Re: [PSUBS-MAILIST] How to trim and ballast bigger boats.

[MerlinSub@t-online.de (Carsten Standfuss)]

Hugo Marrero schrieb:
> 
> Carsten,
> 
> The ballast system in these subs is more complex than the scope of this site
> is, but I'll try to give you a quick explanation.
> 
> There are 8 separate tanks ( In reality each is a single tank divided by a
> wall and with independent valves) located on the sides of the sub. Each tank
> has it's own valve. Each valve actuates 4 tanks in  port /stbd pairs. These
> use a combination of air pressure (calle a pre-charge pressure) and a rotary
> vane pump. There are two pumps connected to 5 HP Brushless DC motors that
> can run the pumps in either direction to fill / drain the tanks. Ballasting
> between dives is done while passengers are being transferred between the
> boat and the sub. There is a table that you must use to determine the
> average amount of water needed for the number of passengers and crew on
> board. This gets you within 200 to 300 lbs of your goal. Once you start your
> dive you have to immediately determine if your ballasting condition and
> adjust it accordingly.
> 
> This system is quite complex as there are pumps, 4" Stailess tubing, Valves,
> pneumatic controls, electronics and instrumentation.
> 
> But that's it in a nutshell, hope this helps...
> 
> Hugo

Why the Gran Canarian pilots use the bottom - if the boat is such
perfect fit with tanks and pumps ?

Carsten




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