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Long Distance homemade RC Sub - 8/15/2006 11:58:45 PM   
SubMan17


 

Posts: 2
Joined: 8/15/2006
From: , FL, USA
Status: offline 		I would like to build my own R-C sub but I am unable to find sufficent and effective wireless equipment. I would like something that could transmit at least 25 ft. below the surface, is this even possible? What type of freqency and equipment should I purchase and where can I purchase it. I will try anything to get the wires out of the way! Any help or expertise would be appreciated greatly. Thank You. My budget has no limit so any crazy ideas will work.

< Message edited by SubMan17 -- 8/16/2006 12:01:48 AM >
       Post #: 1

RE: Long Distance homemade RC Sub - 8/16/2006 1:18:33 AM   
SubMan17


 

Posts: 2
Joined: 8/15/2006
From: , FL, USA
Status: offline 		Good Idea, you may want to try some sort of nuclear powered generator receiver inorder to transmit your data.

(in reply to SubMan17)
       Post #: 2

RE: Long Distance homemade RC Sub - 8/16/2006 1:42:05 AM   
Captain Nemo12



Posts: 785
Joined: 4/26/2004
From: Montreal, QC, CANADA
Status: offline 		Hi,

For what reason would you like to go 25ft for? If it's an RC-sub (scale-like), I don't think you'd be able to see it down that far (unless you're sailing in a pool). If it's more of an ROV that you're looking for, I don't think modern conventional radio equipment can reach down that far either.... However, I've read somewhere about an RC-sub going down to 10m. The owner must have made some crazy customization to his RC equipment!! I'm not an electronic expert but looking at what some people have done with the Walmart subs, increasing transmitter/receiver power might work.

_____________________________

In the works: HL Panzer III, Type VIIb U-boat

(in reply to SubMan17)
       Post #: 3

RE: Long Distance homemade RC Sub - 8/16/2006 1:42:02 PM   
Rufe0>UK



Posts: 21
Joined: 10/29/2005
From: Hull, UNITED KINGDOM
Status: offline 		You would need a 25m Ariel with a small balloon at the top.

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RE: Long Distance homemade RC Sub - 8/17/2006 12:26:44 AM   
Carcharadon


 

Posts: 13
Joined: 8/7/2006
From: Savannah, GA, USA
Status: offline
http://home.comcast.net/~max0007/Julya.wmv


Sub goes deep and far

< Message edited by Carcharadon -- 9/11/2006 11:39:10 PM >

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       Post #: 5

RE: Long Distance homemade RC Sub - 9/8/2006 7:24:00 PM   
e-sailpilot86


 

Posts: 347
Joined: 4/16/2003
From: *, WA, USA
Status: offline 		Get a failsafe on it and just make it go as deep as it can, get a pressure guage to figure out the depth, I dunno, something like that. Now, by long distance do you mean travel, or just depth? If you want to cross the atlantic (lol), you probably dont want any propulsion at all. You'd want to use a water-glider design, but don't expect to be able to control the thing.

That would be interesting you know. Use a submarine to transport R/C gear underwater across the atlantic to save shipping costs? lol, maybe not. But it'd be kinda cool!

I think I'm going to start a new thread on watergliders, seems like a neat idea just as an r/c sub.

(in reply to Carcharadon)
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RE: Long Distance homemade RC Sub - 8/24/2007 1:18:40 AM   
Lesleyra


 

Posts: 2
Joined: 8/24/2007
From: Medway, OH, USA
Status: offline 		I am also working on a 100 drive sub with a Rf video and control for retriving items from a lake near here.
The sub will be appx 4 feet in lenght and have a range of at least 200 feet from operator.

The remote radio relay will allow for the distant ( a small boat with a repeater above the Sub)
Has anyone ever tried a deep dive with any subs?

I have been tring to locate a tube that will support that deth, not easy. has anyone ever made a WTC from reinforce pipe?

Richard

(in reply to SubMan17)
       Post #: 7

RE: Long Distance homemade RC Sub - 8/24/2007 7:32:06 PM   
CrunchyFrog



Posts: 468
Joined: 6/10/2005
From: austin, TX, USA
Status: offline 		You're not going out to the Great Lakes with it, are you? Salt-water reception is measured in inches, not feet...same for water with high mineral content.

