Mini RC submarine ballast tank test 1

[chipmunkrel]

Ingenious

[thechoyster]

Where do you buy gears that have been threaded on the inside? What is the name/What are they called

[halofanatic1995]

really cool

[wpbunu]

Good idea!

[agouti6]

I've had an idea for an rc submarine ballast tank for years now, and I have always wanted to build it. This is exactly the way I imagined building it (great minds think alike...).

I'm going to make some of the hull stretchy/flexible to make air compression easier. Any ideas on what material I should use?

[marnix0steenbeek]

where is the ballbearing placed i cant figure it out plz help

[1kreature]

@marnix0steenbeek The ballbearings are placed recessed in the plate bolted accross the syringe-opening.

[marnix0steenbeek]

why does the little white gear wheel stay in place, what is keeping it from moving backwards or forwards? i am making a sub too and u have a really small design, mine is much bigger. (sorry for the bad englisch, i am dutch

[1kreature]

@marnix0steenbeek The white gear is firmly pressed onto a hub that inturn is pressed into the bearings.

[dynagravitomagnetic]

sherlock holmes - feenis pump - fully automated.

[transoceania]

too noisy

[oskar5140]

very clever :D

[dustinkervodka]

I'm also building a rc submarine for a school project. We have had thoughts of using this system.

[hurlingstar1]

@dustinkervodka Yeah,you'll get more credit from your teacher if you use ballast tanks.

[guitarerik93]

cool but i dont think the engine would be strong enough to compress the air :(

[1kreature]

@guitarerik93 The gearing ratio of this setup is very high so it will be up to your motor choice and battery voltage/amps if you can compress the air.

I've already tested it against a partial vacuum and it had no problems.

[shamrockl24]

could you make a video on how to make this?  i would greatly appreciate it if you did. my friend and i are building a rc submarine this summer and this would work perfectly

[marnix0steenbeek]

@shamrockl24 hey we are doing the same thing and we still don't know wich system we should use. the system in this video or a system with ballast tanks that will be filled up with air out of a compressed air pomp

[tsaikamho520]

real? i think so~ i want to make one . how can i make

[ollyk22]

Hi, can you give more details of the main gear / threaded rod used please? I want to use a similar system for dosing nutrients to a planted tank and other pumps are too expensive :)

Out of interest did you get this working in a sub?

[1kreature]

@ollyk22 Gear and motor was taken from the carridge assembly of a cdrom drive. The rod is a 4 or 5mm threaded nylon rod that I buy in 1 meter lengths. The main gear is attached to a small tube that is threaded inside to match the nylon rod. The tube rests further in a bearing that is attached to a crossbrace bolted on the end of the syringe. Nyon rod attached to plunger via backpiece of pusher,with extension of pusher cut off. Backpiece threaded and locked with extra nut. Rubber end pops on.

[ollyk22]

Thanks, did you get it working then?

[robotmotor]

great but its not take to much water

[sk8erdudejustin93]

so is it compressing the air behind the piston?

[1kreature]

No, the syringe is open and would be exposed to the internals of yoru submarine. Thus the entire air volume in your submarine is available for handling the extra air displaced from the ballast tank. This leads to much lower pressures.

I still suggest to overpressurize the sub so you won't have leaks.

[tgnjkl]

Simple and effective.

Excellent design and construction.

[1kreature]

Thanks.

I think the only way to make it even more compact is if I use a brushless motor with a tube instead of shaft. That way the threaded rod can pass through the tube and a nut.  The motor would then be about as large diameter as the syringe and only about 6mm tall. Brushless controllers are more fiddly than brushed though.