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The plastic is a bit heavier than water and should sink, however in practice I have experienced that 2x4 bricks (and the like) have a tendency to trap air inside them and actually float rather well. It probably isn't failsafe, however for shorter periods of time (like a half to a full hour) would probably work fine. (I haven't actually tested the time it ...


A few years back there was this solid single-piece hulled police boat which would float. There was also a small red boat (pre-2000) that came with part of a pirate set (I believe, anyway) As for building a boat from scratch...no. It tended to capsise then sink (somewhat impressively). Place 2x 4x2 bricks on another and place in water, they only float on ...


i had a police-boat when i was a child that had a one-piece-body, so it was watertight and able to swim: there are some other LEGO-boats with similar bodys (even some bigger ones) that should also be able to swim.


In my experience, this doesn't work very well. The gaps between LEGO bricks are too wide to hold water. The water will be contained for a short amount of time, but it will eventually leak out through the cracks. Here's an experiment showing how your first example works. Notice the water leaking out the crack in the bottom right: The leak continues to ...


I would try liquid latex (liquid frisket) which you can buy in most art supply store. This will not damage the bricks and is easy to peel off. You can apply it using a cheap throwaway brush, either in between the bricks (like a cement wall) or as a thin transparent layer on the whole hull. I recommend the second method because it's fast, straight forward ...


My kids had Captain Redbeard's Pirate Ship - it certainly floated in the bathtub! I believe many of the other Lego pirate ships could float, particularly if they had molded single piece hulls - see this list.


In addition of the various boat hulls, you can use pneumatic tanks for extra buoyancy. If you want to motorize your boat, keep in mind that means extra weight, which has to be countered in some way.


There is another not mentioned way to achieve flotation. My kid discovered it today with his "water bat": surface tension. The long flat wings did the trick : ) It is not exactly due to the buoyancy of the bricks themselves as wanted in the question, but might help as a complement. For more on the Physics underlying: Surface tension


I did something like this once, I cut down a butter tub and built the lego around it, with plates hiding the top edge. It worked very well, but the stale tea that I used for the swamp stained my bricks. I can only think that a brick-built wall with a plastic carrier bag secured by a plate layer at the very top would be your best bet, as none of the bricks ...


For a very small "boat" - something like a 4x8 plate with 1x8 and 1x2 brick sides it might stay afloat for a short amount of time before the leakage takes it down. For larger stuff, LEGO is just too heavy when you get in to building the necessary structure for a real boat. There were some sealed-hull boat sets I remember from childhood that were designed to ...


Already a correct answer accepted, but... the original question seems to be "do Lego bricks float by themselves?" Most Lego bricks are made of ABS plastic which has a specific gravity greater than 1 (but only slightly). So, they are heavier than water and will not float naturally. You can get small bricks to float initially since small bubbles cling to ...


Yes, if built carefully. When I was a kid I made a number of lego boats to play with in the tub, and later in the pool. The main thing I remember was to make the hull upside down and out of at least two interlocking layers. Lining the inside with plate also helped.


My children play with the lego fishing boat (see picture) in our bath tube. This design does have a serious flaw (imo). Even if there are very small water waves in our bath tube, water enters the boat which then becomes to heavy and sinks. So if you are planning to built your own lego boat i would make sure the sides are high enough to prevent water from ...


I would tend to suggest another non-waterproofing solution - build something to hold your ship from underneath, that will safely rest on the bottom of your pool. Of course, if you don't want it to show on the picture, you'll have to be extra careful about how you do it, but I think it's the simpliest solution. What I would do is buy a large plexiglass ...


Maybe you don't need to waterproof it. If you are able to fit a block of foam (eg. extruded polystyrene) inside the hull, that will probably be enough to ensure flottability.


Try spraying the inside with plasti dip, it goes on like spray paint or you can use a cheap paint brush, then you can peel off as one whole piece. Best of all it comes in many colors! Get it here www.plastidip.com they also sell it at most home improvement stores.

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