Mini-WTC by Dave Welch - photos posted

[tmsmalley]

I have posted some photos and a write-up by Dave Welch on the mini-WTCs (2") he builds utilizing Art Broder's RCABS blood pressure cuff ballast system (as seen in the March 04 issue of the SCR).

Go to my website RC-Submarines.com and once you are into the site, click on the photo of the Trumpeter Kilo at the top of the left column.

Enjoy,
Tim






Edited By TMSmalley on 1083006788

[novagator]

Thats http://www.subcommittee.com/forum/icon_cool.gif

BTW what kind

Thats

BTW what kind of glue us used on those kits that are ok for the water?

[tmsmalley]

Regular old model cement.

Regular old model cement.

[torsten]

Great work !
I like small

Great work !
I like small RC'd subs and Dave's Kilo is really nice
What i'd like to know is where to get these blood pressure cuffs....i did not find those in Germany yet.
Are they specially made out of existing cuffs.....look so small ?

My VIIc not yet started and here's another cool new project....lots of work to do

[Guest]

Torsten,
Those are either infant bladders

Torsten,
Those are either infant bladders or micro bladders for wrist blood pressurs cuffs. The bladders are the rubber or thin plastic bags that go inside the cloth cuff that goes around your upper arm or wrist. I use a slightly larger bladder, child size, for up to 60" models. The adult size bladder should only be necessary for subs larger than 60' OAL.
Try http://store.yahoo.com/allheart/welallatneop.html
or http://sales.goldmine-elec.com/prodinfo.asp?prodid=6374
Hope this helps.

[bigdave]

Hi Torsten, Art is right,

Hi Torsten, Art is right, they are called tiny air bladders. I purchased them on-line at www.goldmine-elec.com. They are part # G12342. They must be from infant sized bladders. They work great for these small subs. I use two in my Dumas Akula and my good friend Larry Kuntz uses three in his Akula. I will be using two in my Revell Type V11 WTC also. Thanks for your nice comment, Dave.

[jeffrey j]

Hi BigDave, Question for you,

Hi BigDave, Question for you, I have seen micro-servos, are there micro RX's also? I have never seen mini-recievers before. Could you post a photo of your WTC when its ready for your Revell VII? Many thanks... Jeff J.

[thordesign]

Micro R/C fans. Hold onto

Micro R/C fans. Hold onto your hats. I am going to blow your doors off in about 60 days.

[bigdave]

Hi Jeff, It is hard

Hi Jeff, It is hard enough to find multi channel 75 MHZ receivers let alone find small ones. Everyone stocks 72MHZ. But! I use FMA receivers in my small subs. They have a mini receiver called the M5. It is 5 channels and very small. I use them in my micro helicopters (sorry they are fun to) on 72 MHZ. I noticed the manual said they were available on 75MHZ but they are not on the web site. I talked to Fred Marks at a model show and he told me they can be special ordered on 75. You have to call to order them. I have not ordered any yet and I am using the FMA micro-2000 ones I have now. It is getting very hard to fit it in these small 2 IN WTCs though and I may order a few M5's. Dave.

[scott t]

How is the air blader

How is the air blader emptied? On the pictures of Art's submarine it apears a rubber band is used to deflate the bladder.
In the pictures of your sub I can't see what deflates the bladder. Maybe you pump it out?

[bigdave]

Hi Scott, In a word

Hi Scott, In a word Vacuum. When you suck the air out of the WTC to fill the bladder it creates a vacuum inside. When the ballast servo pushes down on the schrader valve it directs the vacuum to the bladder and sucks it down flat. The system is very fast also. Almost to fast. It is a very simple system and works flawlessly. I really have to thank Art Broder for bringing this system to our attention. The only problem you can have is a vacuum leak. It is very important you have good seals. I use the Subtech seals because they seal better if you create a vacuum inside as they are one way seals. The end caps have standard o-ring seals. I hope this gives you a better idea of how it works. Dave.

[Guest]

Dave (and Scott),
Dave, thanks for

[color=#000000]Dave (and Scott),
Dave, thanks for the kind words and for using the RCABS. The ballast system is simple to build, and lends itself to experimentation and modification.
Scott,
I use the rubber bands to hold the bladder in position, and to be able to slide it, to alter trim, when other changes or additions are made to the model. The rubber bands aid the deflation process, but are not absolutely necessary, because of the vacuum, as Dave points out.
For additional information on the Ballast system, see Messages and Documents onMy Webpage ]

[Larry Kuntz]

Dave, Scott, and Art,
I'm on

Dave, Scott, and Art,
I'm on my first WTC for a Dumas Akula and decided on Art's bladder system. (Dave, thanks for adding me in your message). Just to add a bit of info, the 3 bladders (which Dave kindly ordered for me) take ~ 12 seconds to inflate and ~ 4 seconds to deflate (maybe too fast, but I can restrict that if necessary). So far I'm in the testing stages, meaning I'm diving the WTC by wires instead of RC gear (have the pump, battery and solenoid in the WTC). Wanted to make sure it works well before proceeding. I deflate mine with an electronic solenoid made by Clippard instead of the schrader valve, either works well. Check my website for some photos and text. It's Larry's WTC. I'm have fun just learning to design this stuff.

P.S. If anyone needs to email me, use the email address on my website directly, as we still have a problem with the ikonboard (SubCommittee board) and Frontiernet.



Edited By Larry Kuntz on 1083284185

[tmsmalley]

I added some new photos

I added some new photos and text that Big Dave sent me of his linkages in the Trumpeter Kilo he is installing the WTC into.


RC-Submarines.com

[torsten]

Thanks Art and Dave for

Thanks Art and Dave for sharing your thoughts;that's some really good information.............i'll have to look for acrylic tube in that diameter at my local store

Also i'm curious what's coming up from Matt Thor ! ( i hope the type II project is not cancelled yet )

Torsten