Minecraft Semi-automatic self-reloading TNT cannon for ships

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Made with op commands at my disposal. This is a small 1-button fire-and--then-reload cannon designed to for ships. Hence, it had two objectives in its design, power NOT being one of them (resulting in a very short ranged gun).

1. Be small enough to be able to mount on the sides of a mid-sized ship, and not require a massive wooden behemoth. The goal was something around a low 20s block wide ship. This cannon would require around 23 blocks for it to be mounted on both sides of a vessel, so it worked out well enough in that respect.

2. Not make the ship ugly. No one wants their precious graceful wooden sailing vessel to have a whole bunch of ugly TNT, pistons, redstone, and sand-towers lying around. So naturally, the best place to stuff all that junk is below decks.

As a result of the design, this cannon's ammo capacity is not terribly high, and its power and range are especially lacking compared to some designs. However, if all you want is a functional TNT cannon that automatically loads its next shot a couple times, and you want it on your ship without it making the deck all ugly, then something along the lines of this cannon should work nicely.

The reloading mechanism is essentially a U-shaped mass below the cannon, and the current shot and propellant lie atop the next round, which doesn't explode due to the effects of water on activated TNT. The dirt is used to assist the upwards reloading a bit (you could just use more TNT too), and the sand serves the function of replacing blocks, and as an accidental bonus acts as a safety to prevent a potential misfire after it runs out of ammo. The dirt or whatever non-gravity block used also serves to keep the water from leaking back down from the cannon into the lower deck as well. Oh, you do need to reload the "ready shot" before going below decks and reloading the rest if you use dirt or you will end up digging into the water cavity. Not the simplest magazine replenish, but not terribly awkward.

On a side note, the cutaway piece-of-ship I built the cannon into as a concept uses a furled sails idea I stole from someone else's ships. Interestingly, most people who make docked vessels have their sails wide open, despite the general problem with that idea from a practical stand point. When I saw a harbor with someone who had done his ship with furled sails among all the other vessels docked around, it took a few minutes to figure out what was wrong with the picture.

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It can fit on a ship of suitable dimensions that has a lower story below deck. It won't fit on small ships.

SephirothRyu

more power, which means just adding more tnt to shoot the one block of tnt farther. pretty good though!

LegoEinstien

this is great but please make a video of it but with a second layer of tnt on the last rows this will make it fire much further

parteepro

True, its not a very powerful design, but if all you care about is getting a functional TNT cannon onto a ship's deck without making it ugly, it works.

SephirothRyu