RCABS - Some questions

[adriaticsea]

[color=#000000]Hi everyone,

I'm in the design stage of a WTC for my ThorDesign 1/96 Uss Permit and, after having considered many ballast system, I became interested in dr.Art Broder's RCABS after reading the excellent article in the March 2004 SCR]

[Guest]

Mauro,
1. Child size bladder should

Mauro,
1. Child size bladder should be OK for that volume. Adult bladder will work. You just don't inflate it fully, or place it in an enclosed location, where it is restricted to the volume you need. The pump doesn't have the strength to burst the bladder.
2.If you buy an AUTOMATIC blood pressure monitor from your local pharmacy or discount store, you can take it apart and use the pump from the machine, and the bladder from the arm cuff.
3. I find the Clippard valve too slow, but it works a little better when using two. The tire valve works well, with just momentary activation from the transmitter.
I hope this helps.

[adriaticsea]

Hi dr.Art,

thanks for the reply,

Hi dr.Art,

thanks for the reply, it was my plan to equip my Permit with the version of the RCABS engineered by Dave Welch, so I'll be enclosing the bladder in a lenght of plexiglas tube.
On the Sept. 2004 Issue of the Report there is an interesting article by Dave Welch where he says that, in order to empty a ballast tank section about 4.5"x3"OD he used two child size (4.5"x2.25") bladders in series, so this is probably going to be my setup.
For the pump, I'd like to know if you can tell me the name of some manufacturers, because then I could do a better search on the Internet to find direct sources for the pumps...automatic sfigmomanomenters aren't cheap here (100 euros...about 140 USD!!).
Thanks in advance for the help.
BEST REGARDS MAURO

[Guest]

Mauro,
My manufacturer contact, Oken, only

Mauro,
My manufacturer contact, Oken, only sells to OEM, original equipment manufacturers, not to resellers, so I can't get any more air pumps from them.
If anyone finds a manufacturer who is willing to sell to hobbyists, please let us know!
Art

[anonymous]

Howdy!
I get mine (Oken Seiko

Howdy!
I get mine (Oken Seiko Rolling Pumps) from the following]Pump source[/url]

Chris

[Guest]

Chris,
Do they have other Oken

Chris,
Do they have other Oken pumps besides that 3Volt model? That one only pumps 2/3 of the volume/unit of time, and 2/3 of the pressure of the 6V model that I have had. What is the expected life, MTBF, if you run it at 6V? It is cheap enough to replace it if it burns out too quickly. Thanks for the lead.
What I am looking for is a source for the PO5K-03C model, or something with similar specs.
Art

[anonymous]

Hi Art,
Haven't done extensive testing

Hi Art,
Haven't done extensive testing yet. I gave one to the guys in the lab at work, and they seemed pretty confident I could run it at ~4V (stepped down from 7.2 with just a series of 3 diodes) with no issues. Again, haven't done any inflate/deflate tests yet, still working on getting my WTC together.

I have an extra one kicking around if you want to try it. Let me know and I can drop it off.

Chris

[adriaticsea]

Hi everyone,

dr.Art, Chris, thanks for

Hi everyone,

dr.Art, Chris, thanks for the answers but here in Italy I found the situation to be much more difficult...infact air pumps suitable for the RCABS are virtually unavailable for the end-user and taking apart an automatic sfigmomanometer is not possible at the moment for me.
The RCABS is a very well tought ballast system and my compliments go to dr. Art that figured it out. If in the future I'll find a more viable source for small air pumps, then I'll look again at the RCABS.

BEST REGARDS MAURO

[Guest]

Mauro, and others interested in

Mauro, and others interested in RCABS,
Stay tuned! I think I may have located a less expensive source for the pumps. I will do some testing, and will have a definite answer by next week.

[adriaticsea]

Hi Art,

thanks very much for

Hi Art,

thanks very much for your effort, it is really appreciated!! My interest in the RCABS is always great, and I consider it to be the only alternative to a gas ballast system for my Permit.
Could I ask if you can tell me what is the possible source you located? I could then check availability here in Italy of the source or for international shipping.
Thanks in advance,
BEST REGARDS MAURO

[dietzer]

Mauro,

I sent you an email

Mauro,

I sent you an email regarding pumps a couple of days ago. Did you get it?

My yahoo mail account went down sometime on Wed and didn't come back until Thursday, so it's possible I missed your reply.

Regards,

Carl

[adriaticsea]

Hi Carl,

sorry for the delay

Hi Carl,

sorry for the delay but I checked my e-mail only a hour ago after a long time and found your reply. Thanks very much for the offer, I'm considering it very seriously and will let you know via e-mail (I first have to talk about it with my parents, but I think there will be no problems)
BEST REGARDS MAURO

[Guest]

Good news for RCABS enthusiasts.

Good news for RCABS enthusiasts. RCABS air pumps are now available from a U.S. manufacturer. They are new, current models, and work well for our purposes. They are slightly larger(1/8" diameter and 1/2" overall length) than the unavailable, current Oken model, but they only cost $5.25 each, plus shipping costs. The manufacturer's contact info is]www.smartproducts.com[/url]
The model # is AP-3PO1 It is their 6VDC 460ma @ 300 mmHg Micro air pump.
The pumps should work well in Dave Welch's experimenter's kits, or in your own version of RCABS.
Good luck, and have fun making your own ballast system.
Art

[Guest]

Thanks to Tim Smalley's advice

Thanks to Tim Smalley's advice in another forum, I can now show the picture from my webpage which was mentioned in the above post.
Here is my attempt]http://www.subcommittee.com/forum/ACF7498.JPG[/img]



Edited By Art Broder on 1102435929