Low buck bow thruster?? - Page 2 - SailNet Community

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  #11  
Old 11-30-2006
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Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice
How about a JATO???

Check it here how it works!!
http://darwinawards.com/darwin/darwin1995-04.html
benesailor likes this.
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  #12  
Old 11-30-2006
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Quote:
Originally Posted by k1vsk
I have seem this question asked before elsewhere - presumably by you?
Guess you didn't like those answers but suspect you'll get the same comments here, if not worse.
Not me but thanks for your great reply...

Some of the motors have 60" shafts and well over 100lbs of thrust, about like a small BT. It's pushing the bow where there is little keel. Im sure someone has tried it, somewhere.

Man you people don't like to think outside the box...
http://www.cabelas.com/cabelas/en/te...009&hasJS=true

http://www.thrusters.com/thrusters/dcthrusters.html
So the real bow thruster is 24 volt and the redneck bow thruster is 36 volt. Anyone know how to convert foot lbs to HP?

Last edited by wildcard; 11-30-2006 at 06:59 PM.
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Hello wildcard:

Who knew you would get such abuse.

I think that some may be overestimating the thrust needed to move the bow laterally. A little thrust applied continuously is what is wanted. Even in large vessels, bow thrusters generally don't develop a lot of horsepower, and an electric trolling motor that will produce 100 pounds of thrust could be quite effective, depending on the boat.

There are two problems; (1)mounting and (2) stowing when not in service.

If all else fails, you can put one of those little swivel seats that they put in bass boats on your foredeck and fish!
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Now thats a damn fine idea! A casting platform.
I tried putting my wife on the bow with a paddle, not such a great idea, never arm the crew.
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http://www.max-power.com/product/compact.htm

This costs just a few hundred more and will do the job
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Plus haul out plus install plus another hole in the hull plus is't for more flat bottomed boats.....I can't believe how short sighted some people are. OK, yes I can.
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Old 11-30-2006
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btrayfors:

"I think compressed air is the way to go, something like the air brakes on an 18-wheeler.
Small holes in the hull, big push, big bubbles, scare the hell outta the fish"

Actually, that's not really a bad idea, rather than boring great horrible holes in the bow, all that's needed is a couple of maybe 3/4 inch holes with appropriate fittings connected with high pressure hoses to a high pressure compressor. HHHHmmmmmmmm.
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Old 12-01-2006
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Not that I would ever install a bow thruster, I believe that (except for those that have to dock with high currents/winds and those that have to fit a 45' boat on a tight 30' slip), if you can't "park" your boat, maybe you shuldn't be "driving" it, and a smaller boat would be better.

WC the bow thruster I was kindly showing you is for any boat (mine happens to be flatt from bow to stern, but that model can be installed even i V shaped hulls), because it is installed facing down and the cutout actually works as a lid (covers the whole), and is retractable.

Another reason I don't have one is weight in the front, don't need it....

As for installing it is pretty easy, and the whole thing costs less than one might think. I posted the link because you posted the link with the price, so I was showing that your idea (not discussing if its good or bad) costs almos the same as the real thing.
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The desire for a bow thruster has nothing to do with the NEED for a BT. I have run some big boats through some small holes many times without problems with no BT. I asked a simple question, Has anyone done this and I get a bunch of smartassed answers from people that are unable to think on there own. I imagine the first guy to make a cement boat got the same sort of comments.
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Old 12-01-2006
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cheap push

Wildcard
You might be on to something here.

I have noticed in any thread where the topic of bow thrusters comes up there is a lot of negative comment. There seems to be some sort of "Real sailors don't do bow thrusters" mentality. There was a thread a while back asking about the topic and the poster was promptly acussed of being handicapped. Turns out he had suffered a stroke and had difficulty with brute force docking manouvers, prompting apologies all around.
I can understand your reluctance to toss a couple of grand or more at the chandler then the same again at the boat yard just to have two ruddy big holes poked in your hull, and extra batteries, and wires the size of a horses' leg, and finding out the thing is drawing way too much current because it is the home of an entire colony of a particularly tenacious marine growth.
I can also see a few problems with the trolling motor approach but most of them centered around what to do with the thing when you are not actually using it, and in the case of my boat, where to mount the thing, my foredeck being crowded already.
I am getting the feeling you are not talking about a 40+ footer, that would be just silly, and you don't sound silly.
The idea of using a tractor type of propulsion for sliding into the slip is interesting as opposed to the usual pusher arrangment. Look what they are doing with Tug boats lately. Docking with the conventional system wherein directional control astern is is only available with a little too much sternway (unless you count propwalk which almost always seems to be in the wrong direction for the space and approach available) always seems to me to be like trying to perfect an art with enormous handicaps. I do watch openmouthed when I see it done sweetly but my blood pressure always goes up a bit when I see a pannel of judges on the dock during my approach.
I say go for it. There are a few complexities all right, but if it was done well it could be really slick. I imagine a neat clean bracket that fits up under the anchor rollers. If you have a self bailing anchor locker you could even separate the 'head' of the unit from the shaft/drive assy. and have everything but the drive swivel 90 deg. and retract into the locker alongside the hull out of the way. With 360 degree swiveling you could use it to get quite fancy in your manouvering, if there was't too much wind or current, and used merely as a thruster I'm sure that 100 lbs. of thrust would do a lot of good. I would be surprised if many people could pull more than 50 lbs. horizontally.
Incidentally, I believe that the thrust they are referring to in the specs you gave the address for is measured in pounds, not in foot pounds. Thrust measuments are simply push (or pull) and are measured in pounds, ounces, grams, kilograms, tonnes etc. Foot pounds (newton/meters etc.) are measures of thrust at a distance from center, ie. torque or twist. Horsepower is a measure of torque times revolutions over a unit of time which is, in it's pure form, the ability to achieve a certain amount of work in a certain amount of time. Crossing thrust over to HP. is fairly complex since there are so many variables such as the medium you are thrusting in, the efficiency of the machine (prop, jetdrive, wheel etc.) there are tables but they are only approx. It would be better to compare by power consumed or watts, (volts X amps). Watts are directly transferrable to HP. 1 HP = 745.6999 Watts.

Let us know how you do, this does have possibilities if done well.

fair thrusting to ya'
Feetup
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