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Rebuilding an Outboard Motor | Boating Magazine

Olly Epsom build your own outboard boat motor 500 how and why! It will almost always be possible to buy a motpr outboard for. So why did I do it? Well, my motivations were as follows:. Because I have longer-term aims of making the system outbowrd build your own outboard boat motor 500 controlled essentially a drone, perhaps for wildlife photographyand for that I needed complete mastery youf the control system, which is achievable if I build it.

To embark on a project like this requires a basic knowledge of electronics and mechanics, but should be within reach buile most practical people with a willingness to learn. The voltages are low enough that they should not present an electrocution risk but take all appropriate precautions when working with electricity and moving mechanical parts.

My project utilised computer control and a lot of new-to-me equipment such as touch screens, Bluetooth, Arduinos and oscilloscopes. You may wish to structure your project differently � a significant simplification could be made by discarding computer control. I decided to use the bottom end of a conventional, second-hand outboard motor as the basis of the machine.

Above this, in place of the engine would be an electric motor, directly coupled to the driveshaft. Electronic control ypur would be mounted alongside the motor. I settled on a power of about 1kW because it is youf more than two rowers could achieve and would result in either a fast dinghy, or a dinghy with significant reserve power. Batteries cannot be fully discharged without damage, so to power this for a minimum of 40 minutes at full power would require roughly 1kWh of batteries.

But I am single hard to believe I know! These old engines had very build Build Your Own Outboard Boat Motor Job Description your own outboard boat motor 500 specification mechanical components and the gearbox in particular was in excellent condition. Usually they are slightly build your own outboard boat motor 500 efficient than permanent magnet DC motors as well, although in practice this depends entirely on the specific motors being compared.

Most motors 500 this power range run at 48V or. Likewise battery packs at 48V were more numerous. I settled on lithium-ion batteries due buuld their high capacity, low weight and high cycling ability. A 1kWh lithium battery is roughly 20Ah at 48V � about the same amount of energy held in an 80Ah car battery at a quarter of the weight.

MacMotor also sent me a speed controller, although that later proved to be less than spectacular and I had to replace it with a larger model. Arduinos are tiny programmable computers with analogue and digital inputs and outputs. They run bost 5V, consume an infinitesimal amount of power, and are of an inherently rugged, tough and reliable design. As a display I initially intended to use a cheap, rugged, reliable two-line, character LCD display of the buildd that are well known to work with Arduinos.

Whilst not as rugged or tough I was seduced by their sexy colour screens, with the ability to display multiple dials, graphs and buttons.

The one I bought came with a battery voltage indicator and miscellaneous switch that I figured might be useful. That said, the better equipped your workshop the better the finished product is going build your own outboard boat motor 500 be and, in addition, costs will reduce because I had to have a few parts manufactured that could be made at home in a good enough workshop. The first hurdle was to mechanically connect the electric motor to the donor outboard engine.

This connection needs to be secure and accurate. I measured up all mounting holes on top of the engine, and the mounting holes on the electric motor, and sketched up a suitable transition plate on the free online CAD software Onshape.

I could have sent it for 3D printing out of plastic. To connect the motor iwn the driveshaft I asked a friend with a lathe to turn down the uotboard of the approx 11mm spline and put an 8mm thread on outboatd.

I did consider collet-type connections or finding a matching female spline but the lathe option was easiest for me. The main disadvantage of this, however, is that every time the motor is removed it brings the motro with it, which makes reassembly quite a faff. The lathed spline screwed nicely into the 8mm female thread on the motor shaft, and a lock-nut completed the union.

Testing the assembled electronic components on the bench. Connect the three thick phase jotor from ouutboard motor to the appropriate colours on the motor controller. These are usually coloured green, yellow and blue.

Connect the sensor plug on the controller to the sensor socket on the motor. This will have at least five wires. Usually red and black 5V and ground and green, yellow and blue which take builf signals from the three outbowrd sensors in the motor. Connect the red wire on the throttle to 5V build your own outboard boat motor 500 available on one of the numerous outputs of the motor controllerthe black wire on the throttle controller to ground on the motor controller, and the third wire could be any colour to the speed input of the controller, which could also be build your own outboard boat motor 500 colour.

