Construction How do you build a self-submersible boat?

AI Thread Summary
The discussion centers on creating a self-submersible boat using a plastic bottle without electronics, focusing on mechanisms for it to resurface autonomously after a few minutes. Key ideas include increasing the bottle's volume by dropping weights or using flaps, as well as the potential for weights to escape. Suggestions include utilizing an internal water ballast tank to manage buoyancy and employing baking soda as a propulsion method, similar to toy submarines. The conversation also touches on enhancing the reaction speed of baking soda by combining it with a dry acid powder, which could initiate a quicker reaction when in contact with water.
Monom
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So I've been thinking for a long time now about making a self-submersible boat out of a plastic bottle without electronics. It should resurface by itself after a few minutes. I was thinking that it might increase its volume. By slowly dropping weights down the bottle and opening flaps on the sides of the bottle. But weights could also slowly escape from the bottle. Anyway, I'm looking for ideas and thank you in advance to anyone who pays attention to me.
 
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Monom said:
So I've been thinking for a long time now about making a self-submersible boat out of a plastic bottle without electronics. It should resurface by itself after a few minutes. I was thinking that it might increase its volume. By slowly dropping weights down the bottle and opening flaps on the sides of the bottle. But weights could also slowly escape from the bottle. Anyway, I'm looking for ideas and thank you in advance to anyone who pays attention to me.
Welcome to PF. :smile:

Do you mean like these baking soda powered toy submarines?

1652292119842.png

https://www.teachersource.com/product/diving-submarine
 

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berkeman said:
Do you mean like these baking soda powered toy submarines?
Wow! I had forgotten about those. They were great toys.
 
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Monom said:
But weights could also slowly escape from the bottle.
Buoyancy all comes down to total vessel density. You might include an internal water ballast tank, with sufficient internal air pressure that it will drive the water out through a small bleed-hole, as used for drip irrigation.
A pack, or a block of salt, will dissolve in the water over time, until the vessel floats. But that will not repeatedly sink and surface, like the CO2 bubble produced by baking soda.
 
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berkeman said:
Willkommen bei PF. :smile:

Meinst du wie diese mit Backpulver betriebenen Spielzeug-U-Boote?

View attachment 301357
https://www.teachersource.com/product/diving-submarine
Ich habe schon über Backpulver nachgedacht, aber es kam mir nicht in den Sinn, es auf diese Weise zu verwenden. Vielen Dank!

[Translation via Google Translate by a Mentor]
I've thought about baking soda, but it never occurred to me to use it that way. Thanks very much!
 
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