From: MUNIZB%RWTMS2.decnet@beach.rockwell.com ("RWTMS2::MUNIZB")
Subject: What use is Freedom?
X-Added: Forwarded by Space Digest
Organization: [via International Space University]
Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
Distribution: sci
Date: Thu, 8 Oct 1992 01:45:20 GMT

			"Peace" v. "Freedom"

(Apologies if this information has been posted previously!)

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Comparative capabilities in space
(from Space Station Freedom Program Office, 3/30/91)

	      PMC SSF	Mir	  mid-90's  CSDF     Spacelab  Skylab
	      			  Mir

Pressurized   3 lab	2 lab	  5 lab	    1 lab    1 lab     1 lab
Elements      1 hab	2 hab	  1 hab	    	     	       1 airlock
	      2 logs	1 logs	  1 log	    	     	       1 mult.
	      2 node	1 node	  1 node    	     	       docking
	      1 airlock	1 Soyuz	  1 Soyuz TM	     	       adapter
	      		
Pressurized   26900 	7912*	  14491*    2500     4950      14513 
Volume,ft**3  

Weight,lb     500000	198000	  286000    35307    22000     159200

Power,kW      56.25	25*	  40*	    8.5	     2	       5.7

Permanent     4		2	  2-6	    0	     0	       0
Crew	      			  	    (3 temp) (4 temp)  (3 temp)

Environmental regen H2O	regen H2O regen H2O no regen no regen  no regen
Control	      		partial	  partial
	      		regen O2  regen O2  

Available     11232	4160	  4160 to   396	     672       5364 mh 
Crew Time     			  12480	    	     	       3 mission
man-hr/yr     			  	    	     	       total

PMC SSF: Permanently Manned Capability, Space Station Freedom
MIR: as of 8/90
CDSF: Commercially Developed Space Facility (SSI's free-flyer)
*: U.S. estimated value based on published data
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

I'm not sure if the mid-90's Mir refers to additional modules on the 
current station, or Mir 2 which is scheduled for launch in 1997 (*Space 
News*, Oct. 5-11, 1992, p. 2).

As far as replacing SSF with the current Mir, it must be noted that 
that since Mir is nearing the end of its design lifetime, the current 2 
person crew spends 3/4's of its time doing maintenance, or 1.5 
equivalent crew members (ECM).  This leaves 0.5 ECM for research.  SSF's 
maintenance will also take 1.5 ECM, leaving 2.5 ECM available (ref.: 
Gary Oleson [SSF Engineering Integration Office], *Spacefaring Gazette*, 
December 1991, p. 2)

Using Mir 2 instead of SSF is a different story, altogether.
    {"Using MIR 2 instead of SSF is a different story."  (voice 1)}
    {"Using MIR 2 instead of SSF is a different story."  (voice 2)}
    {"Using MIR 2 instead of SSF is a different story."  (voice 3)}  :-)

As far as size, the PMC SSF has a "wingspan" (dimension perpendicular to 
the velocity and nadir vectors when flying in the Local Vertical Local 
Horizontal [LVLH] mode) of 4253 inches, or about 354.5 feet.  The 
"fuselage length" changes as the starboard and port power modules rotate 
with respect to the center truss (which is fixed relative to the velocity 
and nadir vectors), but the maximum value is 2976 inches, or 248 feet.  
The third dimension does the same, and its maximum is 946 inches, just 
under 79 feet.
  

Ben Muniz, Rocketdyne, SSF Dynamics | "Man will not fly for fifty years"
munizb@rocket.rdyne.rockwell.com    |     Wilbur to Orville Wright, 1901
Disclaimer: Opinions stated are solely my own (unless I change my mind).