Physics Project: Mini Electric Motor Boat


Introduction: Physics Project: Mini Electric Motor Boat

For physics, I had to construct a boat that would successfully race down a 3m PVC track. We had limits on the dimensions, as well as the total voltage of the battery. The boat is really ugly, but it is fully functional. I attempted to model it after a catamaran, but it was no where near being the fastest in my class. It is made mostly of pink construction foam and hot glue.

I did not pick the paint, my partner did because I didn't care. It is also her handwriting on the boat.

I KNOW IT'S UGLY! But please feel free to ask questions or post comments.



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    66 Discussions

    What Reynald's Number did you expected before building it? And what were the results? I have got a really huge number which is around 100 K.

    - Do you have an explaination for it?


    Bhai.. Aisa model hi kyu bnaya... Agar banaya bhi to picture kyu dali net pe.. Samajh to aa nhi rhi.. Ek kaam kro.. Ek katora lo Aur bheekh mangna shuru Karo.. Tum usi layak ho

    3 replies

    He is asking for help, and instead of appreciating, ap usko ase bol re ho.

    If appreciate nhi kr skte toh its better not to say something bad.

    Mey Instructables dekhta hu , aj tera comment ko reply dene ke liye account oprn kiya ROHITR9 .

    Log ko chota maat kar yaar . Kisi ko karne se kohi bara nahi banta . Usko inspire kar , shayad usne ek din hamare samne kuch award winning project la sake .

    It is good but how to make it is still not clear to me plz help as soon as possible I need to make a science fair project

    hie ..i want help frm you
    plz help me in d motor boat ..i dont know wat to do ...can a motor boat be made with a thermocol nd how ?..
    can u plz explain wid the steps to fix it ol..
    plz let me know as soon as possible :)

    don't know if this one will help... i'll post soon our model of this type of boat...
    we do racing here in our place using only mini 4wd motor here's the link if u want to see how it runs...

    Sorry, I don't really know. It was  from a Hobby Shop and the packaging was all in Japanese so I didn't have a clue what it said. The motor reads "plasma 4WD". It took 4AA batteries to power it. The propeller was from the hobby shop too (premade).

    Thanks. It's ok. I'LL try cutting something or use a mould to make the propeller. I'VE GOT the circuit done and the motor is spinning quite I think it can run at a good speed. Was ur boat quite heavy? 

    Our motor rattled against the foam and made a really loud sound that was quite irritating. You should post a slide show when you're done!

    I would seriously comment on the circuit. First of all, the circuit will drain off the cells in a few minutes. My next point is that if there was an accident was to occur, as worst-case scenario would be if the batteries got submerged in the water and the casing melted causing fumes to produce. You can get a casing for all of this that is water-proof.

    Nice project. What did you use for the shaft? And how did you attach it to the motor? 

    2 replies

    Thanks! We found white plastic straws at the hobby shop, as well as a flexible rubber coupling that the propeller screwed into, and the other part went around the spinning part of the motor. (The propeller was attached to a metal stick.) I accidentally broke it while trying to change the battery to video tape it, so I'll disassemble it and take pictures of it to show you. The design wasn't the best (and it was ugly :)), but it didn't splash and it ran really straight. My teacher specifically commented on these elements (they were outstanding compared to some others that thrashed through the water). Unfortunately, however, the battery ran low (and I didn't want to break it trying to change it) and the overall design made it slow (methinks). :( Well, all that matters is that it worked, we just didn't get the extra credit for having the fastest boat. Sorry to make this so copious, but if you have any questions, I'd love to answer them to the best of my ability.

    Ooh, cool. I'd love to see the pictures. Well, the design doesn't always have to be the best, if it works, it works. One tip though.. You should have made the batteries easier to get to XD.