1/96 Aluminaut Submarine by Scale Model Castings - Page 8 - RC Groups
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Jan 16, 2013, 12:54 AM
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tchalfant's Avatar
This ballast piston is a work in progress, it may work, it may not.
Attached a wire to secure the nut that will travel up and down the thread
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A hole was drilled through the plunger to allow the thread slide through. The tip of the rubber was just punctured to allow the thread to travel.
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Another view
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The body was trimmed in a lathe to fit the syringe tube over the body
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Piston travel being tested.
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Full travel. Next will be a limiter for travel and some water testing.
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Jan 16, 2013, 07:29 PM
George Jure
Hello tchalfant

I have been following your build so far and WOW nice to be able to work with small items like you, steady hands, nerves. Please keep up with the build posts.

Could I bother you for source information? I see you have a tiny ESC, can you tell me the source of it and it`s rated operating specs and price? I have just bought from Rick a Marder and Seehund and need to source electronics for them.

Thank You for Posting and any help you can share.

Jan 16, 2013, 08:25 PM
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tchalfant's Avatar
This is the esc, limited info.
Jan 16, 2013, 08:51 PM
George Jure
Hello again

Thanks for the FAST reply. Can I ask you, is that ESC one Rick suggested or you decided on? Have you had a chance to try it and how does it respond? Also what about a SMALL 75mhz FM receiver, any such thing out there that is affordable?

Thanks Again for your help. Been to the site and eyes are everywhere WOW!

Jan 17, 2013, 12:53 PM
Registered User
tchalfant's Avatar
Yes, Rick did suggest the ESC. I have not fully tested them other than to verify it received the signal and motor spun. From the quick test, at very low throttle it seemed a little jittery, at higher it was smooth. But for $7 US what can I expect?

GWS has a small one
its dimensions are 15x25x8.6mm pretty tiny. Single conversion on the signal.
Sombra Labs Lepton6
dimensions are 15x38 (the third number is not posted, I am not near mine right now so could not be accurate, but I will guess is close to GWS)
I chose this one because of the noise reduction and I have had very good experiences with Sombra Labs products.
Jan 25, 2013, 01:50 AM
Registered User
tchalfant's Avatar
Syringe ballast system is tested and works - NO LEAKS! So I can move on with assembly.
Here is a short video.
Syringe Ballast Piston (0 min 25 sec)
Jan 25, 2013, 02:12 PM
Submarines, etc.
tsenecal's Avatar
i highly recommend sombralabs for the receiver, if it will fit.

i have owned a 4 channel pico GWS, and now have 2 lepton6, 6 sl8, and 2 shadow7s (sl8 predecessor).

the GWS 4 channel receiver is smaller than the lepton6, but is a single conversion radio. in my SWM blueback, it was a very glitchy setup. an added bonus with the sombralabs is the programability of failsafes for all channels using their shadow programmer.

for a complete run-down on what is available from sombralabs:

Jan 26, 2013, 10:12 PM
derk's Avatar
nice work on the ballast system, i need to make one for myself
while i was working on my own, one of the syringe plungers leaked a little so i put it all away. i should try again with some other ones and see how it goes.
Jan 27, 2013, 12:37 AM
Registered User
tchalfant's Avatar
A thing I did is to stop the piston just before it gets all the way to the end. If it goes all the way to the end, the thread leaves the rubber of the piston opening the hole to water. I saw a hint of water in the rubber end, but when I stopped it prior to the thread leaving the rubber end, no water. Maybe I got lucky, time will see and more importantly how the wear and tear is on the rubber tip. The hole that was initially put in was VERY tiny! The thinking is it would be snug against the threads. This is the first one for me, so I may have to build another also to see if I can reproduce this successfully and improve it. One area of improvement is the thread and plunger holder, it is WAY too thick and I can get more volume if I get it thinned down. It is a metric thread (I believe) and tried a 2-56 it seemed to be close in diameter, but did not work. Anyone have any idea what it could be?
Jan 27, 2013, 03:20 PM
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profesorul's Avatar
HI @tchalfant,

Tell me: the piston is moved by a LINEAR SERVO or what?.

Jan 27, 2013, 04:07 PM
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tchalfant's Avatar
Marius, certainly a linear piston is the same concept and might work for this. This was a retractable landing gear that was hacked part and used only the key parts. It is essentially a motor turning a thread, the plunger is pushed and pulled by a nut that is attached to the plunger.
Jan 27, 2013, 06:04 PM
Just wondering about that neat little power source in your ballast system test video!
Looks pretty handy!!

Jan 27, 2013, 08:02 PM
Registered User
tchalfant's Avatar


I have the turnigy tester.
Jan 29, 2013, 09:09 PM
Pretty neat little gadget for checking servos!!
Just ordered one!!

Thanks, buddy!!
Jan 29, 2013, 10:17 PM
Registered User
tchalfant's Avatar
Don't forget to order a 4 AA battery holder or a RX battery pack as a power source, if you do not have one already. I set up two sources one is from a BEC and my LiPo battery pack, the other is the rechargeable AA battery pack in the video. Look forward to your creation!

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