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Author Topic: los angeles class 1/80th scale static diving rc submarine  (Read 27097 times)

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #25 on: May 17, 2012, 10:26:51 pm »

he doesn't have a lawn but his workshop is a tipp so will ask him I'm not sure he trusts me sorting it out though lol %%
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #26 on: May 17, 2012, 11:03:22 pm »

the workshop isnt a tip is organized chaos ! bet alan will know where everything is ?  BATT  i think we both know the answer to your question , its two letter begins n !
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #27 on: May 19, 2012, 11:52:30 pm »

the dive tank works yay      next to fit it to the main board you know the one next to the control board just near the moving thing in the gutter like thing   (Julies Verne is turning in his grave ).  I've scrapped the whol green thingy idea and got my self a  nice two way geared water pump
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #28 on: May 20, 2012, 10:30:14 am »

You will still need a pinch valve to stop back flow through the pump if the tank is sealed. If the tank is vented you don't need a valve, but the boat needs to be trimmed positively buoyant, otherwise you can't empty the tank.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #29 on: May 20, 2012, 12:01:10 pm »

I'm confused so surly if the tank vents then there's no air left to surface
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #30 on: May 20, 2012, 12:47:38 pm »

Yep. You have to drive it to the surface, or let it float up of it's own accord- hence the need for positive buoyancy. If you have a sealed tank, the pump compresses the air as the tank fills with water, but geared pumps leak a bit, so once you stop pumping, you'll find the pressure in the tank gradually pushes the water out through the pump, ruining your trim. That's why you need the valve.

There is a third way, but that involves making a snorkel, which may be a little tricky for you. Keep it simple.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #31 on: May 20, 2012, 02:50:27 pm »

ok I MIT just. use a drive it to the surface well I'm not sure actually I will use a valve but what  tube do I put it on
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #32 on: May 20, 2012, 03:47:38 pm »

Calling Station X for deciphering!

triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #33 on: May 20, 2012, 05:54:55 pm »

BEN  please translate your last post , goble - de -gook wasnt on our language studies when we went to school !
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Mad_Mike

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #34 on: May 20, 2012, 11:08:26 pm »

ok I MIT just. use a drive it to the surface well I'm not sure actually I will use a valve but what  tube do I put it on

this is a funny read and a great build thread, well done ben :-))

ben says:

'' ok i might use the vented tank idea drive the sub to the surface or let it float. well i think i will do it that way. i will use the valve.  what pipe does it go on?

think i got it {:-{
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #35 on: May 21, 2012, 09:04:48 am »

I would be inclined to stick with a pressurized system- you have the parts required to make this work, and it enables you to trim the boat for different water conditions.

Don't know what size tank you've made. I don't have this boat, but L.A class is a low freeboard boat, like all U.S nukes, so at a guess I think you would need about 600-700ml, so overall you would need to volume the tank about 850ml, as this system can only fill about 70-75% of the tank. You should add baffles to the tank to prevent sloshing.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #36 on: May 21, 2012, 09:57:31 am »

there are two baffles in the tank
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #37 on: May 22, 2012, 07:54:00 am »

does it make any difference as to which way the baffels are fitted in the tanks ?
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #38 on: May 22, 2012, 10:16:13 am »

Yes, they should be fitted across the tank- port to starboard. Sloshing affects the boat most acutely along it's length, and the tank longer than it's is wide.

Baffles can be designed in a myriad of ways. The shorter and fatter your tank, the fewer the baffles are required.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #39 on: May 22, 2012, 10:58:00 am »

i put 2 in my one and it seems to stop it i did kinda mess up when i made them outa balsa wish i had used plastic but dont have the tools
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #40 on: May 22, 2012, 11:56:19 am »

balsa if not very well sealed is going to absorb water ! why couldnt you make some in plasticard ?
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Davy1

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #41 on: May 22, 2012, 11:59:16 am »

Yes, Plasticard would be a good choice. From model shops and you can cut it with scissors.

David
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #42 on: May 22, 2012, 01:49:52 pm »

ive bought some circle cutters which are supposed to be good on plastics , not that ive tried them yet , but my old pal up in bristol used to swear by his !
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #43 on: May 22, 2012, 04:00:14 pm »

I don't envy your task trying to put a submarine together without at least some basic hand tools.

At the very minimum you should have access to a coping saw, good quality stanley knife, drills and preferably some sort of power drill, although a hand drill will suffice if you're really stretched. Mission critical items like endcaps, shaft seals etc. can be be purchased off the shelf.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #44 on: May 22, 2012, 10:31:46 pm »

i got a ryobi power multi tool thingy some sand  paper and a scalp
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #45 on: May 22, 2012, 11:35:08 pm »

ben the dremel drum sanders are harder wearing than the ryobi ones , ive recently bought the ryobi tool myself after years of dremel ones !
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #46 on: May 23, 2012, 09:08:36 pm »

The water tight compartment only just fits every thing in it, its a squeeze.  :-) :-)








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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #47 on: May 23, 2012, 09:14:56 pm »

dont see that as a tight squeeze , loads of space under the tray !
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #48 on: May 23, 2012, 09:40:02 pm »

thats where the speed controler rx rx batt failsafes water switch ect ect

the dry fit











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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #49 on: May 23, 2012, 09:43:21 pm »

keen eyes will notice that the ballast tank is high this is so the water tubes can run under aswell as the batt cables obviously this would reduce stabibility but as its the centre of the sub most the waying down ballast will be bellow it so this should keep her upright  :-))
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