Re: Re[4]: Re: Multiple engines (was RE: Liquox)

On Thu, 2004-06-10 at 11:03, Hans Ulrich Ammann wrote:

> If memory serves there are also Russian examples of single- axis hinged vernier
> engines running on LOX/Kero, where the propellants go through the hinges and
> tightness is achieved by rotary seals.
> A good and inexpensive solution compared to restrained metallic bellows especially
> if it comes to higher pressures.

	Are those kinds of rotary seals an off the shelf item? Metal flexible
hose (essentially bellows restrained by a braid) seems to be a fairly
standard off the shelf item up to at least 2" diameter, and they're good
down to cryo temperatures. 

	-p