My Homemade Submarine

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This is a video about my homemade submarine, which I've been working on off and on for the last 2 years. I'm planning to make some videos with it in the coming weeks, so I thought it would be a good idea to do an introductory video about how i designed/built it.

It's a "semi-wet ambient" type submarine, meaning the pressure inside is the same as the outside water pressure, and the cabin is partially flooded. The pilot and passenger sit in a bubble of trapped air underwater that's equivalent to pushing a cup upside down in your sink, similar to a diving bell.

Power for propulsion, pumps, and lights is provided by a pair of 12V / 100AH lead acid batteries, which are sealed off against water entry, and have their terminals potted in rubber to prevent corrosion (in future videos, the batteries will be series-connected for 24V). Pneumatics for cabin air and buoyancy control come from a pair of 120 Cubic ft steel air tanks pressurized to 4,000 psi. I have an adapter that allows me to connect regular hardware store NPT fittings to the diving regulators on the tanks.

Motors are 12V/30A saltwater trolling motors made by newport that allow me to cruise at about ~3 knots surfaced and about 2 knots submerged. In future videos, I'll be running Turnigy 6374 brushless outrunners specially modified for underwater use with 7.25x5 3 bladed props.

My hope is to eventually use this sub to explore reefs and shipwrecks along the Florida coast.

Music:
Serge Pavkin - Intergalactic
Serge Pavkin - Fractal
Heatley Bros. - Dimension Drift
Serge Pavkin - Universe

Hyperspace Pirate

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When I was done watching this video I expected a channel with millions of subs and I was really suprised. This channel deserves more

insert

It’s mindblowing how someone can accomplish this and not die

madvmgames

First of all, congratulations on your maiden voyage, super cool and unique project you got there. But for the love of god, please don’t go out there alone. Most Scuba divers even without all the experimental things at work here, strongly prefer diving in buddy systems and that should be a nobrainer here as well.

jonasghafur

For all that is holy, if you're going with an open system, add manual weights you can disconnect 1 at a time for controlled emergency assents, and in the event of a full tip over from underwater currents, which can get surprisingly strong sometimes and they're basically invisible, you need to install enough supplemental air to breath during your assent to prevent getting the bends (or drown).. Just stick a divers chart inside next to your depth gauge so you can guesstimate your (safe*) climb rate. I presume you know this, but if you plan to go below 30ft, things can get life threatening (*from the nitrogen in your blood stream) *beacuse if you have to go back up too fast because you lack enough supplemental oxygen, you can still die. (I'd install 2 flags on the sides of the sub that read "Submarine In Distress" with perhaps some instructions on what you want them to do, with little LED strobes for visibility, and waterproof two of those keychain alarms so you're also heard, attach them to something that can allow them to float upright, and give them long tethers so you can manually pull a pin to release them to signal for help on the surface if you ever need to, this would provide a cheap and efficient means for rescuers locate you and even possibly pull your rig back up if the tethers strong enough, and then it'll double as a "WATCH OUT" signal whenever you're returning to the surface for boats. Cheers.. I'm about to go down this rabbit hole myself, but IDK about the open concept, then again I don't intend on going beyond maybe 100 feet (probably less).

TrueHelpTV

I can't believe YouTube is only just now showing me this. Really cool! Slightly terrifying watching the water fill up like that internally though.

McTroyd

Seriously impressive, I'm looking forward to the future videos!
Side note: It might be worth looking into some pony bottles for the two compartments as an emergency backup source of air to surface with.

spark_EE

Yikes! Yeah, seal the electronics with triple redundancy when it comes to the stuff that keeps you alive. Side project suggestion - find out how to remote pilot the sub for the dive/surfacing tests before live crew. Maybe an auto timer? Might not be a bad idea to set an auto timer to surface in case of getting accidentally knocked out somehow (outside hit, unexpected medical issue, etc.) and a backup 'air bags' to surface you in case that fails.
Also, you and PeterSripol heading to Florida this month (or the next). One doing solar power above the water and one going below. Be careful not to bump into him from below!

curiousviewer

Oh my god. From the thumbnail i thought it was a small rc vehicle. I was shocked that it's actually manned (and a two seater at that).

volbla

Very cool. Yours is one of the best channels on YouTube because there’s a huge spectrum of Scientific, Engineering disciplines rolled into into highly entertaining and educational video.

Be careful not to let the DEA or US Navy mistake you for someone moving contraband. You are one of a small few with a channel worth anyone’s time. So we can’t have Big Brogher firing torpedoes or depth charges at you.

TheElectronicDilettante

3:24 I remember doing this in my bath, it was a amazing experiment. Keep it up! You made me get some inspiration!

Badhumortophat

As someone toying with the idea of this pursuit, I really applaud your work. Nice job!

simonblack

You might want to consider pressure compensating your motors and electrical system. Mineral oil is non conductive. You fill the motors and any electrical boxes with mineral oil then run feeder hoses to a compensator diaphram. One side of the diaphram is closed and attached to the oil system while the other is open to the water. When you descend the water pressure pushes on the diaphram which pushes on the oil which is non compressable. This pressurizes the oil the same as the outside water so you only need o-rings and seals good enough to keep the oil and water separate and not to withstand pressure.

the_omg

Oh, boy. I wouldn't get into my own underwater diy projects without an emergency team that scoop me out when things go south.

SuperRylee

Wow, you went out to test this thing with no backup help? OMG! This system works great but i dont wanna get wet and cold. But i understand why you went with this design :D

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