[Date Prev][Date Next]
[Chronological]
[Thread]
[Top]
Re: [PSUBS-MAILIST] Self Adjusting Soft Ballast Tanks
Hi Doug,
Will the 3CFM air flow be enough to compensate your cabin, engine compartment,
that all three ballast tanks at the same time? As you said, if the decent is slow enough it will. My question is how slow is slow.
If for example your spaces had a total volume of 36CF and they were half full with air at 33 foot depth. Going down to 66 foot the air would be compressed from 18CF down to:
36CF/2 * 2ATM/3ATM = 12CF
To compensate for that you will have to add:
18CF - 12CF = 6CF
At 3CFM you will have to take:
6CF / 3CFM = 2M
2 minutes to decend 33 feet. If you would ever exceed this decent rate your balast tanks would suffer uncontrollable compression as their air spaces were compressed by the every increasing pressure.
You might want some way to add pressure on demand. Or better in some kind of automated fashion.
The air diverter is an intriguing concept.
The pipe outlets in all the ballast tanks need to be as high as possible. If the water level ever got over the end of any of the pipes water will decend down the pipe into the engine compartment.
Since the bottom of the rear ballast tank is lower the the forward ballast tank's bottom, the rear tank will be under a slightly higer pressure. Will that pressure force the air out of that tank and up to the forward tanks? What if enough air was forced out of the rear ballast tank to let water level get above the pipe, letting water down the pipe? Of course the read air diverter will now let more air into the back heavy submersible. Will a 3CFM air flow be enough to keep up with the air
transfer from the rear to forward ballast tank? Perhaps all three ballast tanks need to be at the same height in the sub.
You might want to mock out a scale model of your design and take to a pool.
Regards,
Ray
DJACKSON99@aol.com wrote:
>
> I would sure appreciate it if you kind sirs would look over what I think will work for ballast tanks on my dry ambient. It's explained with diagrams on my web page. Just select "Self Adjusting Soft Ballast Tanks" from the table of contents. Here is the link: http://jackson.parcabul.com/sub/
>
> I am much obliged,
> Doug Jackson