Scopio's Submarine Adventure

[scopio90]

Hi All, 

This project has been going on for a while now (started late last year) but I'm finally getting some of the prints out from CAD and onto the printer. Feel free to follow along as I progress this with updates.

[daveefordays]

Looking forward to your updates!!

[scopio90]

What I hope it will look like one day.

So some stats firstly:

Estd ship length: 475mm
hull diameter: 69mm (OD - outer diameter), 62.85mm ID (inner diameter)
estd ballast tank volume: with r = 31.4mm, cylinder height = 89mm gives V = pi * r^2 * h = 275.668ml or appox 275gr.
dry weight: to be determined (should be around 1.2kg)
estd weight of displaced water: approximately 1.7kg. This will be refined as more information comes to light.
COST: will tally up on completion. Early Estimates came in around $AU 75, but like all projects, I'm sure it's blown out to over $100.

This means I will have to place some ~500gr weighted ballast so that the sub can actually sink and float using the Ballast Tank. 
Here is a very handy link all about that subject: https://www.rcuniverse.com/forum/rc-subm...olume.html
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This is what it looks like in CAD currently. I'm using TinkerCAD as its free, easy to use and has cloud storage. It's my first full dive into the world of CAD having minimal experience with solidworks. For a free program, its pretty powerful though for better CAD software I would suggest Fusion360 or people can use their own favourite flavour.


The main hull is being fashioned from two pieces of PVC pipe bought by the meter from the local hardware store. OD = 69mm and ID is 62.85. Below you can see the black/darker section is 114mm ballast section. The white front section is a 150mm piece which will house battery and dive planes, including the RX comms and ESC. The nose cone will be removable for access to quick replacement of battery.



Thats all for this update but in future I will cover (in no particular order):
- Bulkheads
- Diving Planes
- Battery system
- RF / Ultrasound Comms link (I'm experimenting with Arduino|PPM|ultrasonic comms, but have 40Khz, 27Mhz, 433Mhz, 915Mhz and 2.4Ghz options.)
- Ballast System
- The power and ESC link between front and rear of the sub (I call the underbelly)
- Addition of Flight Controller?... (allows for lost RF signal to initiate Emergency Rise function.)

And hopefully some pictures of the progress as it trickles through.

Stay tuned!

[daveefordays]

What I hope it will look like one day.

So some stats firstly:

Estd ship length: 475mm
hull diameter: 69mm (OD - outer diameter), 62.85mm ID (inner diameter)
estd ballast tank volume: with r = 31.4mm, cylinder height = 89mm gives V = pi * r^2 * h = 275.668ml or appox 275gr.
dry weight: to be determined (should be around 1.2kg)
estd weight of displaced water: approximately 1.7kg. This will be refined as more information comes to light.
COST: will tally up on completion. Early Estimates came in around $AU 75, but like all projects, I'm sure it's blown out to over $100.

This means I will have to place some ~500gr weighted ballast so that the sub can actually sink and float using the Ballast Tank. 
Here is a very handy link all about that subject: https://www.rcuniverse.com/forum/rc-subm...olume.html
------------------------------------------------------------------

This is what it looks like in CAD currently. I'm using TinkerCAD as its free, easy to use and has cloud storage. It's my first full dive into the world of CAD having minimal experience with solidworks. For a free program, its pretty powerful though for better CAD software I would suggest Fusion360 or people can use their own favourite flavour.


The main hull is being fashioned from two pieces of PVC pipe bought by the meter from the local hardware store. OD = 69mm and ID is 62.85. Below you can see the black/darker section is 114mm ballast section. The white front section is a 150mm piece which will house battery and dive planes, including the RX comms and ESC. The nose cone will be removable for access to quick replacement of battery.



Thats all for this update but in future I will cover (in no particular order):
- Bulkheads
- Diving Planes
- Battery system
- RF / Ultrasound Comms link (I'm experimenting with Arduino|PPM|ultrasonic comms, but have 40Khz, 27Mhz, 433Mhz, 915Mhz and 2.4Ghz options.)
- Ballast System
- The power and ESC link between front and rear of the sub (I call the underbelly)
- Addition of Flight Controller?... (allows for lost RF signal to initiate Emergency Rise function.)

