What is a RCAB?

[noney]

I have been reading the "Small World vs D&E WTC" thread and must ask. Just what is an RCAB and/or R-RCAB? How does it work, and how is it different from its equivalent? I am sure some of you are getting tired of these questions, but your answers are of great benefit to me. Thanks.

Gene

[JWLaRue]

Hi Gene,

Here's a link to

Hi Gene,

Here's a link to a good RCABS discussion in the forum:

http://s181686668.onlinehome.us/phpBB2/viewtopic.php5?t=4165

This should be a good start.......

-Jeff

[bigdave]

Hi Gene,
If you click

Hi Gene,
If you click on my banner I have a good explination of the system on my web site. Also check out the links to Dr Art Broder's web site for more excellent info. BD.

[JWLaRue]

Ummm, Dave.....what banner, where?!?

Ummm, Dave.....what banner, where?!?

[bigdave]

I see your point!! http://www.subcommittee.com/forum/icon_lol.gif

I see your point!!
If you do click long enough it does come up!!

Here is a link!! Thanks Jeff!

http://www.frontiernet.net/~bwelch/

[noney]

Oh boy! A bunch of

Oh boy! A bunch of great reading ahead! Thank you, and I will probably be back with more questions.

Gene

[noney]

Okay, here are a couple

Okay, here are a couple of more questions after having read the forum thread and Big Dave's discussion. I noticed that on neither system, R-RCAB nor RCAB were "check valves" indicated on any of the air lines. Perhaps none were indicated to keep the drawings simple, but if there indeed are/is no check valve, it appears the compressor (pump) would have pressure against it at all times, from one side or the other. If this is correct, has this ever been a problem?

Is there any operational advantage of one system (R-RCAB vs RCAB) over the other? BTW, great reading, thanks.

Gene

[petn7]

Okay, here are a couple

Okay, here are a couple of more questions after having read the forum thread and Big Dave's discussion. I noticed that on neither system, R-RCAB nor RCAB were "check valves" indicated on any of the air lines. Perhaps none were indicated to keep the drawings simple, but if there indeed are/is no check valve, it appears the compressor (pump) would have pressure against it at all times, from one side or the other. If this is correct, has this ever been a problem?

Is there any operational advantage of one system (R-RCAB vs RCAB) over the other? BTW, great reading, thanks.

Gene

If I understand your question correctly, the pumps and/or clippard valves hold the pressure, whether it's positive pressure in the pressure vessel or the vacuum in the WTC.

The pumps Big Dave sells seem to hold pressure no problem. I'm using the larger Caswell pumps, and we'll soon see how well they hold pressure, as the smaller Caswell pumps can't hold back pressure.

[noney]

Petn7, you got the question

Petn7, you got the question right and your answer is pretty much what I suspected. Thank you. I now have a pretty good idea what an RCAB and R-RCAB is and how each works. I would still like to know, however, if one is operationally superior to the other, or is it a simple matter of personal preference?

Gene

[bigdave]

The R system is the

The R system is the better of the two systems but takes up the most room in the model as you have to have a separate pressure tank. In the R system no vacuum is built up in the cylinder so it is easier on the seals. Safety is a factor too as the model always has the air to surface in the pressure tank. All it takes is the failsafe to open the valve and refill the bladders. In the RCABS system you have to start the pump to fill the bladders and surface. BD.

[noney]

Thank you David. When you

Thank you David. When you say "cylinder" you are speaking about the WTC, correct? I believe it only makes sense that you are. Will the U47 that I have on order be able to hand the R-RCAB?

Gene

[bigdave]

Hi Gene,
Although I am

Hi Gene,
Although I am not a fan of putting the pressure in the cylinder (WTC) I have read of guys that have done it with the U-47. I like to use a separate tank made for holding that much pressure. Even at 12PSI which is the max for the pumps I sell I have seen end caps contorting trying to bust free of the tube.
It does not give me a warm fuzzy feeling!! BD.

[noney]

The R system is the

The R system is the better of the two systems but takes up the most room in the model as you have to have a separate pressure tank. In the R system no vacuum is built up in the cylinder so it is easier on the seals. Safety is a factor too as the model always has the air to surface in the pressure tank. All it takes is the failsafe to open the valve and refill the bladders. In the RCABS system you have to start the pump to fill the bladders and surface. BD.

Somehow I have gotten myself confused here. So Dave, which one do you recommend I install in my U-47 when the time comes?

Gene

[bigdave]

The version I saw had

The version I saw had an R system installed. As I have never done a conversion like that and am not that familar with the U-47 I can't help you in doing the conversion. All I can say is I have seen it done. My systems are very different in design. BD.