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The thruster in this instructables was intended for small underwater robots, not kayaks. It probably won't be sufficient.
Might be best to start with an electric trolling motor, they're made for moving a boat, and run off of a 12 volt deep cycle battery. Plus they have a speed controller. Of course that takes away the fun of making something yourself :)But if you look up the specs for one of those, it would give you a good starting point. http://www.islandhopperoutboards.com/kayak-trollin...30 pounds thrust, made for a kayak, and $135 (I believe that us US Dollars)Now if you work backwards from that... :) Have fun, that's something I've always wanted to experiment with.
How to build a thruster for a homemade submersible or ROV
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Hi, thanks.I doubt these thrusters will be strong enough for that. Maybe build one and try it out to get a feel for how strong they are.
Hi, Great Instructable! I was thinking about building an underwater iron man suit by having 1 of these strapped to each arm / leg. Would that provide enough thrust to propel me through the water, (with no current). If so how fast? Thanks in advance, Justin.
Most excellent circuit. Simple, no IC's, no inductances, helps understand how chaos can appear even in this simplest RC oscillator via a non-linear component added to the feedback path.I've breadboarded this and shot a short video on an old tek analog scope. The attractor is beautiful:
Very glad you enjoyed the clip : Bunch of questions: - Have you tried to couple two (or more) of these via - say - a cap to get hyper-chaos, or do they synchronize ? - How fast do you think this can get to ? Do you think it can get to MHz range with smaller caps ? - What do you mean by band-shaped ?
Thank You! Nice Clip. By Playing with the supply voltage and the resistors to Q2, it is possible to get band-shaped chaos too.
Build a chaos generator in 5 minutes!
Cool use of a 555! Do you think it is possible to get it somehow working without the comparator (maybe at the cost of reduced regulation precision)?
actually, RC model manufacturers offer many propellers designed for boats, from very small (cms) up to 100mm too. check out Robbe or any other RC parts manufacturer. Eagerly awaiting your results...
Thanks! In all likelihood, a single thruster like I built won't be enough to propel a kayak, maybe 4 of them might do it. I'd say: experiment a little and see. Please post the results here.
Thanks! Also, SPICE models differ a bit per manufacturer, even for the same type of transistor. Even so, indeed the circuit is pretty much foolproof.
This is a great project for those wanting to learn about chaotic electronic circuits. Build the circuit out of real components or simulate it using one of the SPICE simulators. Either way, the circuit is practically foolproof. Any common general purpose NPN transistors (such as the 2N3904, 2N2222, or 2N2222A) will work fine although you may have to "tweak" some of the other component values a bit to get the same strange attractors that the author did. Remember, SPICE models are never perfect and the properties of real transistors vary slightly from one to another. That's why you sometimes have to "tweak" resistor and capacitor values.
Had to restart a few times to get the size right, but it worked out pretty well in the end :-D
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good job. very interesting concept in math and engineering
A Simple Chaos Generator
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