And hopefully some pictures of the progress as it trickles through.

Stay tuned!

Very interesting, I would like to see how your ballast tank setup works to dive and rise again?

Looking forward to seeing this thing finished

How many of the parts have you actually 3D printed so far? and will you share the models so others can build a sub like this eventually?

[scopio90]

Very interesting, I would like to see how your ballast tank setup works to dive and rise again?

Looking forward to seeing this thing finished

How many of the parts have you actually 3D printed so far? and will you share the models so others can build a sub like this eventually?

Yes, the ballast tank setup will have its own update once I test it and confirm its smooth operation.

At last count not including the two stands I have printed for the sub to rest on I'm looking at 31 parts printed with two more to go. A lot of these are small 20 x 30mm parts which are located in the front of the sub with the intent of preventing water ingress into the hull but we'll see how well or not that ends up working.

Once everything is working correctly I will put the models up on thingyverse for all to use if they want to build a sub of their own. So far this has been a few months and iterations of design to this point.

The versions so far have been:
1. A dynamic diver using a water pump to empty the ballast tank

2. Next was a static diver with rack and pinion style mechanism. This was never printed.
3. Static diver Single screw piston version
4. Static diver Double screw piston version which is where we are at currently.


A great source of information with handy animations can be found here: https://www.rcshipyard.com/tech/

I changed from 1 to 2 screws design to limit any axial rotation on the piston head.

[daveefordays]

Yes, the ballast tank setup will have its own update once I test it and confirm its smooth operation.

At last count not including the two stands I have printed for the sub to rest on I'm looking at 31 parts printed with two more to go. A lot of these are small 20 x 30mm parts which are located in the front of the sub with the intent of preventing water ingress into the hull but we'll see how well or not that ends up working.

Once everything is working correctly I will put the models up on thingyverse for all to use if they want to build a sub of their own. So far this has been a few months and iterations of design to this point.

The versions so far have been:
1. A dynamic diver using a water pump to empty the ballast tank

2. Next was a static diver with rack and pinion style mechanism. This was never printed.
3. Static diver Single screw piston version
4. Static diver Double screw piston version which is where we are at currently.


A great source of information with handy animations can be found here: https://www.rcshipyard.com/tech/

I changed from 1 to 2 screws design to limit any axial rotation on the piston head.

Wow, those diagrams are quite helpful. I do like the sound of your double screw piston design. Do you have an image of the printed piston setup or the 3D model for it?

Keen to see this dive (or sink, is there a difference?) 

[scopio90]

Wow, those diagrams are quite helpful. I do like the sound of your double screw piston design. Do you have an image of the printed piston setup or the 3D model for it?

Keen to see this dive (or sink, is there a difference?) 

I don't have any decent pictures of the double piston screw setup as its still undergoing design revisions, but i do have a CAD model of it:
The following snip shows the two screw axles in red. By having two screws, it should stop the piston face from spinning in situ instead of traversing the length of the piston track by the fact of having one screw only.


Here is a profile view to show the mesh of the gears. The outer orange cylindrical shape (which I call a bulkhead) braces against the internal of the PVC pipe. within that is a removable pinkish coloured inner section which is to keep the whole assembly together. The solid pink chevrons above the hex screw heads are plugs to keep the screws in place.



On to the gears themselves, below is one that I have hidden the gear so you can see the inside. A nut is inside each so that as the smallest gear turns both of the bigger shaft gears at a gear reduced rate for higher torque, this is translated to the nut in each shaft gear. Because the gears are held in place and spin, the resultant action is force on the piston face forward and reverse depending on direction of spin of the smallest gear. The dark grey pieces are bearings.


Whether it will all just bind up remains to be seen but it looks promising for now. See you in the next update!

[daveefordays]

This is a really intriguing design mate! I look forward to seeing it dive. I'm sure we will all get a youtube video on here

It looks like your design skills are quite good, fitting something like this together is very challenging.