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Date: Thu, 21 Sep 1995 14:01:36 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: J Shepherd <jms@fe*.ed*.ac*.uk*>
Cc: techdiver@terra.net
Subject: Re: Why? - Pony Gauges


> 	Whoooaaa! Major brain bend - wrt ambient pressure exceeding
> interstage pressure (c/o Rich P);
> 
> 	Since the first stage is 'balanced' to ambient pressure by its
> diaphragm or piston, why, isn't the interstage pressure 8-12 bar *above
> ambient*?

I was talking about a situation when the tank valve is off, as many folks
seem to prefer on ponies.  If the tank valve is off, but you pressurized
the hoses at sea level, then you will hit the break-even point somewhere
around 250-300 feet, depending on the interstage pressure.

Rich

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