Bronco Type XXIII build

[bigdave]

Re: Bronco Type XXIII build

I never use them. BD.

[bigdave]

Re: Bronco Type XXIII build

I was doing some guesstimating on the size bladder that I would need for the 23 and found my small was too small, and the medium to large.
It would work but I decided to take another approach.
Using a hard tank for the RCABS R system.
I had never done this before as you have to be careful you don't get water sucked back into the pump system.
My buddy Crazy Ivan is working on a system like this for his Skipjack build.
So I decided to think on it for a while and came up with a tank design I will try in the 23.
Bench testing seems to show promise.
The operation is flawless and hopefully will not pose any problem at extreme angles.
I have a short video of the tank in operation.
I will post a few photos of the tank later. BD.http://m.youtube.com/watch?v=XXsUDzPJIUQ

[redboat219]

Re: Bronco Type XXIII build

how about installing a float valve inside the tank?

[bigdave]

Re: Bronco Type XXIII build

I guess you could but that would defeat the KISS principle.
Don't want to over complicate things.

I will draw up something showing the system.
CI is questioning my design.

[bigdave]

Re: Bronco Type XXIII build

Here is a photo of how the system will be placed inside the hull.
Starting from the bow, pressure tank, ballast section, ballast tank, control section. BD.

[bigdave]

Re: Bronco Type XXIII build

Here is the drawing.
I will write something later. BD.

[bigdave]

Re: Bronco Type XXIII build

The pump is in a common chamber (the inside of the ballast section).
So it is pulling air from the inside of the ballast section which is connected to the anti syphon tube inside of the ballast tank.
The anti syphon tube pulls air from the top of the ballast section.
The pump can only pull enough air to fill the pressure tank which equals about 2/3 of the ballast tank in volume.
So when the ballast tank is at max pump pressure (to fill the pressure tank) the ballast tank is only 2/3 full.
If something were to happen the anti syphon tube would have to fill to the point where the air input was drawing water.
Even then the water from the anti syphon tube would enter the common air space in the ballast section.
It would have to fill to the point where the pump could suck the water.
So the odds are very good for the pump never seeing water.
Maybe incalculable.

[redboat219]

Re: Bronco Type XXIII build

I'm intrugued by your anti-siphon device...can you post actual photos.
Thanks

[bigdave]

Re: Bronco Type XXIII build

I thought I had.
CRS again I guess.
I will post some photos when I am on the laptop.
It will not totally stop the flow back of water but under normal running conditions should be sufficient.BD.

[Guest]

Re: Bronco Type XXIII build

If you run a system with an exposed water surface, vented to outside water pressure, it will compress when you dive deeper.

My first sub had a system like this, and it had probes mounted in the tank to shut off the compressor before the water level got to the point where it would flood the main compartment.

Worked well enough at shallow depths, but once you went below about three feet, it became impossible to retain accurate trim. The current OTW modules use the same system, however they replaced the compressor with a water pump, and because it also includes a shut-off valve, it doesn't suffer from this problem.

[bigdave]

Re: Bronco Type XXIII build






A few more photos to show.
How the battery will mount.
The Lexan tube inner stiffeners.
How the front and rear sections assemble.

[bigdave]

Re: Bronco Type XXIII build



Here is a photo of all the components sitting in the hull where they will go. BD.

[thor]

Re: Bronco Type XXIII build

Dave,

This is a magnificent piece of engineering my friend. Well done! I can't wait to see it in action.


Matt

[redboat219]

Re: Bronco Type XXIII build

Your ballast tank set up looks like it can be converted to a vented tank/ LPB system.

[bigdave]

Re: Bronco Type XXIII build

Since it is a closed system you would not want to add any extra air.
There is no vent. You would never submerge. BD.