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Re: Homemade outboard motor using briggs 2hp

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In Reply to: Re: Homemade outboard motor using briggs 2hp posted by KenOhki on March 04, 2003 at 13:17:09:

Think I posted the first one to the wrong place..btw the bearing are not really desinged to take a sideways force, but they look pretty rugged and might handle a couple hundred pounds without too much trouble
Making the set screw holes might work fine, these are like industrial grade bearings, the spec. sheets on them actually gets into the 1000's of pounds capacity. The reason I got them was because they were the only ones I could find. So I am thinking I will try the holes first rather than deal with a thrust bearing adding to this design. As for the math, I dunno I am just thinking back to high school physics I think. They numbers could be way off and it was kind of odd that it did not account for boat mass. The truth is, I do not have a boat lol. I plan on putting this in a garbage can full of water to test it and if I am lucky maybe I can rent a skiff to try the motor out on or maybe somebody else will test it out for me on thier boat. I figure the boat plus people (up to four) and everthing might be like 700-1000 lbs, pretty heavy for that little motor but then again it doesnt have to push it that fast. (the reason i came up with 5 mph is because that is the harbor speed limit, I want to be able to keep up with traffic so we dont get run over by some huge yacht). Piping the exhaust to the water is a great idea, the motor is going to be louder than your normal outboard. I wonder if piping it to the water would make it quiter. Are exhaust threads on these things pretty standard? I wonder if a threaded copper or plumbing pipe would screw right in where the muffler goes.

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Re: Homemade outboard motor using briggs 2hp - KenOhki 18:47:32 03/04/03 (8)
hehe,
well, a boat that can hold 4 with a mass close to 1000 pounds, Yeah, thats allot to ask of a home made 2 hp, but what the hell, A prodject is a prodject hehehe. Figure out a portable padlewheel device and simplify the whole process hehehe. But It appears you are aware that you are building a motor that is way underpowered for the aplication its being applied too. But it will move the boat, I am getting the impresion that you are gonna run this in a Bay?. Might not be strong enough to fight current. I was thinking this was gonna be a pond lake aplication..
I am not sure of the threading for the muffler, But I am sure a simple adaption can be had, ANd it will definitly quiet your noise level allot. When do you think you might actualy have this together? It seams that most of the problems have been addressed?
- Re: Homemade outboard motor using briggs 2hp - machnumber2 16:51:35 03/05/03 (1)
  I think everything is about a done deal and its ready to build. I am going to home depot in a bit to buy some threaded pipe, hopefully not too hard to find what I am looking for. Hopefully be welding later tonight, if all goes well I hope to have a running motor outboard in a couple of weeks or less. Btw, this harbor isnt really like a bay, its like a small city where houses back right up to the water and have a dock in the back yard, the channels being organized like streets-the water is always flat. But some places you go out into the main "streets" and meet up with larger traffic where you have to be more careful. Thanks so much for your input and advice Ken. Wish me luck, I will post photos maybe tonight of the progress.
  - Re: Homemade outboard motor using briggs 2hp - KenOhki 19:15:47 03/05/03 (0)
    Thats cool, good luck with your prodject.Np on the advice. Making things do what I want them too as oposed to what they are designed to to is a hobby of mine.
- Re: Homemade outboard motor using briggs 2hp - outboard vision 15:04:38 03/05/03 (5)
  Hey there guys I just wanted to chime in here. I have read all of the messages on this discussion. I have been searching for a way to make an outboard out of my old lawn mower engine. I have a 3HP briggs & stratton. I have an old flat bottom jon boat.
  - Re: Homemade outboard motor using briggs 2hp - machnumber2 23:07:04 03/05/03 (0)
    Sketch up what you have planned I would love to see it. Do you have a vertical or horizontal crankshaft motor to work with?
  - Re: Homemade outboard motor using briggs 2hp - KenOhki 19:20:49 03/05/03 (3)
    Maybe you should start a new thread if you are seriously looking to do this. Wouldnt want to get the prodjects confused by starting a new one in the middle of this one. So start a new Post from scratch, and tell me a little more. how big a boat, weather you want inboard, outboart or something Unique. How much money you have to spend, and what parts you might have on hand.
    - Re: Homemade outboard motor using briggs 2hp - machnumber2 23:18:21 03/06/03 (2)
      Finally started some welding tonight, a bit concerned about a few things..
      1. my welding is pretty bad hehe
      2. the pipe that I am using is galvanized something welded to steel, hopefully these things weld ok
      3. my welder is for small hobbies stuff like that so it may not be as deep as it should be.
      Anyway I was happy the see a general form start to take place. The link below shows some photos of the progress-double click the small photos to see larger ones...
      http://machnumber2.50megs.com/photos/outboard2/photos/outboard.html
      
      http://machnumber2.50megs.com/photos/outboard2/photos/outboard.html
      - Re: Homemade outboard motor using briggs 2hp - KenOhki 12:32:51 03/07/03 (1)
        
        In Reply to: Re: Homemade outboard motor using briggs 2hp posted by machnumber2 on March 06, 2003 at 23:18:21:
        
        Looks like your on your way. I think your hobby weilder should be enough to handle it, but I am not the one to give welding advice,, I gorrilla weld myself, but my welds do seem to hold.
        From your pictures. The only warning light that went off in my head was about the motor mount.With such a small motor, it might not be a concern, However it appears to me that the weight of the motor will have a good deal of leverage against the transom. All outboards hang over the back, this is true, But they also are much closer to the transom, and in some cases even overhang into the boat some. Your mounting plate looks like it is overhanging the rear too much. The further away from the transom you mount, the more you will amplify any stress created by weight and motor thrust.. I realize its a little late for magor design changes, But I think this could be a Important design flaw you might want too address before you go much further. I bet you have a formula kicking around someplace in your head to figure how much leverage 50 pounds or so will gain at the end of a 1 foot arm. Is there any specific reason it is so far out?
        Keep us posted and good luck with it.
        
        Re: Homemade outboard motor using briggs 2hp - machnumber2 19:18:16 03/07/03 (0)
        
        In Reply to: Re: Homemade outboard motor using briggs 2hp posted by KenOhki on March 07, 2003 at 12:32:51:
        
        I think I am going to start a new post because we are getting kinding far to the side here...same name outboard motor

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