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Old Jun 19, 2012, 01:29 PM
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Vita ex Machinis
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Motor City
Joined Dec 2004
13,495 Posts
Quote:
Originally Posted by CaptLee View Post
...But the bottom line is that a PT is so narrow it gives you very little advantage.
Sorry, but I beg to differ! I have independent motor control on my 4 ft PT, and it's fantastic for low speed maneuvering, I can even spin the boat almost on its own center.

However, I don't have an easy solution: I programmed my own microcontroller to do the job with a 2 channel radio, which makes operation very easy... but one needs to know one's electrons and coding for this. I discuss it a bit at:
http://matthewsmodelmarine.wordpress...e-expendables/
(see the "Motivating" section):
  • Forward: The motors pull a fair amount of current even under light load. To conserve power, only the center motor runs at part throttle ahead. At about 50% throttle, the two outboard motors gradually kick in until all three reach 100% at full throttle. The transition is seamless.
  • Reverse: To avoid swamping, only the center motor is active in reverse, and is limited to 50% throttle.
  • Turn-in-place: With no throttle, turning the helm counter-rotates and progressively increases the speed of the outboard motors; port helm spins the bow to the left, starboard helm spins to the right.

For low speed work, like a maneuvering competition, I'll goose it forward a bit, go to zero throttle and steer a bit, which kicks in the wing motors' counter-rotation... that spins the boat around, almost as fun as driving a forklift!


p.s.: There are some commercial mixer devices out there, such as the one from Action... tried it, was completely unsatisfied with how it worked for me. I also suspect that mixing on modern radios may let you achieve some of these goals, but I don't see how you can get exactly what I have with my on-board micro.
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Last edited by patmat2350; Jun 19, 2012 at 01:35 PM.
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