If it's 25 feet down at 200 feet away, your signal would have to penetrate about 200 feet of water. Your repeater boat might keep it 25 feet instead of 200...but even so, good luck penetrating 25 feet of water.

Pressure differential (the difference between your 1 atmosphere of pressure inside your sub and the pressure outside) increases by 1 atmosphere (14.7 pounds/square inch) for roughly every 33 feet down. At 0 feet, pressure inside and outside are both 1 atm, no differential...if you're 100 feet down, pressure difference is about 3 atm (45 psi), for 300 feet it's 9 atm (135 psi).

As an example of a material, I think Schedule 40 PVC is built to withstand 150 psi...INTERNAL pressure. No guarantee the external-pressure limit would be the same, though I would expect it to have greater external resistance.

But my PVC sub has only braved the depths to 3 feet


--if you're wondering why...after that dive, power cut out (I had overcharged the batteries and the heat softened the contact spring; I think that's why the power circuit hit its limit and broke)...and the sub was close to the dam. You can guess the rest. Recovered it, though. Surprised to see damage was minor. It's ready to go out again.

< Message edited by CrunchyFrog -- 8/25/2007 8:51:38 PM >

(in reply to Lesleyra)
       Post #: 8

RE: Long Distance homemade RC Sub - 8/24/2007 10:14:43 PM   
Lesleyra


 

Posts: 2
Joined: 8/24/2007
From: Medway, OH, USA
Status: offline 		I am working on a preamp for the subs recevier to help aide in the water loss prblem, I have been told the only Freq I can use is 75 Mhz or 50 Mhz a Ham Permit. The 75 Mhz repeater is no big problem to make up, I am trying to get it to transmit from a water antenna to the sub recevier after the preamp. I want to start with 10 feet and work down from there.
This will be a fresh water sub only, for a lake just a short distantance from my house. I have made a IR illminator for the camera and tested it for a Remote UAV system up to 5 mile away.

(in reply to CrunchyFrog)
       Post #: 9

RE: Long Distance homemade RC Sub - 8/25/2007 6:22:06 AM   
CrunchyFrog



Posts: 468
Joined: 6/10/2005
From: austin, TX, USA
Status: offline 		You could get PVC at many local hardware stores. Clear PVC, though, was worth special-ordering in my experience--for two reasons: 1) if a leak starts, you can tell at a glance--less chance for an undetected leak to short electronics or sit for days corroding parts; 2) some kinds of troubleshooting are really aided by a seethrough vessel--I've spotted disconnected wires and kept an eye on whether my motor was getting out of alignment.

For clear PVC up to 6", I know an online source that sells by the foot : Aquatic Eco-Systems, in Florida.
Aquatic Eco-Systems clear PVC by the foot

I've found out Schedule 40 or Schedule 80 is just a material-thickness rating, though, so pressure rating can vary: A 6" pipe might only be rated for 45 psi, while a 2" pipe of the same diameter but having the same wall thickness might withstand 140 psi. Schedule 80 is thicker than 40.

Aquatic Eco-Systems does sell by the foot but adds a premium if your order is below their limit. On the other hand, McMaster-Carr will sell clear PVC in 4' and 8' lengths and some others, depending which diameter you're buying.

McMaster

--the first item in the upper left hand is "pipe fittings and pipe", next screen "plastic pipe" at the bottom...you just have to drill down through their site.

< Message edited by CrunchyFrog -- 8/25/2007 6:30:22 AM >

(in reply to Lesleyra)
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RE: Long Distance homemade RC Sub - 8/27/2007 4:09:58 PM   
lupy


 

Posts: 119
Joined: 12/26/2002
From: Renton Wa
Status: offline 		If you want video at that depth, the only way to do it is with a wire. 2.4ghx is the same frequency that a microwave uses, and so has almost no penetration in water. 900mhz isn't much better. I know a wire seems like cheating, but it's the only way you will get even close. There are lots of advantages, and it's the way all the pros do it, people with a lot more $$ and time than we have. Also, you will be able to get it back when it floods and tries to go deep.

(in reply to CrunchyFrog)
       Post #: 11

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