor burns up, things still happen. I have a limited experience (a good one) with a 24v 250w 2600rpm scooter motor, I ran it on 12v for 1/2 rpm, direct drive to a youngprops T-6, and it never got warm. so much smaller a boat tho, 5/16 rod through 3/8 hard brake line = perfect fit! there was about .004 clearance between shaft and tube, I did a gravity feed column to it for 50wt oil, same as a typical model boat, just larger. on half voltage, that motor still had really amazing torque for its size, very likely a great combo for something simple like an electric kayak. I probably couldda also got away with swinging one of young's 7" prop, the motor ran that cool on 12v. the boat was a slightly narrowed (and lighter) electric inboard version of svensons-com's "Bebop", which is just a cute kid size runabout toy. it'd do 3.5-4mph about all day long, stereo (with 2 10's and horns) thumping the whole way.. a fishermans nightmare! I'd almost be tempted to say use 36v motors fed 24-26v.. it'd maybe sacrifice a little efficiency, maybe not! windings never getting warm can be better than internal resistance and heat robbing it, and the long term reliability only goes up, even if runtime is slightly shortened. spinning slower probably also pulls less amps and build less heat.. honestly.. I'm also thinking the real torque is more a function of the motors magnets, that scooter motor spun slower but there sure wasnt any lack of torque! another tidbit about the scooter motor I played with, it wasnt "notchy" and didnt slow down really fast when the shaft spun by hand, so in a triad, if one let go, it'd be more like an idler pulley, not adding a buncha load to the other two.. but idk if they're all like that. it was brush type, neutral timed, would power forward or reverse same speed. I sure like the potential hull speed of something 30ft, 8.5mph is decent if it'll do it. --- On Tue, 1/24/12, John Green <v_2jgree@operamail.com> wrote:
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