The compressor bassed sysytem is very staight forward and requires no fancy electronics.
the compressor is small yet very powerfull and effecient and works on 12 vdc,it is a piston type pump.
Located in the casing and getting its air from the serface via a line to the sail,air is compressed into airbanks and held there till needed on serfacing.
A 12 vdc solinoid valve is opened to release the compressed air into the ballast tank ,but it must go through a restriction or reducing volume valve that is just a small T valve cracked slightly open to allow just a small amount of air in with reduced PSI ,if not the sub would rocket to the serface and damage the tank.
The air banks can be CO2 canisters or smaller Bimba units,but as long as they are big enough to give at least several blows per compresstion and it also depends on the amount of compresstion or psi .Typicly for a sub the size of your should use 60 psi,thats all not much needed.The compresser can handle 300psi and thats just way too much.
The plumbing is very minimal and easy to do with aluminum aircraft tubbing and brass compresstion fittings found at your local hardwaere store ,1/4 inch is good.If you have never flared a tube before its easy with the tools for it.
There is a one way valve that is placed between the compressor and the airbanks to double secure from backflow though it has never happend.
The system works as follows.
Onthe serfaace the compressor is tuned on for lets say 15 secounds with all valves closed so that air can be compressed.
Then a breif open of the serface valve to check that the system is working,real subs do this very same proceedure and when air comes out of the ballast tank the valve is closed.
Continue on serface building up more air for say 15 sec be sure to turn OFF the copressor and open the dive valve ,the ballast tank vent valve opens and water replaces the air coming in from holes drilled in the very bottom of the tank.
Once the sub has submerged to the desired level close the dive valve and run as long as you like.It is not nessesary to blow ballast if yuor going to run at periscope depth but if you feel she might use a bit just flip the switch for a secound and a small blow will make her rise just a bit.
When you want to serface just open the serface valve and she risses and continues to rise to full parrade hight if needed or dock side hight.You may stop the rise at any time.
Pump up the air banks at any time prior to diving ,that is very important as no air is no go.
Vertualy no water or vapor enters the casing while compressing but a drain valve is fitted to the airbanks so that water can be removed.
Maintenace is simple ,oil the compressor ocationaly with compressor oil,and check valves and lines.
There is another solinoid valve in the sail that opens to let air into the caompressor or casing and closes when the compressor is off .
It is wirred to the same circuit.
All the cotrols to the system is simple ,done with microswitches and directly atached to the servos.That way no need for expensive elestronics and the radio is isolated from high voltage.
I have all of the parts necessary for you to build the system am\nd no time its done. Drawings and instuctions are included.
Diagram shows the lay out.
Sample price Compressor is 45.00$
Thank you for your interest.