Finding which wire does what in a manual-free wasteland is very challenging. Some controllers may not have a 5V supply for the throttle and you may need to provide this separately via a 48V-5V DC converter.

This should not daunt you as they are easily available. In addition most controllers have a reverse function which requires connection of a switch. One such arrangement is shown in the schematic diagram above of the simplest possible control.

Build your own outboard boat motor 500 is the moment of truth. Connect the battery positive and negative to the motor controller positive and negative, and give the throttle a twist. At this point, assuming the motor turns, you uour essentially home and dry. All that remains is as many weeks of refinement as you bujld to deploy. Transition plate and connection between electric motor and outboard leg.

A word of warning: neither the motro, controller, Nextion display, charger or battery came with a shred of documentation. I used a multimeter and figured it out for. Zipping around Largs with the home-built electric outboard. Olly Epsom is a chartered engineer specialising in renewable energy, particularly wave power. Build your own outboard boat motor 500 bought Radioactivity, a UFO 27 which he cruises and races, in Based in Scotland, Olly enjoys the outdoors, promoting science and engineering at local schools, and running his own consultancy company, Moose Pyll Engineering.

Skip to content �. Home All latest posts. For most people, building your own electric outboard motor is unnecessary, time consuming, and may well result in a product that is both inferior to, and more expensive youf a new build your own outboard boat motor 500 electric outboard.

Well, my motivations were as follows: 1. There may be other reasons to embark on such a project, and if so, fill your boots. Unused petrol engine parts. Propeller and drive are to be retained. Original cooling impeller can be discarded. Scruffy, but well-built 2hp Johnson. The outboafd outboard motor stem.

Introduction DIY electric engine controller .

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Joined Mar 31, Messages Re: Homemade outboard Hey, I'm am currently working on a project like that. I have a 8 hp briggs vetical shaft that I am adapting to a 35hp lower unit. I know that sounds like overkill but it surly should hold up.

I have to finish the riser to mount the motor to the lower unit but I have a machinest at work so it shouldn't be a problem. My only consern is if the motor will have enough power. I think that there is enough room in there to mount a belt drive of some sort, but that would consist of a support bearing for the lower unit shaft. Anyway if it works like it sould I'll try to post some pictures. Joined Oct 17, Messages Re: Homemade outboard How's the shaker?

Vlad D Impeller Commander. Joined Mar 30, Messages 2, Re: Homemade outboard Lone Duck said:. How's the shaker? Joined Aug 10, Messages 14, Re: Homemade outboard Looks like fun!!! Joined Jul 30, Messages 2, Re: Homemade outboard How topical.

As I was looking at the ever corroding deck on my lawnmower yesterday I thought how much fun it would be to build an outboard out of it at the end of the season. Do you have any photos of the project? How did you connect the crank to the driveshaft?

Wee Hooker Chief Petty Officer. Joined Sep 11, Messages Re: Homemade outboard I always thought there could be a decent market for a "make your own " outboard kit. Re: Homemade outboard weldbilt17 said:. View attachment Re: Homemade outboard maxum said:. If so how did it turn out? Re: Homemade outboard wbeaton said:. How topical. Hey there, on the one that I made I made a plate to bolt to the top of the lower unit via the same bolt patern and board a hole for the output shaft.

Mount a trolling motor to a Homemade 6. Does about mph with two people. This video describes the a kayak with an electric trolling motor. The total cost of the battery box, trolling motor, battery, navigation lights, boat registr I made a boat motor for my canoe out of a craftsman string trimmer.

This thing is awesome! Lift it out. Unbolt and remove the blades and short drive shaft from the motor. Stick the long drive shaft in. Slide the hollow aluminum tube over the drive shaft and weld the top to the motor. Hold the propeller up against the bottom of the drive shaft and match up the gears.

Make sure that turning the propeller turns the drive shaft. Secure the propeller and weld or bolt it to the aluminum pole, depending on what sort of propeller you purchased.

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