Re: Delta 4 - The fix is in

From: Ed Kyle (edkyle99_at_hotmail.com)
Date: 03/18/05 

Date: 17 Mar 2005 18:49:05 -0800

Jim Davis wrote:
> Ed Kyle wrote:
>
> > By contrast, Atlas V CCB tank pressurization is provided by
> > helium bottles and a regulation system that is completely
> > independant of the RD-180 engine.
>
> Does this have anything to do with the RD-180 being a staged
> combustion engine and the RS-68 being a gas generator engine?
>

I don't think so. The SSME's (staged cycle) produce gases that
are used to pressurize the external tank.

> Does the RS-68 have a fuel-rich or oxidizer-rich gas generator? Fuel
> rich is more common but it seems odd to pressurize an LO2 tank with a

> fuel rich exhaust.
>

On RS-68, a Mitsubishi heat exchanger heats up liquid oxygen,
making gaseous oxygen to pressurize the CBC LOX tank.

 - Ed Kyle

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