Btw, the ballast tank system inspired by this video:
1/120 Akula
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Make it simple, make strong, make it work!Comment
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Mloo123,
Are you using a 7.2v pack?
Windshield washer pumps are usually rated to run 12V, any problems running it at a lower voltage?
Also, as you did not use a blocking servo, any problem with water leaking pass the pump and prematurely flooding the tank when the boat is surfaced?Last edited by redboat219; 05-01-2022, 03:20 AM.Make it simple, make strong, make it work!Comment
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Redboat219, did you actually EVER build a RC submarine? Do you have ANY real experience running such vessel?
Don't get me wrong, iam actually interested in knowing the cause for all those questions. I for myself am rather practical, i build, test and improve and solved most of that basic stuff very early in my first attempts to make a model run.
12v pumps with gears etc will work fine at 7.2v, only pumps that wont i know if are perustaltic pumps with 380' rs motors.
I used a 12v gear pump running at 6v with now problems.
if you put your water intake high int the ballast tank, but the outer end low deep in the water, it wont leak.
I made all kind of tanks exept for gas powered systems.
Regards JörgLast edited by JHapprich; 05-01-2022, 04:08 AM.Comment
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Mloo123,
Are you using a 7.2v pack?
Windshield washer pumps are usually rated to run 12V, any problems running it at a lower voltage?
Also, as you did not use a blocking servo, any problem with water leaking pass the pump and prematurely flooding the tank when the boat is surfaced?
Actually I have thought I might need a solenoid valve or blocking servo to prevent back flow or Intrusion of water, but after noticing that it's not significant maybe due to the surrounding pressure when surface, thus it's not necessary to install one. Unless the ballast tank is pressurized type with a high pressure pump type then a solenoid valve is necessary.
There's another type of pump, a peristaltic type which will solve the back flow problem, but they were much less efficient than a geared pump. I have used them before and didn't like it.
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Re-posting...
Done some tests with my mini water pool...
Periscope depth. Not perfect due to ballast tank not centralized located and bow will pitched down when adding more ballast. Tried add flotation foam at bow but ballast capacity limited to bring lower depths unless add more ballast weight to lowered waterline much more when surfaces... Any tips?
Full dive...
WOT test for full min on shaft seal...
End of trimming test, next checking water leaks on WTC.
Tests results shows battery compartment is bone dry. The main engine/pump room has slight water ingress. Highly suspect from the gland nut seal of main shaft as no signs of water on the lid seal surrounding area of the transparent cover. Need to further address the seal leaks to minimum.
Airplane gyro for the level planes and it functions as it is. Also shown the 12V auto windshield pump running on just 7.2V battery pack.
Thats all for today.
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Question.
Has anyone tried a 2.4ghz radio on rc subs before without any modifications on the antenna? Currently I'm using a spectrum 2.4ghz reciever (short antenna) with additional piggy-back satallite reciever (short antenna) and it seems it penetrates water quite well without any signs of glitches with full controls on every channel. Or is it because I'm not running deep or further distance away enough so it's normal for such radio system to operate?
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You are not running deep enough and in clear water. You will be only able to operate at scope depth with anteann above the waterlevel.
Have you mesured the amps your waterpump draws?
I have some of those, but am reluctant to use install 'em as the specified power consumption by the vendor is rather highComment
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You are not running deep enough and in clear water. You will be only able to operate at scope depth with anteann above the waterlevel.
Have you mesured the amps your waterpump draws?
I have some of those, but am reluctant to use install 'em as the specified power consumption by the vendor is rather high
I didn't measure the current draws on the motor yet. Will do that and report back soon.Comment
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