the drop weight weighs 1300 lbs and slides in between two I beams like a drawer. It is hooked to a hydraulic cylinder that pushes the drop tray to slots cut in the I beam and then falls out the bottom. The cylinder is pressurized from those bottles. The ballast tanks are blown from 8 bottles connected together and valved from inside the sub. You are correct about dive shops not filling them. Thats why I got them free. After 15 years the aluminum bottles are non-refillable. I made my own air compressor out of hydraulic cylinders and check valves.
Sent from my iPad Steve, How are they used for the drop weight? For that matter how do you use them for the ballast tanks? At my local dive shop were not too keen on filling them. Do you run them at 2000 psi?
Brian
On Tue, Apr 10, 2012 at 6:57 PM, Steve Seymour <stsdms79@connectgradd.net> wrote:
yes I have 10 of them on my sub, 2 are used for the drop weight and 8 are used for the ballast tanks. the ones I have are aluminum and they are normally referred to as Scott Air packs.
On Apr 10, 2012, at 7:43 PM, "ojaivalleybeefarm @ dslextreme.com" < ojaivalleybeefarm@dslextreme.com> wrote:
> Hi, A friend of mine gave me 4 steel cylinders that are used by firemen and rescue people. Can't remember the term for these bottles, anyway they apparently are rated for around 2000 psi. Has anyone had occasion to use these type of bottles?
>
> Brian
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