Re: [PSUBS-MAILIST] Soft ballast venting valve

[irox <irox@ix.netcom.com>]

Hi Frank,

I've just looked through my (1990) ABS rules book and I don't
see a reference to the amount of compressed gas carried.  I'm
probably thinking of some other guide, or maybe somebody else's
sub specification.

I'll get in touch about visiting (hopefully soon, I'm so close).

Thanks!
  Ian. 


-----Original Message-----
>From: ShellyDalg@aol.com
>Sent: Jan 5, 2009 8:46 PM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Soft ballast venting valve
>
>Hi Ian. Good to hear from you. Yes, with two scuba tanks inside( 80 cu.ft.  
>each), and one outside (100 cu.ft.) I have enough air to blow the tanks dry 4  
>times while near the surface, but maybe only once while submerged. Of course, 
>if  I blow them while submerged the air expands as I ascend, and so just a 
>small  bubble will expand to fill the tanks as I near the surface.
>     I will have two additional scuba tanks ( 40  cu. ft. each) with 
>regulators attached for emergency escape or reserve air. I  chose the 40's because 
>they are thin enough to exit the sub while they're  strapped on, and should 
>provide plenty of air for breathing while flooding and  exiting the sub.(Hope THAT 
>never happens!) 
>     I don't know what ABS recommends, but a  capacity of 6 blows at depth 
>would require a LOT of air. I wonder if the  recommendation is for the hard trim 
>tanks. That wouldn't be much.
>I have an area on the outside that with a little modification I could  easily 
>attach another tank or two.  
>     My soft ballast tanks are a little larger than the  average K boat, so I 
>can get the hatch up high enough when surfaced. I  calculated about 20-23 
>inches above water at the hatch.
>     I may add ( in the future) a short plexi tower  between the hatch and 
>the ring for extra height and improved visibility. I think  Brent has a ring he 
>got from George Kittredge, and Greg Cottrell said he tried a  thin mock-up 
>piece in his pool and really liked it.
>     I'd enjoy a visit anytime, so if you can, just  call me and I'll be sure 
>to be home. We can make a day of it and have lunch in  Santa Cruz. Give me a 
>call. Frank D.
>**************New year...new news.  Be the first to know what is making 
>headlines. (http://www.aol.com/?ncid=emlcntaolcom00000026)




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