Banner Ad 1

Bronco Type XXIII build

This is the place to post your submarine build- ups.

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 7:44 am

I never use them. BD.
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 11:38 am

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
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby redboat219 » Wed Jun 12, 2013 12:17 pm

how about installing a float valve inside the tank?
"Make it simple, make it strong-and make it work!" - Mikhail Mil
User avatar
redboat219
Registered User
 
Posts: 393
Joined: Fri Jan 14, 2005 4:07 am
Location: Philippines

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 2:12 pm

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

I will draw up something showing the system. :wink:
CI is questioning my design. :mrgreen:
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 3:45 pm

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.

Image
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 4:21 pm

Here is the drawing.
I will write something later. BD.
Image
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 12, 2013 4:54 pm

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. :wink:
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby redboat219 » Wed Jun 12, 2013 11:52 pm

I'm intrugued by your anti-siphon device...can you post actual photos.
Thanks
"Make it simple, make it strong-and make it work!" - Mikhail Mil
User avatar
redboat219
Registered User
 
Posts: 393
Joined: Fri Jan 14, 2005 4:07 am
Location: Philippines

Re: Bronco Type XXIII build

Postby Bigdave » Thu Jun 13, 2013 7:03 am

I thought I had. :roll:
CRS again I guess. :mrgreen:
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.
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Sub culture » Thu Jun 13, 2013 4:43 pm

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.
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
User avatar
Sub culture
SubCommittee Member
 
Posts: 2860
Joined: Fri Feb 21, 2003 6:55 am
Location: London, UK

Re: Bronco Type XXIII build

Postby Bigdave » Thu Jun 13, 2013 8:08 pm

Image

Image

Image
A few more photos to show.
How the battery will mount.
The Lexan tube inner stiffeners.
How the front and rear sections assemble.
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Bigdave » Fri Jun 14, 2013 4:29 pm

Image

Here is a photo of all the components sitting in the hull where they will go. BD.
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

Re: Bronco Type XXIII build

Postby Thor » Fri Jun 14, 2013 10:49 pm

Dave,

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


Matt
User avatar
Thor
SubCommittee Member
 
Posts: 703
Joined: Mon Feb 02, 2009 3:01 pm
Location: United States

Re: Bronco Type XXIII build

Postby redboat219 » Wed Jun 19, 2013 1:03 pm

Your ballast tank set up looks like it can be converted to a vented tank/ LPB system. :mrgreen:
"Make it simple, make it strong-and make it work!" - Mikhail Mil
User avatar
redboat219
Registered User
 
Posts: 393
Joined: Fri Jan 14, 2005 4:07 am
Location: Philippines

Re: Bronco Type XXIII build

Postby Bigdave » Wed Jun 19, 2013 3:35 pm

Since it is a closed system you would not want to add any extra air.
There is no vent. You would never submerge. BD.
David Welch
Commodore SR-8

Image


"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
User avatar
Bigdave
SubCommittee Member
 
Posts: 2846
Joined: Fri Feb 21, 2003 8:33 am
Location: Rochester NY

PreviousNext

Return to Builder Threads

Who is online

Users browsing this forum: Google [Bot]