"Alycia & Kevin Miller-Lynch" <ak@...> wrote:
> Question for you all:
Logic tells me the only way to get
> more thrust from the same prop is to spin it faster, which would lead me to believe a 24 or 36 volt system would move a boat (with a slippery hull)faster.
Answer: All MinnKota and MotorGuide products (12v, 23v, 36v) are design to spin at about 800 rpm for a max speed of around 3 mph . . . though they claim 4 mph.
Question:
. . . motorguide now has a varimax motor rated at 70lbs, with digital control for under $350. It seems a pair of these would move a 16' hull (Launch style) fairly well for a lot less money than a torqueedo, plus twin screws would just be cool. I'm thinking something like devlins Godzilli for the kids to play in, and me to go fishing in. Top speed of 5knots, cruise at 4? Fish all day at 2-3.
Answer: Twin screws or even 6 screws will move you at same speed. More screws will reduce slippage with heavy load, but will not increase speed.
Twin screws work well with differential steering for total hands-free fishing. See www.streamdancer.
Some have tried 24 volts on a 12 volt motor. Yes, the rpms increase dramatically for about 20 minutes until the motor burns up. Since no off-the-shelf higher pitched props exist, some have fabricated higher pitched props themselves. I'm using augers which are expensive to produce but work well under 9 mph. On a light boat they work well with trolling motors. You have to be careful when incresing pitch that you don't overload the motor and burn it up. An amp gauge is imperative.
John Zimmerlee
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